diff --git a/tests/go/advancedsortwordarr_test.go b/tests/go/advancedsortwordarr_test.go
index 0716c9e7..81c4fb3b 100644
--- a/tests/go/advancedsortwordarr_test.go
+++ b/tests/go/advancedsortwordarr_test.go
@@ -32,7 +32,7 @@ func TestAdvancedSortWordArr(t *testing.T) {
 		student.AdvancedSortWordArr(cp_stu, solutions.CompArray)
 
 		if !reflect.DeepEqual(cp_stu, cp_sol) {
-			t.Errorf("%s(%v) == %v instead of %v\n",
+			t.Fatalf("%s(%v) == %v instead of %v\n",
 				"AdvancedSortWordArr",
 				org,
 				cp_stu,
diff --git a/tests/go/btreedeletenode_test.go b/tests/go/btreedeletenode_test.go
index ba60fc7e..2e58513b 100644
--- a/tests/go/btreedeletenode_test.go
+++ b/tests/go/btreedeletenode_test.go
@@ -82,7 +82,7 @@ func formatSubTree_delete(root *student.TreeNode, prefix string) string {
 }
 
 func errorMessage_delete(t *testing.T, fn interface{}, deleted string, rootOr, root *solutions.TreeNode, rootS *student.TreeNode) {
-	t.Errorf("%s(\n%s, %s\n) ==\n%s instead of\n%s\n",
+	t.Fatalf("%s(\n%s, %s\n) ==\n%s instead of\n%s\n",
 		z01.NameOfFunc(fn),
 		solutions.FormatTree(rootOr),
 		deleted,
diff --git a/tests/go/btreeinsertdata_test.go b/tests/go/btreeinsertdata_test.go
index f97f261d..3d786f61 100644
--- a/tests/go/btreeinsertdata_test.go
+++ b/tests/go/btreeinsertdata_test.go
@@ -82,7 +82,7 @@ func formatSubTree_insert(root *student.TreeNode, prefix string) string {
 }
 
 func errorMessage_insert(t *testing.T, fn interface{}, inserted string, root *solutions.TreeNode, rootS *student.TreeNode) {
-	t.Errorf("%s(\n%s, %s\n) ==\n%s instead of\n%s\n",
+	t.Fatalf("%s(\n%s, %s\n) ==\n%s instead of\n%s\n",
 		z01.NameOfFunc(fn),
 		solutions.FormatTree(root),
 		inserted,
diff --git a/tests/go/btreeisbinary_test.go b/tests/go/btreeisbinary_test.go
index 66cee7fe..c9cce3d0 100644
--- a/tests/go/btreeisbinary_test.go
+++ b/tests/go/btreeisbinary_test.go
@@ -19,7 +19,7 @@ func BTreeMinStu(root *student.TreeNode) *student.TreeNode {
 }
 
 func errorMessage_isbin(t *testing.T, fn interface{}, root, a *solutions.TreeNode, b *student.TreeNode) {
-	t.Errorf("%s(\n%s\n) == %s instead of %s\n",
+	t.Fatalf("%s(\n%s\n) == %s instead of %s\n",
 		z01.NameOfFunc(fn),
 		solutions.FormatTree(root),
 		b.Data,
@@ -29,7 +29,7 @@ func errorMessage_isbin(t *testing.T, fn interface{}, root, a *solutions.TreeNod
 
 func CompareNode_isbin(t *testing.T, fn interface{}, arg1, a *solutions.TreeNode, b *student.TreeNode) {
 	if a == nil || b == nil {
-		t.Errorf("Expected %v instead of %v\n", a, b)
+		t.Fatalf("Expected %v instead of %v\n", a, b)
 		return
 	}
 
@@ -40,28 +40,28 @@ func CompareNode_isbin(t *testing.T, fn interface{}, arg1, a *solutions.TreeNode
 	if a.Parent != nil && b.Parent != nil {
 		if a.Parent.Data != b.Parent.Data {
 			errorMessage_isbin(t, fn, arg1, a, b)
-			t.Errorf("Expected parent value %v instead of %v\n", a.Parent.Data, b.Parent.Data)
+			t.Fatalf("Expected parent value %v instead of %v\n", a.Parent.Data, b.Parent.Data)
 		}
 	} else if (a.Parent == nil && b.Parent != nil) || (a.Parent != nil && b.Parent == nil) {
-		t.Errorf("Expected parent value %v instead of %v\n", a.Parent, b.Parent)
+		t.Fatalf("Expected parent value %v instead of %v\n", a.Parent, b.Parent)
 	}
 
 	if a.Right != nil && b.Right != nil {
 		if a.Right.Data != b.Right.Data {
 			errorMessage_isbin(t, fn, arg1, a, b)
-			t.Errorf("Expected right child value %v instead of %v\n", a.Right.Data, b.Right.Data)
+			t.Fatalf("Expected right child value %v instead of %v\n", a.Right.Data, b.Right.Data)
 		}
 	} else if (a.Right == nil && b.Right != nil) || (a.Right != nil && b.Right == nil) {
-		t.Errorf("Expected right child value %v instead of %v\n", a.Right, b.Right)
+		t.Fatalf("Expected right child value %v instead of %v\n", a.Right, b.Right)
 	}
 
 	if a.Left != nil && b.Left != nil {
 		if a.Left.Data != b.Left.Data {
 			errorMessage_isbin(t, fn, arg1, a, b)
-			t.Errorf("Expected left child value %v instead of %v\n", a.Left, b.Left)
+			t.Fatalf("Expected left child value %v instead of %v\n", a.Left, b.Left)
 		}
 	} else if (a.Left == nil && b.Left != nil) || (a.Left != nil && b.Left == nil) {
-		t.Errorf("Expected left child value %v instead of %v\n", a, b)
+		t.Fatalf("Expected left child value %v instead of %v\n", a, b)
 	}
 }
 
@@ -78,7 +78,7 @@ func CompareReturn_isbin(t *testing.T, fn1, fn2 interface{}, arg1 *solutions.Tre
 			CompareNode_isbin(t, fn1, arg1, str, out2.Results[i].(*student.TreeNode))
 		default:
 			if !reflect.DeepEqual(str, out2.Results[i]) {
-				t.Errorf("%s(\n%s) == %s instead of %s\n",
+				t.Fatalf("%s(\n%s) == %s instead of %s\n",
 					z01.NameOfFunc(fn1),
 					solutions.FormatTree(arg1),
 					z01.Format(out2.Results...),
diff --git a/tests/go/btreelevelcount_test.go b/tests/go/btreelevelcount_test.go
index 82a3177a..d8b794cb 100644
--- a/tests/go/btreelevelcount_test.go
+++ b/tests/go/btreelevelcount_test.go
@@ -11,7 +11,7 @@ import (
 )
 
 func errorMessage_level(t *testing.T, fn interface{}, root, a *solutions.TreeNode, b *student.TreeNode) {
-	t.Errorf("%s(\n%s\n) == %s instead of %s\n",
+	t.Fatalf("%s(\n%s\n) == %s instead of %s\n",
 		z01.NameOfFunc(fn),
 		solutions.FormatTree(root),
 		b.Data,
@@ -21,7 +21,7 @@ func errorMessage_level(t *testing.T, fn interface{}, root, a *solutions.TreeNod
 
 func CompareNode_level(t *testing.T, fn interface{}, arg1, a *solutions.TreeNode, b *student.TreeNode) {
 	if a == nil || b == nil {
-		t.Errorf("Expected %v instead of %v\n", a, b)
+		t.Fatalf("Expected %v instead of %v\n", a, b)
 		return
 	}
 
@@ -32,28 +32,28 @@ func CompareNode_level(t *testing.T, fn interface{}, arg1, a *solutions.TreeNode
 	if a.Parent != nil && b.Parent != nil {
 		if a.Parent.Data != b.Parent.Data {
 			errorMessage_level(t, fn, arg1, a, b)
-			t.Errorf("Expected parent value %v instead of %v\n", a.Parent.Data, b.Parent.Data)
+			t.Fatalf("Expected parent value %v instead of %v\n", a.Parent.Data, b.Parent.Data)
 		}
 	} else if (a.Parent == nil && b.Parent != nil) || (a.Parent != nil && b.Parent == nil) {
-		t.Errorf("Expected parent value %v instead of %v\n", a.Parent, b.Parent)
+		t.Fatalf("Expected parent value %v instead of %v\n", a.Parent, b.Parent)
 	}
 
 	if a.Right != nil && b.Right != nil {
 		if a.Right.Data != b.Right.Data {
 			errorMessage_level(t, fn, arg1, a, b)
-			t.Errorf("Expected right child value %v instead of %v\n", a.Right.Data, b.Right.Data)
+			t.Fatalf("Expected right child value %v instead of %v\n", a.Right.Data, b.Right.Data)
 		}
 	} else if (a.Right == nil && b.Right != nil) || (a.Right != nil && b.Right == nil) {
-		t.Errorf("Expected right child value %v instead of %v\n", a.Right, b.Right)
+		t.Fatalf("Expected right child value %v instead of %v\n", a.Right, b.Right)
 	}
 
 	if a.Left != nil && b.Left != nil {
 		if a.Left.Data != b.Left.Data {
 			errorMessage_level(t, fn, arg1, a, b)
-			t.Errorf("Expected left child value %v instead of %v\n", a.Left, b.Left)
+			t.Fatalf("Expected left child value %v instead of %v\n", a.Left, b.Left)
 		}
 	} else if (a.Left == nil && b.Left != nil) || (a.Left != nil && b.Left == nil) {
-		t.Errorf("Expected left child value %v instead of %v\n", a, b)
+		t.Fatalf("Expected left child value %v instead of %v\n", a, b)
 	}
 }
 
@@ -70,7 +70,7 @@ func CompareReturn_level(t *testing.T, fn1, fn2 interface{}, arg1 *solutions.Tre
 			CompareNode_level(t, fn1, arg1, str, out2.Results[i].(*student.TreeNode))
 		default:
 			if !reflect.DeepEqual(str, out2.Results[i]) {
-				t.Errorf("%s(\n%s) == %s instead of %s\n",
+				t.Fatalf("%s(\n%s) == %s instead of %s\n",
 					z01.NameOfFunc(fn1),
 					solutions.FormatTree(arg1),
 					z01.Format(out2.Results...),
diff --git a/tests/go/btreemax_test.go b/tests/go/btreemax_test.go
index 5382921d..0622c935 100644
--- a/tests/go/btreemax_test.go
+++ b/tests/go/btreemax_test.go
@@ -11,7 +11,7 @@ import (
 )
 
 func errorMessage_max(t *testing.T, fn interface{}, root, a *solutions.TreeNode, b *student.TreeNode) {
-	t.Errorf("%s(\n%s) == %s instead of %s\n",
+	t.Fatalf("%s(\n%s) == %s instead of %s\n",
 		z01.NameOfFunc(fn),
 		solutions.FormatTree(root),
 		b.Data,
@@ -21,7 +21,7 @@ func errorMessage_max(t *testing.T, fn interface{}, root, a *solutions.TreeNode,
 
 func CompareNode_max(t *testing.T, fn interface{}, arg1, a *solutions.TreeNode, b *student.TreeNode) {
 	if a == nil || b == nil {
-		t.Errorf("Expected %v instead of %v\n", a, b)
+		t.Fatalf("Expected %v instead of %v\n", a, b)
 		return
 	}
 
@@ -32,28 +32,28 @@ func CompareNode_max(t *testing.T, fn interface{}, arg1, a *solutions.TreeNode,
 	if a.Parent != nil && b.Parent != nil {
 		if a.Parent.Data != b.Parent.Data {
 			errorMessage_max(t, fn, arg1, a, b)
-			t.Errorf("Expected parent value %v instead of %v\n", a.Parent.Data, b.Parent.Data)
+			t.Fatalf("Expected parent value %v instead of %v\n", a.Parent.Data, b.Parent.Data)
 		}
 	} else if (a.Parent == nil && b.Parent != nil) || (a.Parent != nil && b.Parent == nil) {
-		t.Errorf("Expected parent value %v instead of %v\n", a.Parent, b.Parent)
+		t.Fatalf("Expected parent value %v instead of %v\n", a.Parent, b.Parent)
 	}
 
 	if a.Right != nil && b.Right != nil {
 		if a.Right.Data != b.Right.Data {
 			errorMessage_max(t, fn, arg1, a, b)
-			t.Errorf("Expected right child value %v instead of %v\n", a.Right.Data, b.Right.Data)
+			t.Fatalf("Expected right child value %v instead of %v\n", a.Right.Data, b.Right.Data)
 		}
 	} else if (a.Right == nil && b.Right != nil) || (a.Right != nil && b.Right == nil) {
-		t.Errorf("Expected right child value %v instead of %v\n", a.Right, b.Right)
+		t.Fatalf("Expected right child value %v instead of %v\n", a.Right, b.Right)
 	}
 
 	if a.Left != nil && b.Left != nil {
 		if a.Left.Data != b.Left.Data {
 			errorMessage_max(t, fn, arg1, a, b)
-			t.Errorf("Expected left child value %v instead of %v\n", a.Left, b.Left)
+			t.Fatalf("Expected left child value %v instead of %v\n", a.Left, b.Left)
 		}
 	} else if (a.Left == nil && b.Left != nil) || (a.Left != nil && b.Left == nil) {
-		t.Errorf("Expected left child value %v instead of %v\n", a, b)
+		t.Fatalf("Expected left child value %v instead of %v\n", a, b)
 	}
 }
 
@@ -70,7 +70,7 @@ func CompareReturn_max(t *testing.T, fn1, fn2 interface{}, arg1 *solutions.TreeN
 			CompareNode_max(t, fn1, arg1, str, out2.Results[i].(*student.TreeNode))
 		default:
 			if !reflect.DeepEqual(str, out2.Results[i]) {
-				t.Errorf("%s(\n%s) == %s instead of\n %s\n",
+				t.Fatalf("%s(\n%s) == %s instead of\n %s\n",
 					z01.NameOfFunc(fn1),
 					solutions.FormatTree(arg1),
 					z01.Format(out2.Results...),
diff --git a/tests/go/btreemin_test.go b/tests/go/btreemin_test.go
index e4f97c57..1478c77c 100644
--- a/tests/go/btreemin_test.go
+++ b/tests/go/btreemin_test.go
@@ -11,7 +11,7 @@ import (
 )
 
 func errorMessage_min(t *testing.T, fn interface{}, root, a *solutions.TreeNode, b *student.TreeNode) {
-	t.Errorf("%s(\n%s) == %s instead of %s\n",
+	t.Fatalf("%s(\n%s) == %s instead of %s\n",
 		z01.NameOfFunc(fn),
 		solutions.FormatTree(root),
 		b.Data,
@@ -21,7 +21,7 @@ func errorMessage_min(t *testing.T, fn interface{}, root, a *solutions.TreeNode,
 
 func CompareNode_min(t *testing.T, fn interface{}, arg1, a *solutions.TreeNode, b *student.TreeNode) {
 	if a == nil || b == nil {
-		t.Errorf("Expected %v instead of %v\n", a, b)
+		t.Fatalf("Expected %v instead of %v\n", a, b)
 		return
 	}
 
@@ -32,28 +32,28 @@ func CompareNode_min(t *testing.T, fn interface{}, arg1, a *solutions.TreeNode,
 	if a.Parent != nil && b.Parent != nil {
 		if a.Parent.Data != b.Parent.Data {
 			errorMessage_min(t, fn, arg1, a, b)
-			t.Errorf("Expected parent value %v instead of %v\n", a.Parent.Data, b.Parent.Data)
+			t.Fatalf("Expected parent value %v instead of %v\n", a.Parent.Data, b.Parent.Data)
 		}
 	} else if (a.Parent == nil && b.Parent != nil) || (a.Parent != nil && b.Parent == nil) {
-		t.Errorf("Expected parent value %v instead of %v\n", a.Parent, b.Parent)
+		t.Fatalf("Expected parent value %v instead of %v\n", a.Parent, b.Parent)
 	}
 
 	if a.Right != nil && b.Right != nil {
 		if a.Right.Data != b.Right.Data {
 			errorMessage_min(t, fn, arg1, a, b)
-			t.Errorf("Expected right child value %v instead of %v\n", a.Right.Data, b.Right.Data)
+			t.Fatalf("Expected right child value %v instead of %v\n", a.Right.Data, b.Right.Data)
 		}
 	} else if (a.Right == nil && b.Right != nil) || (a.Right != nil && b.Right == nil) {
-		t.Errorf("Expected right child value %v instead of %v\n", a.Right, b.Right)
+		t.Fatalf("Expected right child value %v instead of %v\n", a.Right, b.Right)
 	}
 
 	if a.Left != nil && b.Left != nil {
 		if a.Left.Data != b.Left.Data {
 			errorMessage_min(t, fn, arg1, a, b)
-			t.Errorf("Expected left child value %v instead of %v\n", a.Left, b.Left)
+			t.Fatalf("Expected left child value %v instead of %v\n", a.Left, b.Left)
 		}
 	} else if (a.Left == nil && b.Left != nil) || (a.Left != nil && b.Left == nil) {
-		t.Errorf("Expected left child value %v instead of %v\n", a, b)
+		t.Fatalf("Expected left child value %v instead of %v\n", a, b)
 	}
 }
 
@@ -70,7 +70,7 @@ func CompareReturn_min(t *testing.T, fn1, fn2, arg1, arg2 interface{}) {
 			CompareNode_min(t, fn1, arg1.(*solutions.TreeNode), str, out2.Results[i].(*student.TreeNode))
 		default:
 			if !reflect.DeepEqual(str, out2.Results[i]) {
-				t.Errorf("%s(%s) == %s instead of %s\n",
+				t.Fatalf("%s(%s) == %s instead of %s\n",
 					z01.NameOfFunc(fn1),
 					z01.Format(arg1),
 					z01.Format(out2.Results...),
diff --git a/tests/go/btreerotateleft_test.go b/tests/go/btreerotateleft_test.go
index ae145654..983fb301 100644
--- a/tests/go/btreerotateleft_test.go
+++ b/tests/go/btreerotateleft_test.go
@@ -83,7 +83,7 @@ func formatSubTree_rotleft(root *student.TreeNode, prefix string) string {
 }
 
 func errorMessage_rotleft(t *testing.T, fn interface{}, rootOr, root *solutions.TreeNode, rootS *student.TreeNode) {
-	t.Errorf("%s(\n%s\n)\n == \n%s instead of \n%s\n",
+	t.Fatalf("%s(\n%s\n)\n == \n%s instead of \n%s\n",
 		z01.NameOfFunc(fn),
 		solutions.FormatTree(rootOr),
 		FormatTree_rotleft(rootS),
@@ -96,7 +96,7 @@ func CompareTreesRotLeft(t *testing.T, fn interface{}, root, rootA *solutions.Tr
 	parentStu := parentListRotLeft(rootAS)
 	solTree := solutions.FormatTree(root)
 	if parentSol != parentStu {
-		t.Errorf("Tree:\n%s\nExpected\n%s instead of\n%s\n", solTree, parentSol, parentStu)
+		t.Fatalf("Tree:\n%s\nExpected\n%s instead of\n%s\n", solTree, parentSol, parentStu)
 	}
 }
 
@@ -122,7 +122,7 @@ func CompareReturn_rotleft(t *testing.T, fn1, fn2, rootOr, arg1, arg2 interface{
 			CompareNode_rotleft(t, fn1, rootOr.(*solutions.TreeNode), str, out2.Results[i].(*student.TreeNode))
 		default:
 			if !reflect.DeepEqual(str, out2.Results[i]) {
-				t.Errorf("%s(%s) == %s instead of %s\n",
+				t.Fatalf("%s(%s) == %s instead of %s\n",
 					z01.NameOfFunc(fn1),
 					z01.Format(arg1),
 					z01.Format(out2.Results...),
diff --git a/tests/go/btreerotateright_test.go b/tests/go/btreerotateright_test.go
index f611bbe6..74f241c7 100644
--- a/tests/go/btreerotateright_test.go
+++ b/tests/go/btreerotateright_test.go
@@ -33,7 +33,7 @@ func CompareTreesRotRight(t *testing.T, fn interface{}, root, rootA *solutions.T
 	parentStu := parentListRotRight(rootAS)
 	solTree := solutions.FormatTree(root)
 	if parentSol != parentStu {
-		t.Errorf("Tree:\n%s\nExpected\n%s instead of\n%s\n", solTree, parentSol, parentStu)
+		t.Fatalf("Tree:\n%s\nExpected\n%s instead of\n%s\n", solTree, parentSol, parentStu)
 	}
 }
 
@@ -92,7 +92,7 @@ func formatSubTree_rotright(root *student.TreeNode, prefix string) string {
 }
 
 func errorMessage_rotright(t *testing.T, fn interface{}, rootOr, root *solutions.TreeNode, rootS *student.TreeNode) {
-	t.Errorf("%s(\n%s\n)\n == \n%s instead of \n%s\n",
+	t.Fatalf("%s(\n%s\n)\n == \n%s instead of \n%s\n",
 		z01.NameOfFunc(fn),
 		solutions.FormatTree(rootOr),
 		FormatTree_rotright(rootS),
@@ -122,7 +122,7 @@ func CompareReturn_rotright(t *testing.T, fn1, fn2, rootOr, arg1, arg2 interface
 			CompareNode_rotright(t, fn1, rootOr.(*solutions.TreeNode), str, out2.Results[i].(*student.TreeNode))
 		default:
 			if !reflect.DeepEqual(str, out2.Results[i]) {
-				t.Errorf("%s(%s) == %s instead of %s\n",
+				t.Fatalf("%s(%s) == %s instead of %s\n",
 					z01.NameOfFunc(fn1),
 					z01.Format(arg1),
 					z01.Format(out2.Results...),
diff --git a/tests/go/btreesearchitem_test.go b/tests/go/btreesearchitem_test.go
index 3f9836c6..44136127 100644
--- a/tests/go/btreesearchitem_test.go
+++ b/tests/go/btreesearchitem_test.go
@@ -13,7 +13,7 @@ import (
 
 func errorMessage_search(t *testing.T, fn interface{}, root, a *solutions.TreeNode, b *student.TreeNode,
 	seaVal string) {
-	t.Errorf("%s(\n%s\n, %s) == %s instead of %s\n",
+	t.Fatalf("%s(\n%s\n, %s) == %s instead of %s\n",
 		z01.NameOfFunc(fn),
 		solutions.FormatTree(root),
 		seaVal,
@@ -30,7 +30,7 @@ func CompareNode_search(t *testing.T, fn interface{}, arg1, a *solutions.TreeNod
 	}
 
 	if (a == nil && b != nil) || (b == nil && a != nil) {
-		t.Errorf("Expected %v instead of %v\n", a, b)
+		t.Fatalf("Expected %v instead of %v\n", a, b)
 		return
 	}
 
@@ -41,31 +41,31 @@ func CompareNode_search(t *testing.T, fn interface{}, arg1, a *solutions.TreeNod
 	if a.Parent != nil && b.Parent != nil {
 		if a.Parent.Data != b.Parent.Data {
 			errorMessage_search(t, fn, arg1, a, b, seaVal)
-			t.Errorf("Expected parent value %v instead of %v\n", a.Parent.Data, b.Parent.Data)
+			t.Fatalf("Expected parent value %v instead of %v\n", a.Parent.Data, b.Parent.Data)
 			fmt.Println("Parent.Data", a.Parent.Data, b.Parent.Data)
 		}
 	} else if (a.Parent == nil && b.Parent != nil) || (a.Parent != nil && b.Parent == nil) {
-		t.Errorf("Expected parent value %v instead of %v\n", a.Parent, b.Parent)
+		t.Fatalf("Expected parent value %v instead of %v\n", a.Parent, b.Parent)
 	}
 
 	if a.Right != nil && b.Right != nil {
 		if a.Right.Data != b.Right.Data {
 			errorMessage_search(t, fn, arg1, a, b, seaVal)
-			t.Errorf("Expected right child value %v instead of %v\n", a.Right.Data, b.Right.Data)
+			t.Fatalf("Expected right child value %v instead of %v\n", a.Right.Data, b.Right.Data)
 			fmt.Println("Right.Data", a.Right.Data, b.Right.Data)
 		}
 	} else if (a.Right == nil && b.Right != nil) || (a.Right != nil && b.Right == nil) {
-		t.Errorf("Expected right child value %v instead of %v\n", a.Right, b.Right)
+		t.Fatalf("Expected right child value %v instead of %v\n", a.Right, b.Right)
 	}
 
 	if a.Left != nil && b.Left != nil {
 		if a.Left.Data != b.Left.Data {
 			errorMessage_search(t, fn, arg1, a, b, seaVal)
-			t.Errorf("Expected left child value %v instead of %v\n", a.Left, b.Left)
+			t.Fatalf("Expected left child value %v instead of %v\n", a.Left, b.Left)
 			fmt.Println("Left.Data", a.Left.Data, b.Left.Data)
 		}
 	} else if (a.Left == nil && b.Left != nil) || (a.Left != nil && b.Left == nil) {
-		t.Errorf("Expected left child value %v instead of %v\n", a, b)
+		t.Fatalf("Expected left child value %v instead of %v\n", a, b)
 	}
 }
 
diff --git a/tests/go/btreetransplant_test.go b/tests/go/btreetransplant_test.go
index 7f2b8671..c9cecab6 100644
--- a/tests/go/btreetransplant_test.go
+++ b/tests/go/btreetransplant_test.go
@@ -84,7 +84,7 @@ func formatSubTree_transp(root *student.TreeNode, prefix string) string {
 }
 
 func errorMessage_transp(t *testing.T, fn interface{}, root, sel, repl *solutions.TreeNode, rootA *solutions.TreeNode, rootAS *student.TreeNode) {
-	t.Errorf("%s(\nRoot:\n %s, Selected:\n%s, Replacement:\n%s\n) ==\n%s instead of\n%s\n",
+	t.Fatalf("%s(\nRoot:\n %s, Selected:\n%s, Replacement:\n%s\n) ==\n%s instead of\n%s\n",
 		z01.NameOfFunc(fn),
 		solutions.FormatTree(root),
 		solutions.FormatTree(sel),
@@ -106,7 +106,7 @@ func CompareTrees_transp(t *testing.T, fn interface{}, root, sel, repl *solution
 
 	if parentSol != parentStu {
 		fmt.Println("Tree:\n", solTree)
-		t.Errorf("Expected\n%s instead of\n%s\n", parentSol, parentStu)
+		t.Fatalf("Expected\n%s instead of\n%s\n", parentSol, parentStu)
 	}
 }
 
diff --git a/tests/go/cat_test.go b/tests/go/cat_test.go
index b2292123..05192a1e 100644
--- a/tests/go/cat_test.go
+++ b/tests/go/cat_test.go
@@ -50,7 +50,7 @@ func TestCat(t *testing.T) {
 	pwd, err := os.Getwd()
 
 	if err != nil {
-		t.Errorf(err.Error())
+		t.Fatalf(err.Error())
 	}
 
 	for i := 0; i < 2; i++ {
@@ -61,7 +61,7 @@ func TestCat(t *testing.T) {
 		studentResult := execStdin(cmdS, randStdin)
 
 		if solutionResult != studentResult {
-			t.Errorf("./cat prints %s instead of %s\n", studentResult, solutionResult)
+			t.Fatalf("./cat prints %s instead of %s\n", studentResult, solutionResult)
 		}
 	}
 	execC("rm", "cat_student", "cat_solution")
diff --git a/tests/go/compact_test.go b/tests/go/compact_test.go
index 39092573..1c90959c 100644
--- a/tests/go/compact_test.go
+++ b/tests/go/compact_test.go
@@ -41,14 +41,14 @@ func TestCompact(t *testing.T) {
 		stu_size := student.Compact(&sli_stu)
 
 		if !reflect.DeepEqual(sli_stu, sli_sol) {
-			t.Errorf("Produced slice: %v, instead of %v\n",
+			t.Fatalf("Produced slice: %v, instead of %v\n",
 				sli_stu,
 				sli_sol,
 			)
 		}
 
 		if sol_size != stu_size {
-			t.Errorf("%s(%v) == %v instead of %v\n",
+			t.Fatalf("%s(%v) == %v instead of %v\n",
 				"Compact",
 				v,
 				sli_stu,
diff --git a/tests/go/createelem_test.go b/tests/go/createelem_test.go
index 7e6fb656..4e630046 100644
--- a/tests/go/createelem_test.go
+++ b/tests/go/createelem_test.go
@@ -44,7 +44,7 @@ func TestCreateElem(t *testing.T) {
 		}
 
 		if n.Data != n1.Data {
-			t.Errorf("CreateElem == %d instead of %d\n", n, n1)
+			t.Fatalf("CreateElem == %d instead of %d\n", n, n1)
 		}
 	}
 }
diff --git a/tests/go/divmod_test.go b/tests/go/divmod_test.go
index dbc1bf8f..23887369 100644
--- a/tests/go/divmod_test.go
+++ b/tests/go/divmod_test.go
@@ -17,10 +17,10 @@ func TestDivMod(t *testing.T) {
 		var mod int
 		student.DivMod(a, b, &div, &mod)
 		if div != a/b {
-			t.Errorf("DivMod(%d, %d, &div, &mod), div == %d instead of %d", a, b, div, a/b)
+			t.Fatalf("DivMod(%d, %d, &div, &mod), div == %d instead of %d", a, b, div, a/b)
 		}
 		if mod != a%b {
-			t.Errorf("DivMod(%d, %d, &div, &mod), mod == %d instead of %d", a, b, mod, a%b)
+			t.Fatalf("DivMod(%d, %d, &div, &mod), mod == %d instead of %d", a, b, mod, a%b)
 		}
 		i++
 	}
diff --git a/tests/go/enigma_test.go b/tests/go/enigma_test.go
index 8c192b53..a285a50f 100644
--- a/tests/go/enigma_test.go
+++ b/tests/go/enigma_test.go
@@ -45,25 +45,25 @@ func TestEnigma(t *testing.T) {
 	solutions.Decript(a, b, c, d)
 
 	if aval != ***a {
-		t.Errorf("Expected ***a = %d instead of %d\n",
+		t.Fatalf("Expected ***a = %d instead of %d\n",
 			aval,
 			***a,
 		)
 	}
 	if bval != *b {
-		t.Errorf("Expected *b = %d instead of %d\n",
+		t.Fatalf("Expected *b = %d instead of %d\n",
 			bval,
 			*b,
 		)
 	}
 	if cval != *******c {
-		t.Errorf("Expected *******c = %d instead of %d\n",
+		t.Fatalf("Expected *******c = %d instead of %d\n",
 			cval,
 			*******c,
 		)
 	}
 	if dval != ****d {
-		t.Errorf("Expected ****d = %d instead of %d\n",
+		t.Fatalf("Expected ****d = %d instead of %d\n",
 			dval,
 			****d,
 		)
diff --git a/tests/go/listat_test.go b/tests/go/listat_test.go
index 71deab3a..d502be77 100644
--- a/tests/go/listat_test.go
+++ b/tests/go/listat_test.go
@@ -42,10 +42,10 @@ func nodePushBackList5(l *Node5, l1 *NodeS5, data interface{}) (*Node5, *NodeS5)
 func comparFuncNode5(solutionList *NodeS5, l *Node5, l1 *NodeS5, t *testing.T, arg int) {
 	if l == nil && l1 == nil {
 	} else if l != nil && l1 == nil {
-		t.Errorf("\nListAt(%s, %d) == %v instead of %v\n\n",
+		t.Fatalf("\nListAt(%s, %d) == %v instead of %v\n\n",
 			solution.ListToString(solutionList), arg, l, l1)
 	} else if l.Data != l1.Data {
-		t.Errorf("\nListAt(%s, %d) == %v instead of %v\n\n",
+		t.Fatalf("\nListAt(%s, %d) == %v instead of %v\n\n",
 			solution.ListToString(solutionList), arg, l.Data, l1.Data)
 	}
 }
diff --git a/tests/go/listclear_test.go b/tests/go/listclear_test.go
index b0171cd3..39f78d3b 100644
--- a/tests/go/listclear_test.go
+++ b/tests/go/listclear_test.go
@@ -77,7 +77,7 @@ func TestListClear(t *testing.T) {
 		student.ListClear(link2)
 
 		if link2.Head != nil {
-			t.Errorf("\nstudent list:%s\nlist:%s\n\nListClear() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent list:%s\nlist:%s\n\nListClear() == %v instead of %v\n\n",
 				listToStringStu5(link2), solution.ListToString(link.Head), link2.Head, link.Head)
 		}
 	}
diff --git a/tests/go/listfind_test.go b/tests/go/listfind_test.go
index a3459621..b3994b75 100644
--- a/tests/go/listfind_test.go
+++ b/tests/go/listfind_test.go
@@ -58,7 +58,7 @@ func TestListFind(t *testing.T) {
 
 			if aux != nil || aux1 != nil {
 				if *aux != *aux1 {
-					t.Errorf("ListFind(ref: %s) == %s instead of %s\n", arg.Data[(len(arg.Data)-1)/2], *aux, *aux1)
+					t.Fatalf("ListFind(ref: %s) == %s instead of %s\n", arg.Data[(len(arg.Data)-1)/2], *aux, *aux1)
 				}
 			}
 		}
@@ -74,7 +74,7 @@ func TestListFind(t *testing.T) {
 	aux1 := solution.ListFind(link, "lksdf", solution.CompStr)
 	if aux != nil && aux1 != nil {
 		if *aux != *aux1 {
-			t.Errorf("ListFind(ref: lksdf) == %s instead of %s\n", *aux, *aux1)
+			t.Fatalf("ListFind(ref: lksdf) == %s instead of %s\n", *aux, *aux1)
 		}
 	}
 
diff --git a/tests/go/listforeach_test.go b/tests/go/listforeach_test.go
index 1cd46017..bf9f4b41 100644
--- a/tests/go/listforeach_test.go
+++ b/tests/go/listforeach_test.go
@@ -56,11 +56,11 @@ func comparFuncList7(l *List7, l1 *ListS7, t *testing.T, f func(*Node7)) {
 	funcName := solution.GetName(f)
 	for l.Head != nil || l1.Head != nil {
 		if (l.Head == nil && l1.Head != nil) || (l.Head != nil && l1.Head == nil) {
-			t.Errorf("\nstudent list: %s\nlist: %s\nfunction used: %s\n\nListForEach() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent list: %s\nlist: %s\nfunction used: %s\n\nListForEach() == %v instead of %v\n\n",
 				listToStringStu8(l1), solution.ListToString(l.Head), funcName, l1.Head, l.Head)
 			return
 		} else if l.Head.Data != l1.Head.Data {
-			t.Errorf("\nstudent list: %s\nlist: %s\nfunction used: %s\n\nListForEach() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent list: %s\nlist: %s\nfunction used: %s\n\nListForEach() == %v instead of %v\n\n",
 				listToStringStu8(l1), solution.ListToString(l.Head), funcName, l1.Head.Data, l.Head.Data)
 			return
 		}
diff --git a/tests/go/listforeachif_test.go b/tests/go/listforeachif_test.go
index 8e884205..592e329d 100644
--- a/tests/go/listforeachif_test.go
+++ b/tests/go/listforeachif_test.go
@@ -87,11 +87,11 @@ func comparFuncList8(l *List8, l1 *ListS8, t *testing.T, f func(*Node8) bool, co
 	funcComp := solution.GetName(comp)
 	for l.Head != nil || l1.Head != nil {
 		if (l.Head == nil && l1.Head != nil) || (l.Head != nil && l1.Head == nil) {
-			t.Errorf("\nstudent list:%s\nlist:%s\nfunction f used: %s\nfunction comp: %s\n\nListForEachIf() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent list:%s\nlist:%s\nfunction f used: %s\nfunction comp: %s\n\nListForEachIf() == %v instead of %v\n\n",
 				listToStringStu7(l1), solution.ListToString(l.Head), funcComp, funcFName, l1.Head, l.Head)
 			return
 		} else if l.Head.Data != l1.Head.Data {
-			t.Errorf("\nstudent list:%s\nlist:%s\nfunction f used: %s\nfunction comp: %s\n\nListForEachIf() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent list:%s\nlist:%s\nfunction f used: %s\nfunction comp: %s\n\nListForEachIf() == %v instead of %v\n\n",
 				listToStringStu7(l1), solution.ListToString(l.Head), funcComp, funcFName, l1.Head.Data, l.Head.Data)
 			return
 		}
diff --git a/tests/go/listlast_test.go b/tests/go/listlast_test.go
index 83d87eb0..32faf482 100644
--- a/tests/go/listlast_test.go
+++ b/tests/go/listlast_test.go
@@ -70,7 +70,7 @@ func TestListLast(t *testing.T) {
 		aux1 := student.ListLast(link2)
 
 		if aux != aux1 {
-			t.Errorf("\nlist:%s\n\nListLast() == %v instead of %v\n\n",
+			t.Fatalf("\nlist:%s\n\nListLast() == %v instead of %v\n\n",
 				listToStringStu9(link2), aux1, aux)
 		}
 		link = &List3{}
diff --git a/tests/go/listmerge_test.go b/tests/go/listmerge_test.go
index e00d4ed6..fda272c7 100644
--- a/tests/go/listmerge_test.go
+++ b/tests/go/listmerge_test.go
@@ -61,11 +61,11 @@ func listPushBackTest11(l *ListS11, l1 *List11, data interface{}) {
 func comparFuncList11(l *List11, l1 *ListS11, t *testing.T) {
 	for l.Head != nil || l1.Head != nil {
 		if (l.Head == nil && l1.Head != nil) || (l.Head != nil && l1.Head == nil) {
-			t.Errorf("\nstudent list:%s\nlist:%s\n\nListMerge() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent list:%s\nlist:%s\n\nListMerge() == %v instead of %v\n\n",
 				listToStringStu(l1), solution.ListToString(l.Head), l1.Head, l.Head)
 			return
 		} else if l.Head.Data != l1.Head.Data {
-			t.Errorf("\nstudent list:%s\nlist:%s\n\nListMerge() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent list:%s\nlist:%s\n\nListMerge() == %v instead of %v\n\n",
 				listToStringStu(l1), solution.ListToString(l.Head), l1.Head.Data, l.Head.Data)
 			return
 		}
diff --git a/tests/go/listpushback_test.go b/tests/go/listpushback_test.go
index 0da0da4c..e59eefd6 100644
--- a/tests/go/listpushback_test.go
+++ b/tests/go/listpushback_test.go
@@ -31,11 +31,11 @@ func listToStringStu10(l *List) string {
 func comparFuncList(l *ListS, l1 *List, t *testing.T, data []interface{}) {
 	for l.Head != nil || l1.Head != nil {
 		if (l.Head == nil && l1.Head != nil) || (l.Head != nil && l1.Head == nil) {
-			t.Errorf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListPushBack()== %v instead of %v\n\n",
+			t.Fatalf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListPushBack()== %v instead of %v\n\n",
 				data, listToStringStu10(l1), solution.ListToString(l.Head), l1.Head, l.Head)
 			return
 		} else if l.Head.Data != l1.Head.Data {
-			t.Errorf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListPushBack()== %v instead of %v\n\n",
+			t.Fatalf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListPushBack()== %v instead of %v\n\n",
 				data, listToStringStu10(l1), solution.ListToString(l.Head), l1.Head.Data, l.Head.Data)
 			return
 		}
diff --git a/tests/go/listpushfront_test.go b/tests/go/listpushfront_test.go
index f8d8665c..9cc32f5f 100644
--- a/tests/go/listpushfront_test.go
+++ b/tests/go/listpushfront_test.go
@@ -31,11 +31,11 @@ func listToStringStu11(l *Lista) string {
 func comparFuncList1(l *Lista, l1 *ListSa, t *testing.T, data []interface{}) {
 	for l.Head != nil || l1.Head != nil {
 		if (l.Head == nil && l1.Head != nil) || (l.Head != nil && l1.Head == nil) {
-			t.Errorf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListPushFront()== %v instead of %v\n\n",
+			t.Fatalf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListPushFront()== %v instead of %v\n\n",
 				data, listToStringStu11(l), solution.ListToString(l1.Head), l.Head, l1.Head)
 			return
 		} else if l.Head.Data != l1.Head.Data {
-			t.Errorf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListPushFront()== %v instead of %v\n\n",
+			t.Fatalf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListPushFront()== %v instead of %v\n\n",
 				data, listToStringStu11(l), solution.ListToString(l1.Head), l.Head, l1.Head)
 			return
 		}
diff --git a/tests/go/listremoveif_test.go b/tests/go/listremoveif_test.go
index 47aa7366..1d00d997 100644
--- a/tests/go/listremoveif_test.go
+++ b/tests/go/listremoveif_test.go
@@ -56,11 +56,11 @@ func listPushBackTest10(l *ListS10, l1 *List10, data interface{}) {
 func comparFuncList10(l *List10, l1 *ListS10, t *testing.T, data interface{}) {
 	for l.Head != nil || l1.Head != nil {
 		if (l.Head == nil && l1.Head != nil) || (l.Head != nil && l1.Head == nil) {
-			t.Errorf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListRemoveIf() == %v instead of %v\n\n",
+			t.Fatalf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListRemoveIf() == %v instead of %v\n\n",
 				data, listToStringStu12(l1), solution.ListToString(l.Head), l1.Head, l.Head)
 			return
 		} else if l.Head.Data != l1.Head.Data {
-			t.Errorf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListRemoveIf() == %v instead of %v\n\n",
+			t.Fatalf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListRemoveIf() == %v instead of %v\n\n",
 				data, listToStringStu12(l1), solution.ListToString(l.Head), l1.Head.Data, l.Head.Data)
 			return
 		}
diff --git a/tests/go/listreverse_test.go b/tests/go/listreverse_test.go
index 16967ae1..500a8fae 100644
--- a/tests/go/listreverse_test.go
+++ b/tests/go/listreverse_test.go
@@ -32,11 +32,11 @@ func listToStringStu13(l *ListS6) string {
 func comparFuncList6(l *List6, l1 *ListS6, t *testing.T) {
 	for l.Head != nil || l1.Head != nil {
 		if (l.Head == nil && l1.Head != nil) || (l.Head != nil && l1.Head == nil) {
-			t.Errorf("\nstudent list:%s\nlist:%s\n\nListReverse() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent list:%s\nlist:%s\n\nListReverse() == %v instead of %v\n\n",
 				listToStringStu13(l1), solution.ListToString(l.Head), l1.Head, l.Head)
 			return
 		} else if l.Head.Data != l1.Head.Data {
-			t.Errorf("\nstudent list:%s\nlist:%s\n\nListReverse() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent list:%s\nlist:%s\n\nListReverse() == %v instead of %v\n\n",
 				listToStringStu13(l1), solution.ListToString(l.Head), l1.Head.Data, l.Head.Data)
 			return
 		}
diff --git a/tests/go/listsize_test.go b/tests/go/listsize_test.go
index 1550edda..2cb61226 100644
--- a/tests/go/listsize_test.go
+++ b/tests/go/listsize_test.go
@@ -54,7 +54,7 @@ func TestListSize(t *testing.T) {
 		aux := solution.ListSize(link)
 		aux2 := student.ListSize(link2)
 		if aux != aux2 {
-			t.Errorf("ListSize(%v) == %d instead of %d\n", solution.ListToString(link.Head), aux2, aux)
+			t.Fatalf("ListSize(%v) == %d instead of %d\n", solution.ListToString(link.Head), aux2, aux)
 		}
 		link = &List2{}
 		link2 = &ListS2{}
diff --git a/tests/go/listsort_test.go b/tests/go/listsort_test.go
index c309e45f..d7b1a678 100644
--- a/tests/go/listsort_test.go
+++ b/tests/go/listsort_test.go
@@ -51,11 +51,11 @@ func nodePushBackListInt12(l *NodeI12, l1 *NodeIS12, data int) {
 func comparFuncNodeInt12(l *NodeI12, l1 *NodeIS12, t *testing.T) {
 	for l != nil || l1 != nil {
 		if (l == nil && l1 != nil) || (l != nil && l1 == nil) {
-			t.Errorf("\nstudent list:%s\nlist:%s\n\nListSort() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent list:%s\nlist:%s\n\nListSort() == %v instead of %v\n\n",
 				printListStudent(l), solution.PrintList(l1), l, l1)
 			return
 		} else if l.Data != l1.Data {
-			t.Errorf("\nstudent list:%s\nlist:%s\n\nListSort() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent list:%s\nlist:%s\n\nListSort() == %v instead of %v\n\n",
 				printListStudent(l), solution.PrintList(l1), l.Data, l1.Data)
 			return
 		}
diff --git a/tests/go/pointone_test.go b/tests/go/pointone_test.go
index 25f6800a..4a34a059 100644
--- a/tests/go/pointone_test.go
+++ b/tests/go/pointone_test.go
@@ -10,6 +10,6 @@ func TestPointOne(t *testing.T) {
 	n := 0
 	student.PointOne(&n)
 	if n != 1 {
-		t.Errorf("PointOne(&n), n == %d instead of 1", n)
+		t.Fatalf("PointOne(&n), n == %d instead of 1", n)
 	}
 }
diff --git a/tests/go/printprogramname_test.go b/tests/go/printprogramname_test.go
index 92ba1494..28bfd4ad 100644
--- a/tests/go/printprogramname_test.go
+++ b/tests/go/printprogramname_test.go
@@ -12,19 +12,19 @@ func TestPrintProgramName(t *testing.T) {
 		strings.TrimPrefix(t.Name(), "Test"))
 	out, err1 := z01.MainOut("./student/printprogramname")
 	if err1 != nil {
-		t.Errorf(err1.Error())
+		t.Fatalf(err1.Error())
 	}
 
 	correct, err2 := z01.MainOut("./solutions/printprogramname")
 
 	if err2 != nil {
-		t.Errorf(err2.Error())
+		t.Fatalf(err2.Error())
 	}
 
 	arrOut := strings.Split(out, "/")
 	ArrCor := strings.Split(correct, "/")
 	if ArrCor[len(ArrCor)-1] != arrOut[len(arrOut)-1] {
-		t.Errorf("./%s prints %q instead of %q\n",
+		t.Fatalf("./%s prints %q instead of %q\n",
 			exercise, arrOut[len(arrOut)-1], ArrCor[len(ArrCor)-1])
 	}
 }
diff --git a/tests/go/solutions/addlinkednumbers/addlinkednumbers_test.go b/tests/go/solutions/addlinkednumbers/addlinkednumbers_test.go
index f7c6e643..94a7794f 100644
--- a/tests/go/solutions/addlinkednumbers/addlinkednumbers_test.go
+++ b/tests/go/solutions/addlinkednumbers/addlinkednumbers_test.go
@@ -87,17 +87,17 @@ func compareNodes(t *testing.T, stuResult *stuNode, solResult *solNode, num1, nu
 
 	} else if stuResult != nil && solResult == nil {
 		stuNum := stuNodeString(stuResult)
-		t.Errorf("\nAddLinkedNumbers(%v, %v) == %v instead of %v\n\n",
+		t.Fatalf("\nAddLinkedNumbers(%v, %v) == %v instead of %v\n\n",
 			num1, num2, stuNum, "")
 	} else if stuResult == nil && solResult != nil {
 		solNum := solNodeString(solResult)
-		t.Errorf("\nAddLinkedNumbers(%v, %v) == %v instead of %v\n\n",
+		t.Fatalf("\nAddLinkedNumbers(%v, %v) == %v instead of %v\n\n",
 			num1, num2, "", solNum)
 	} else {
 		stuNum := stuNodeString(stuResult)
 		solNum := solNodeString(solResult)
 		if stuNum != solNum {
-			t.Errorf("\nAddLinkedNumbers(%v, %v) == %v instead of %v\n\n",
+			t.Fatalf("\nAddLinkedNumbers(%v, %v) == %v instead of %v\n\n",
 				num1, num2, stuNum, solNum)
 		}
 	}
diff --git a/tests/go/solutions/challenge.go b/tests/go/solutions/challenge.go
index 87d75beb..5120f23d 100644
--- a/tests/go/solutions/challenge.go
+++ b/tests/go/solutions/challenge.go
@@ -100,7 +100,7 @@ func ChallengeTree(t *testing.T,
 	st2 := z01.Monitor(fn2, args2)
 
 	if st1.Stdout != st2.Stdout {
-		t.Errorf("%s(\n%s)\n prints %s instead of %s\n",
+		t.Fatalf("%s(\n%s)\n prints %s instead of %s\n",
 			z01.NameOfFunc(fn2),
 			FormatTree(arg1),
 			z01.Format(st2.Stdout),
@@ -124,7 +124,7 @@ func Challenge(t *testing.T, fn1, fn2 interface{}, arg1, arg2 interface{}, args
 	st2 := z01.Monitor(fn2, args2)
 
 	if st1.Stdout != st2.Stdout {
-		t.Errorf("%s(%s) prints %s instead of %s\n",
+		t.Fatalf("%s(%s) prints %s instead of %s\n",
 			z01.NameOfFunc(fn2),
 			z01.Format(arg2),
 			z01.Format(st2.Stdout),
diff --git a/tests/go/solutions/changeorder/changeorder_test.go b/tests/go/solutions/changeorder/changeorder_test.go
index e1d61a4a..ebd7c743 100644
--- a/tests/go/solutions/changeorder/changeorder_test.go
+++ b/tests/go/solutions/changeorder/changeorder_test.go
@@ -76,17 +76,17 @@ func compareNodes(t *testing.T, stuResult *stuNode, solResult *solNode, num1 int
 	if stuResult == nil && solResult == nil {
 	} else if stuResult != nil && solResult == nil {
 		stuNum := stuListToNum(stuResult)
-		t.Errorf("\nChangeorder(%s) == %v instead of %v\n\n",
+		t.Fatalf("\nChangeorder(%s) == %v instead of %v\n\n",
 			solList, stuNum, "")
 	} else if stuResult == nil && solResult != nil {
 		solNum := solListToNum(solResult)
-		t.Errorf("\nChangeorder(%s) == %v instead of %v\n\n",
+		t.Fatalf("\nChangeorder(%s) == %v instead of %v\n\n",
 			solList, "", solNum)
 	} else {
 		stuNum := stuListToNum(stuResult)
 		solNum := solListToNum(solResult)
 		if stuNum != solNum {
-			t.Errorf("\nChangeorder(%s) == %v instead of %v\n\n",
+			t.Fatalf("\nChangeorder(%s) == %v instead of %v\n\n",
 				solList, stuNum, solNum)
 		}
 	}
diff --git a/tests/go/solutions/checkfile.go b/tests/go/solutions/checkfile.go
index ab5b79a0..8b40afff 100644
--- a/tests/go/solutions/checkfile.go
+++ b/tests/go/solutions/checkfile.go
@@ -10,6 +10,6 @@ func CheckFile(t *testing.T, path string) {
 	_, err := os.Stat(path)
 
 	if err != nil {
-		t.Errorf(err.Error())
+		t.Fatalf(err.Error())
 	}
 }
diff --git a/tests/go/solutions/comparenode.go b/tests/go/solutions/comparenode.go
index 6e587ded..6b98ce7e 100644
--- a/tests/go/solutions/comparenode.go
+++ b/tests/go/solutions/comparenode.go
@@ -11,7 +11,7 @@ import (
 func CompareNode(t *testing.T, a *solutions.TreeNode, b *student.TreeNode) {
 	if a != nil && b != nil {
 		if a.Data != b.Data {
-			t.Errorf("expected %s instead of %s\n",
+			t.Fatalf("expected %s instead of %s\n",
 				a.Data,
 				b.Data,
 			)
@@ -20,12 +20,12 @@ func CompareNode(t *testing.T, a *solutions.TreeNode, b *student.TreeNode) {
 			CompareNode(t, a.Right, b.Right)
 		}
 	} else if a != nil && b == nil {
-		t.Errorf("expected %s instead of %v\n",
+		t.Fatalf("expected %s instead of %v\n",
 			a.Data,
 			b,
 		)
 	} else if a == nil && b != nil {
-		t.Errorf("expected %v instead of %v\n",
+		t.Fatalf("expected %v instead of %v\n",
 			a,
 			b.Data,
 		)
diff --git a/tests/go/solutions/comparereturn.go b/tests/go/solutions/comparereturn.go
index cc9c7b69..8b01e2ef 100644
--- a/tests/go/solutions/comparereturn.go
+++ b/tests/go/solutions/comparereturn.go
@@ -24,7 +24,7 @@ func CompareReturn(t *testing.T, fn1, fn2, arg1, arg2 interface{}) {
 			CompareNode(t, str, out2.Results[i].(*student.TreeNode))
 		default:
 			if !reflect.DeepEqual(str, out2.Results[i]) {
-				t.Errorf("%s(%s) == %s instead of %s\n",
+				t.Fatalf("%s(%s) == %s instead of %s\n",
 					z01.NameOfFunc(fn1),
 					z01.Format(arg1),
 					z01.Format(out1.Results...),
diff --git a/tests/go/solutions/comparetrees.go b/tests/go/solutions/comparetrees.go
index 94a5605a..006ae503 100644
--- a/tests/go/solutions/comparetrees.go
+++ b/tests/go/solutions/comparetrees.go
@@ -13,12 +13,12 @@ func CompareTrees(root *solutions.TreeNode, rootS *student.TreeNode, t *testing.
 		CompareTrees(root.Left, rootS.Left, t)
 		CompareTrees(root.Right, rootS.Right, t)
 		if root.Data != rootS.Data {
-			t.Errorf("BTreeInsertData(%v), node == %v instead of %v ",
+			t.Fatalf("BTreeInsertData(%v), node == %v instead of %v ",
 				root.Data, root.Data, rootS.Data)
 		}
 	} else if root != nil && rootS == nil {
-		t.Errorf("BTreeInsertData(%v), node == %v instead of %v ", root, root, rootS)
+		t.Fatalf("BTreeInsertData(%v), node == %v instead of %v ", root, root, rootS)
 	} else if root == nil && rootS != nil {
-		t.Errorf("BTreeInsertData(%v), node == %v instead of %v ", root, root, rootS)
+		t.Fatalf("BTreeInsertData(%v), node == %v instead of %v ", root, root, rootS)
 	}
 }
diff --git a/tests/go/solutions/inverttree/inverttree_test.go b/tests/go/solutions/inverttree/inverttree_test.go
index d6317afc..c4305620 100644
--- a/tests/go/solutions/inverttree/inverttree_test.go
+++ b/tests/go/solutions/inverttree/inverttree_test.go
@@ -160,8 +160,8 @@ func TestInvertTree(t *testing.T) {
 		if ret != 1 {
 			tree1 := returnSolTree(temp)
 			tree2 := returnStuTree(tmp)
-			t.Errorf("\n\"%v\" instead of \"%v\"\n\n", tree1, tree2)
-			// t.Errorf("\nError\n\n")
+			t.Fatalf("\n\"%v\" instead of \"%v\"\n\n", tree1, tree2)
+			// t.Fatalf("\nError\n\n")
 		}
 	}
 }
diff --git a/tests/go/solutions/listremoveifprog/listremoveifprog_test.go b/tests/go/solutions/listremoveifprog/listremoveifprog_test.go
index d0712589..5368186d 100644
--- a/tests/go/solutions/listremoveifprog/listremoveifprog_test.go
+++ b/tests/go/solutions/listremoveifprog/listremoveifprog_test.go
@@ -55,11 +55,11 @@ func listPushBackTest10(l *ListS10, l1 *List10, data interface{}) {
 func comparFuncList10(l *List10, l1 *ListS10, t *testing.T, data interface{}) {
 	for l.Head != nil || l1.Head != nil {
 		if (l.Head == nil && l1.Head != nil) || (l.Head != nil && l1.Head == nil) {
-			t.Errorf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListRemoveIf() == %v instead of %v\n\n",
+			t.Fatalf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListRemoveIf() == %v instead of %v\n\n",
 				data, listToStringStu12(l1), solution.ListToString(l.Head), l1.Head, l.Head)
 			return
 		} else if l.Head.Data != l1.Head.Data {
-			t.Errorf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListRemoveIf() == %v instead of %v\n\n",
+			t.Fatalf("\ndata used: %v\nstudent list:%s\nlist:%s\n\nListRemoveIf() == %v instead of %v\n\n",
 				data, listToStringStu12(l1), solution.ListToString(l.Head), l1.Head.Data, l.Head.Data)
 			return
 		}
diff --git a/tests/go/solutions/listsizeprog/listsizeprog_test.go b/tests/go/solutions/listsizeprog/listsizeprog_test.go
index ed03837c..24f5a6b8 100644
--- a/tests/go/solutions/listsizeprog/listsizeprog_test.go
+++ b/tests/go/solutions/listsizeprog/listsizeprog_test.go
@@ -53,7 +53,7 @@ func TestListSizeProg(t *testing.T) {
 		aux := solution.ListSize(link)
 		aux2 := ListSize(link2)
 		if aux != aux2 {
-			t.Errorf("ListSize(%v) == %d instead of %d\n", solution.ListToString(link.Head), aux2, aux)
+			t.Fatalf("ListSize(%v) == %d instead of %d\n", solution.ListToString(link.Head), aux2, aux)
 		}
 		link = &List2{}
 		link2 = &ListS2{}
diff --git a/tests/go/solutions/merge/merge_test.go b/tests/go/solutions/merge/merge_test.go
index 2e4887d0..20457043 100644
--- a/tests/go/solutions/merge/merge_test.go
+++ b/tests/go/solutions/merge/merge_test.go
@@ -147,7 +147,7 @@ func compareTrees(t *testing.T, stuResult *stuTreeNode, solResult, solTree1, sol
 		tree2 := returnSolTree(solTree2)
 		stuTree := returnStuTree(stuResult)
 		solTree := returnSolTree(solResult)
-		t.Errorf("\nMergeTrees(\"%v\", \"%v\") == \"%v\" instead of \"%v\"\n\n", tree1, tree2, stuTree, solTree)
+		t.Fatalf("\nMergeTrees(\"%v\", \"%v\") == \"%v\" instead of \"%v\"\n\n", tree1, tree2, stuTree, solTree)
 	}
 }
 
diff --git a/tests/go/solutions/reverse/reverse_test.go b/tests/go/solutions/reverse/reverse_test.go
index 0404b261..17e0bc7f 100644
--- a/tests/go/solutions/reverse/reverse_test.go
+++ b/tests/go/solutions/reverse/reverse_test.go
@@ -64,17 +64,17 @@ func compareNodes(t *testing.T, stuResult *stuNode, solResult *solNode, num1 int
 
 	} else if stuResult != nil && solResult == nil {
 		stuNum := stuListToNum(stuResult)
-		t.Errorf("\nReverse(%d) == %v instead of %v\n\n",
+		t.Fatalf("\nReverse(%d) == %v instead of %v\n\n",
 			num1, stuNum, "")
 	} else if stuResult == nil && solResult != nil {
 		solNum := solListToNum(solResult)
-		t.Errorf("\nReverse(%d) == %v instead of %v\n\n",
+		t.Fatalf("\nReverse(%d) == %v instead of %v\n\n",
 			num1, "", solNum)
 	} else {
 		stuNum := stuListToNum(stuResult)
 		solNum := solListToNum(solResult)
 		if stuNum != solNum {
-			t.Errorf("\nReverse(%d) == %v instead of %v\n\n",
+			t.Fatalf("\nReverse(%d) == %v instead of %v\n\n",
 				num1, stuNum, solNum)
 		}
 	}
diff --git a/tests/go/solutions/reversebits/reversebits_test.go b/tests/go/solutions/reversebits/reversebits_test.go
index e10083db..2da02841 100644
--- a/tests/go/solutions/reversebits/reversebits_test.go
+++ b/tests/go/solutions/reversebits/reversebits_test.go
@@ -14,7 +14,7 @@ func challengeBytes(t *testing.T,
 	st1 := z01.Monitor(fn1, args)
 	st2 := z01.Monitor(fn2, args)
 	if !reflect.DeepEqual(st1.Results, st2.Results) {
-		t.Errorf("%s(%08b) == %08b instead of %08b\n",
+		t.Fatalf("%s(%08b) == %08b instead of %08b\n",
 			z01.NameOfFunc(fn1),
 			args[0].(byte),
 			st1.Results[0].(byte),
diff --git a/tests/go/solutions/sametree/sametree_test.go b/tests/go/solutions/sametree/sametree_test.go
index ffb28c97..cf87323e 100644
--- a/tests/go/solutions/sametree/sametree_test.go
+++ b/tests/go/solutions/sametree/sametree_test.go
@@ -86,7 +86,7 @@ func compareResults(t *testing.T, stuResult, solResult bool, solTree1, solTree2
 	if stuResult != solResult {
 		tree1 := returnSolTree(solTree1)
 		tree2 := returnSolTree(solTree2)
-		t.Errorf("\nIsSameTree(\"%v\", \"%v\") == \"%v\" instead of \"%v\"\n\n", tree1, tree2, stuResult, solResult)
+		t.Fatalf("\nIsSameTree(\"%v\", \"%v\") == \"%v\" instead of \"%v\"\n\n", tree1, tree2, stuResult, solResult)
 	}
 }
 
diff --git a/tests/go/solutions/sortll/sortll_test.go b/tests/go/solutions/sortll/sortll_test.go
index 4079ffcb..2800d470 100644
--- a/tests/go/solutions/sortll/sortll_test.go
+++ b/tests/go/solutions/sortll/sortll_test.go
@@ -64,17 +64,17 @@ func compareNodes(t *testing.T, stuResult *stuNode, solResult *solNode, num1 int
 
 	} else if stuResult != nil && solResult == nil {
 		stuNum := stuListToNum(stuResult)
-		t.Errorf("\nSortll(%d) == %v instead of %v\n\n",
+		t.Fatalf("\nSortll(%d) == %v instead of %v\n\n",
 			num1, stuNum, "")
 	} else if stuResult == nil && solResult != nil {
 		solNum := solListToNum(solResult)
-		t.Errorf("\nSortll(%d) == %v instead of %v\n\n",
+		t.Fatalf("\nSortll(%d) == %v instead of %v\n\n",
 			num1, "", solNum)
 	} else {
 		stuNum := stuListToNum(stuResult)
 		solNum := solListToNum(solResult)
 		if stuNum != solNum {
-			t.Errorf("\nSortll(%d) == %v instead of %v\n\n",
+			t.Fatalf("\nSortll(%d) == %v instead of %v\n\n",
 				num1, stuNum, solNum)
 		}
 	}
diff --git a/tests/go/solutions/sortwordarrprog/sortwordarrprog_test.go b/tests/go/solutions/sortwordarrprog/sortwordarrprog_test.go
index 27f472be..51634beb 100644
--- a/tests/go/solutions/sortwordarrprog/sortwordarrprog_test.go
+++ b/tests/go/solutions/sortwordarrprog/sortwordarrprog_test.go
@@ -31,7 +31,7 @@ func TestSortWordArrProg(t *testing.T) {
 		SortWordArr(cp_stu)
 
 		if !reflect.DeepEqual(cp_stu, cp_sol) {
-			t.Errorf("%s(%v) == %v instead of %v\n",
+			t.Fatalf("%s(%v) == %v instead of %v\n",
 				"SortWordArr",
 				org,
 				cp_stu,
diff --git a/tests/go/solutions/swapbits/swapbits_test.go b/tests/go/solutions/swapbits/swapbits_test.go
index 819ca6cf..a41655e9 100644
--- a/tests/go/solutions/swapbits/swapbits_test.go
+++ b/tests/go/solutions/swapbits/swapbits_test.go
@@ -13,7 +13,7 @@ func challengeBytes(t *testing.T, fn1, fn2 interface{}, args ...interface{}) {
 	st1 := z01.Monitor(fn1, args)
 	st2 := z01.Monitor(fn2, args)
 	if !reflect.DeepEqual(st1.Results, st2.Results) {
-		t.Errorf("%s(%08b) == %08b instead of %08b\n",
+		t.Fatalf("%s(%08b) == %08b instead of %08b\n",
 			z01.NameOfFunc(fn1),
 			args[0].(byte),
 			st1.Results[0].(byte),
diff --git a/tests/go/solutions/swapprog/swapprog_test.go b/tests/go/solutions/swapprog/swapprog_test.go
index c9da1fa0..477256e8 100644
--- a/tests/go/solutions/swapprog/swapprog_test.go
+++ b/tests/go/solutions/swapprog/swapprog_test.go
@@ -15,10 +15,10 @@ func TestSwapProg(t *testing.T) {
 		bCopy := b
 		Swap(&a, &b)
 		if a != bCopy {
-			t.Errorf("Swap(%d, %d), a == %d instead of %d", aCopy, bCopy, a, bCopy)
+			t.Fatalf("Swap(%d, %d), a == %d instead of %d", aCopy, bCopy, a, bCopy)
 		}
 		if b != aCopy {
-			t.Errorf("Swap(%d, %d), b == %d instead of %d", aCopy, bCopy, b, aCopy)
+			t.Fatalf("Swap(%d, %d), b == %d instead of %d", aCopy, bCopy, b, aCopy)
 		}
 		i++
 	}
diff --git a/tests/go/sortedlistmerge_test.go b/tests/go/sortedlistmerge_test.go
index e0610e65..e0930dad 100644
--- a/tests/go/sortedlistmerge_test.go
+++ b/tests/go/sortedlistmerge_test.go
@@ -97,10 +97,10 @@ func TestSortedListMerge(t *testing.T) {
 
 		if aux == nil && aux2 == nil {
 		} else if aux != nil && aux2 == nil {
-			t.Errorf("\nstudent merged lists:%s\nmerged lists:%s\n\nSortListMerge() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent merged lists:%s\nmerged lists:%s\n\nSortListMerge() == %v instead of %v\n\n",
 				printListStudent1(aux), solution.PrintList(aux2), aux, aux2)
 		} else if aux.Data != aux2.Data {
-			t.Errorf("\nstudent merged lists:%s\nmerged lists:%s\n\nSortListMerge() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent merged lists:%s\nmerged lists:%s\n\nSortListMerge() == %v instead of %v\n\n",
 				printListStudent1(aux), solution.PrintList(aux2), aux, aux2)
 		}
 
diff --git a/tests/go/sortintegertable_test.go b/tests/go/sortintegertable_test.go
index 47212920..6a3730f6 100644
--- a/tests/go/sortintegertable_test.go
+++ b/tests/go/sortintegertable_test.go
@@ -24,7 +24,7 @@ func TestSortIntegerTable(t *testing.T) {
 		student.SortIntegerTable(table)
 		solutions.SortIntegerTable(table2)
 		if !reflect.DeepEqual(table, table2) {
-			t.Errorf("SortIntegerTable(%v), table == %v instead of %v ", tableCopyBefore, table, table2)
+			t.Fatalf("SortIntegerTable(%v), table == %v instead of %v ", tableCopyBefore, table, table2)
 		}
 		i++
 	}
diff --git a/tests/go/sortlist_test.go b/tests/go/sortlist_test.go
index 5c32e184..70a683ea 100644
--- a/tests/go/sortlist_test.go
+++ b/tests/go/sortlist_test.go
@@ -74,7 +74,7 @@ func compare(t *testing.T, l *solution.Nodelist, l1 *student.Nodelist, f func(a,
 
 	for l1 != nil && l != nil {
 		if l1.Data != l.Data {
-			t.Errorf("\nstudent list:%s\nlist:%s\nfunction cmp:%s\n\nSortListInsert() == %v instead of %v\n\n",
+			t.Fatalf("\nstudent list:%s\nlist:%s\nfunction cmp:%s\n\nSortListInsert() == %v instead of %v\n\n",
 				listToStringStu4(l1), listToString4(l), cmp, l1.Data, l.Data)
 			return
 		}
diff --git a/tests/go/sortlistinsert_test.go b/tests/go/sortlistinsert_test.go
index 2179e088..c2a7c7fb 100644
--- a/tests/go/sortlistinsert_test.go
+++ b/tests/go/sortlistinsert_test.go
@@ -55,11 +55,11 @@ func nodepushback2(l *NodeIS14, data int) *NodeIS14 {
 func comparFuncNodeInt14(l *NodeI14, l1 *NodeIS14, t *testing.T, data []int) {
 	for l != nil || l1 != nil {
 		if (l == nil && l1 != nil) || (l != nil && l1 == nil) {
-			t.Errorf("\ndata used to insert: %d\nstudent list:%s\nlist:%s\n\nSortListInsert() == %v instead of %v\n\n",
+			t.Fatalf("\ndata used to insert: %d\nstudent list:%s\nlist:%s\n\nSortListInsert() == %v instead of %v\n\n",
 				data, listToStringStu3(l), solution.PrintList(l1), l, l1)
 			return
 		} else if l.Data != l1.Data {
-			t.Errorf("\ndata used to insert: %d\nstudent list:%s\nlist:%s\n\nSortListInsert() == %v instead of %v\n\n",
+			t.Fatalf("\ndata used to insert: %d\nstudent list:%s\nlist:%s\n\nSortListInsert() == %v instead of %v\n\n",
 				data, listToStringStu3(l), solution.PrintList(l1), l.Data, l1.Data)
 			return
 		}
diff --git a/tests/go/sortwordarr_test.go b/tests/go/sortwordarr_test.go
index 95012152..eeee4dc9 100644
--- a/tests/go/sortwordarr_test.go
+++ b/tests/go/sortwordarr_test.go
@@ -32,7 +32,7 @@ func TestSortWordArr(t *testing.T) {
 		student.SortWordArr(cp_stu)
 
 		if !reflect.DeepEqual(cp_stu, cp_sol) {
-			t.Errorf("%s(%v) == %v instead of %v\n",
+			t.Fatalf("%s(%v) == %v instead of %v\n",
 				"SortWordArr",
 				org,
 				cp_stu,
diff --git a/tests/go/swap_test.go b/tests/go/swap_test.go
index b061f684..7f2dfb45 100644
--- a/tests/go/swap_test.go
+++ b/tests/go/swap_test.go
@@ -17,10 +17,10 @@ func TestSwap(t *testing.T) {
 		bCopy := b
 		student.Swap(&a, &b)
 		if a != bCopy {
-			t.Errorf("Swap(%d, %d), a == %d instead of %d", aCopy, bCopy, a, bCopy)
+			t.Fatalf("Swap(%d, %d), a == %d instead of %d", aCopy, bCopy, a, bCopy)
 		}
 		if b != aCopy {
-			t.Errorf("Swap(%d, %d), b == %d instead of %d", aCopy, bCopy, b, aCopy)
+			t.Fatalf("Swap(%d, %d), b == %d instead of %d", aCopy, bCopy, b, aCopy)
 		}
 		i++
 	}
diff --git a/tests/go/swapbits_test.go b/tests/go/swapbits_test.go
index 821b02c7..73ea392a 100644
--- a/tests/go/swapbits_test.go
+++ b/tests/go/swapbits_test.go
@@ -14,7 +14,7 @@ func challengeBytes(t *testing.T, fn1, fn2 interface{}, args ...interface{}) {
 	st1 := z01.Monitor(fn1, args)
 	st2 := z01.Monitor(fn2, args)
 	if !reflect.DeepEqual(st1.Results, st2.Results) {
-		t.Errorf("%s(%08b) == %08b instead of %08b\n",
+		t.Fatalf("%s(%08b) == %08b instead of %08b\n",
 			z01.NameOfFunc(fn1),
 			args[0].(byte),
 			st1.Results[0].(byte),
diff --git a/tests/go/ultimatedivmod_test.go b/tests/go/ultimatedivmod_test.go
index b67667d1..458de721 100644
--- a/tests/go/ultimatedivmod_test.go
+++ b/tests/go/ultimatedivmod_test.go
@@ -18,10 +18,10 @@ func TestUltimateDivMod(t *testing.T) {
 		mod := a % b
 		student.UltimateDivMod(&a, &b)
 		if a != div {
-			t.Errorf("DivMod(%d, %d), a == %d instead of %d", aCopy, bCopy, a, div)
+			t.Fatalf("DivMod(%d, %d), a == %d instead of %d", aCopy, bCopy, a, div)
 		}
 		if b != mod {
-			t.Errorf("DivMod(%d, %d), b == %d instead of %d", aCopy, bCopy, b, mod)
+			t.Fatalf("DivMod(%d, %d), b == %d instead of %d", aCopy, bCopy, b, mod)
 		}
 		i++
 	}
diff --git a/tests/go/ultimatepointone_test.go b/tests/go/ultimatepointone_test.go
index bdb1c941..250c1f04 100644
--- a/tests/go/ultimatepointone_test.go
+++ b/tests/go/ultimatepointone_test.go
@@ -12,6 +12,6 @@ func TestUltimatePointOne(t *testing.T) {
 	n := &b
 	student.UltimatePointOne(&n)
 	if a != 1 {
-		t.Errorf("UltimatePointOne(&n), a == %d instead of 1", a)
+		t.Fatalf("UltimatePointOne(&n), a == %d instead of 1", a)
 	}
 }