Add subject and test for exercise `vector_operations`

rust/tests/vector_operations_test/Cargo.lock

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

rust/tests/vector_operations_test/Cargo.toml

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

rust/tests/vector_operations_test/src/main.rs

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+// Define the structures ThreeDvector that represents a 3 dimensional
+// vector in (for convention in physics the vector are represented as
+// ai + bj + ck where a, b, and c are real numbers and i, j and k
+// represent the direction x,y and z respectively in the Cartesian plane
+// there for we use the names i, j and k for the fields in the
+// ThreeDVector structure
+
+// Look how the operations Addition and Subtraction work for a 3
+// dimensional vector and implement them by implementing the
+// std::ops::Add and std::ops::Sub traits
+
+use vector_operations::ThreeDVector;
+
+#[allow(dead_code)]
+fn main() {
+	let a = ThreeDVector { i: 3, j: 5, k: 2 };
+	let b = ThreeDVector { i: 2, j: 7, k: 4 };
+	println!("{:?}", a + b);
+}
+
+#[test]
+fn it_works() {
+	assert_eq!(2 + 2, 4);
+}
+
+#[test]
+fn test_addition() {
+	let a = ThreeDVector { i: 3, j: 5, k: 2 };
+	let b = ThreeDVector { i: 2, j: 7, k: 4 };
+	let a_plus_b = ThreeDVector { i: 5, j: 12, k: 6 };
+	assert_eq!(a + b, a_plus_b);
+}
+
+#[test]
+fn test_subtraction() {
+	let a = ThreeDVector { i: 3, j: 5, k: 2 };
+	let b = ThreeDVector { i: 2, j: 7, k: 4 };
+	let a_minus_b = ThreeDVector { i: 1, j: -2, k: -2 };
+	assert_eq!(a - b, a_minus_b);
+}

subjects/vector_operations/README.md

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+## vector_operations
+
+### Instructions
+
+Define the structures ThreeDvector that represents a 3 dimensional vector in (for convention in physics the vector are represented as ai + bj + ck where a, b, and c are real numbers and i, j and k represent the direction x,y and z respectively in the Cartesian plane there for we use the names i, j and k for the fields in the ThreeDVector structure
+
+Look how the operations Addition and Subtraction work for a 3 dimensional vector and implement them by implementing the std::ops::Add and std::ops::Sub traits
+
+### Expected Functions and Structures
+
+```rust
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub struct ThreeDVector<T> {
+	pub i: T,
+	pub j: T,
+	pub k: T,
+}
+
+use std::ops::{Add, Sub};
+
+impl Add for ThreeDVector<T> {
+}
+
+impl Sub for ThreeDVector<T> {
+}
+```
+
+### Usage
+
+Here is a program to test your function.
+
+```rust
+use vector_operations::ThreeDVector;
+
+fn main() {
+	let a = ThreeDVector { i: 3, j: 5, k: 2 };
+	let b = ThreeDVector { i: 2, j: 7, k: 4 };
+	println!("{:?}", a + b);
+}
+```
+
+And its output
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+ThreeDVector { i: 5, j: 12, k: 6 }
+student@ubuntu:~/[[ROOT]]/test$
+```