Add subject and test for the exercise `generic`

rust/tests/generics_test/Cargo.lock

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

rust/tests/generics_test/Cargo.toml

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+[package]
+name = "generics_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]
+generics = { path = "../../../../rust-piscine-solutions/generics"}

rust/tests/generics_test/src/main.rs

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+// Write a functions called identity that calculates the identity of a
+// value (receives any data type and returns the same value)
+use generics::*;
+
+fn main() {
+	println!("{}", identity("Hello, world!"));
+	println!("{}", identity(3));
+}
+
+#[derive(PartialEq, Debug)]
+struct Point {
+	x: i32,
+	y: i32,
+}
+
+#[test]
+fn test_with_int() {
+	assert_eq!(identity(3), 3);
+}
+
+#[test]
+fn test_with_float() {
+	assert_eq!(identity(1.0), 1.0);
+}
+
+#[test]
+fn test_with_str() {
+	assert_eq!(identity("you"), "you");
+}
+
+#[test]
+fn test_with_struct() {
+	let s = Point { x: 1, y: 2 };
+	assert_eq!(identity(&s), &s);
+}

subjects/generics/README.md

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+## generics
+
+### Instructions
+
+Write a functions called identity that calculates the identity of a value (receives any data type and returns the same value)
+
+### Expected Function
+
+```rust
+fn identity(v: _) -> _ {
+}
+```
+
+### Usage
+
+Here is a program to test your function.
+
+```rust
+fn main() {
+	println!("{}", identity("Hello, world!"));
+	println!("{}", identity(3));
+}
+```
+
+And its output
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+Hello, world!
+3
+student@ubuntu:~/[[ROOT]]/test$
+```