diff --git a/go/tests/common/is.go b/go/lib/is/is.go
similarity index 93%
rename from go/tests/common/is.go
rename to go/lib/is/is.go
index af9acc50b..44dd64a32 100644
--- a/go/tests/common/is.go
+++ b/go/lib/is/is.go
@@ -5,7 +5,7 @@ import (
 	"unicode"
 )
 
-func IsNumeric(s string) bool {
+func IsDigit(s string) bool {
 	for _, r := range s {
 		if !unicode.IsDigit(r) {
 			return false
diff --git a/go/tests/any/main.go b/go/tests/any/main.go
index fa08b724d..18f0ef983 100644
--- a/go/tests/any/main.go
+++ b/go/tests/any/main.go
@@ -17,7 +17,7 @@ func any(f func(string) bool, arr []string) bool {
 }
 
 func main() {
-	functions := []func(string) bool{common.IsNumeric, common.IsLower, common.IsUpper}
+	functions := []func(string) bool{common.IsDigit, common.IsLower, common.IsUpper}
 
 	type node struct {
 		f func(string) bool
@@ -35,7 +35,7 @@ func main() {
 	}
 	for i := 0; i < 5; i++ {
 		table = append(table, node{
-			f: common.IsNumeric,
+			f: common.IsDigit,
 			a: lib.MultRandDigit(),
 		})
 	}
@@ -55,11 +55,11 @@ func main() {
 
 	table = append(table,
 		node{
-			f: common.IsNumeric,
+			f: common.IsDigit,
 			a: []string{"Hello", "how", "are", "you"},
 		},
 		node{
-			f: common.IsNumeric,
+			f: common.IsDigit,
 			a: []string{"This", "is", "4", "you"},
 		},
 	)
diff --git a/go/tests/countif/main.go b/go/tests/countif/main.go
index f3642f669..8017fe252 100644
--- a/go/tests/countif/main.go
+++ b/go/tests/countif/main.go
@@ -18,7 +18,7 @@ func countIf(f func(string) bool, arr []string) int {
 }
 
 func main() {
-	functions := []func(string) bool{common.IsNumeric, common.IsLower, common.IsUpper}
+	functions := []func(string) bool{common.IsDigit, common.IsLower, common.IsUpper}
 
 	type node struct {
 		f   func(string) bool
@@ -37,7 +37,7 @@ func main() {
 	}
 	for i := 0; i < 5; i++ {
 		val := node{
-			f:   common.IsNumeric,
+			f:   common.IsDigit,
 			arr: lib.MultRandDigit(),
 		}
 		table = append(table, val)
@@ -60,11 +60,11 @@ func main() {
 
 	table = append(table,
 		node{
-			f:   common.IsNumeric,
+			f:   common.IsDigit,
 			arr: []string{"Hello", "how", "are", "you"},
 		},
 		node{
-			f:   common.IsNumeric,
+			f:   common.IsDigit,
 			arr: []string{"This", "is", "4", "you"},
 		},
 	)
diff --git a/go/tests/isnumeric/main.go b/go/tests/isnumeric/main.go
index 2e5b39255..3d3b43280 100644
--- a/go/tests/isnumeric/main.go
+++ b/go/tests/isnumeric/main.go
@@ -33,6 +33,6 @@ func main() {
 		"01,02,03",
 	)
 	for _, arg := range table {
-		lib.Challenge("IsNumeric", student.IsNumeric, common.IsNumeric, arg)
+		lib.Challenge("IsNumeric", student.IsNumeric, common.IsDigit, arg)
 	}
 }