Add subject and test of the exercise `arrays`

rust/tests/arrays_test/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "arrays"
+version = "0.1.0"
+
+[[package]]
+name = "arrays_test"
+version = "0.1.0"
+dependencies = [
+ "arrays",
+]

rust/tests/arrays_test/Cargo.toml

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+[package]
+name = "arrays_test"
+version = "0.1.0"
+authors = ["Augusto <aug.ornelas@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+arrays = { path = "../../../../rust-piscine-solutions/arrays"}

rust/tests/arrays_test/src/main.rs

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+// Define a function call thirtytwo_tens that returns an array with 32
+// positions fill with only the value 10: [10, 10, 10, ... 10].len()
+// = 32
+
+// Write a function that takes an array of i32 and returns the sum of
+// the elements (make it work with the main)
+use arrays::*;
+
+fn main() {
+	let a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+	let a1: Vec<i32> = (1..11).collect();
+	let b = [5; 10];
+
+	println!("The Sum of the elements in {:?} = {}", a, sum(&a));
+	println!("The Sum of the elements in {:?} = {}", a1, sum(&a1));
+	println!("The Sum of the elements in {:?} = {}", b, sum(&b));
+	println!(
+		"Array size {} with only 10's in it {:?}",
+		thirtytwo_tens().len(),
+		thirtytwo_tens()
+	);
+}
+
+#[test]
+fn test_thirtytwo_tens() {
+	assert_eq!(thirtytwo_tens(), [10; 32]);
+}
+
+#[test]
+fn test_sum() {
+	let a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+	assert_eq!(sum(&a), a.iter().sum());
+}

subjects/arrays/README.md

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+## arrays
+
+### Instructions
+
+Define a function call thirtytwo_tens that returns an array with 32 positions fill with only the value 10: [10, 10, 10, ... 10].len()
+= 32
+
+Write a function that takes an array of i32 and returns the sum of the elements (make it work with the main)
+
+### Expected functions
+
+The type of one of the arguments is missing use the example `main` function to determine the correct type.
+
+```rust
+fn sum(a: _) -> i32 {
+}
+
+fn thirtytwo_tens() -> [i32; 32] {
+}
+```
+
+### Usage
+
+Here is a program to test your function.
+
+There is things missing in this program use the output and the other information that you have available to determine what is missing.
+
+```rust
+use arrays::{sum, thirtytwo_tens};
+
+fn main() {
+	let a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+	let a1: Vec<i32> = (1..11).;
+	let b = [_; 10];
+
+	println!("The Sum of the elements in {:?} = {}", a, sum(a));
+	println!("The Sum of the elements in {:?} = ", a1, sum(a1));
+	println!("The Sum of the elements in {:?} = {}", b, sum(b));
+	println!(
+		"Array size {} with only 10's in it {:?}",
+		thirtytwo_tens().len(),
+		thirtytwo_tens()
+	);
+}
+```
+
+And its output
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+The Sum of the elements in [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] = 55
+The Sum of the elements in [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] = 55
+The Sum of the elements in [5, 5, 5, 5, 5, 5, 5, 5, 5, 5] = 50
+Array size 32 with only 10's in it [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10]
+student@ubuntu:~/[[ROOT]]/test$
+```