Add test and subject for exercise `step_iterator`

rust/tests/step_iterator_test/Cargo.lock

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

rust/tests/step_iterator_test/Cargo.toml

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

rust/tests/step_iterator_test/src/main.rs

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+// Create an Iterator (by implementing the std::iter::Iterator trait)
+// that iterates through the values from beg to end (including end) in
+// the indicated steps
+
+// The name of you're iterator will be StepIterator and it must be
+// generic so you can use any integer value: i8,..,i64 of floating
+// point number f32,..,f64
+
+// Define the associated function: `new` that creates a new Step iterator:
+// fn new(beg: T, end: T, step: T) -> StepIterator
+
+// For example:
+// for v in StepIterator::new(0, 100, 10) {
+// 	println!("{}", v);
+// }
+// must print:
+// 0
+// 10
+// 20
+// 30
+// 40
+// 50
+// 60
+// 70
+// 80
+// 90
+// 100
+
+// If the steps don't allow to arrive until the end of the sequence
+// only the last value inferior than the end of the series will be returned
+// Like beg: 0, end: 100, steps: 7 the last number returned will be
+// the last number returned will be 98
+
+use step_iterator::StepIterator;
+
+#[allow(dead_code)]
+fn main() {
+	for v in StepIterator::new(0, 100, 10) {
+		print!("{},", v);
+	}
+	println!();
+
+	for v in StepIterator::new(0, 100, 12) {
+		print!("{},", v)
+	}
+	println!();
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn test_next() {
+		let mut step_iterator = StepIterator::new(0, 100, 10);
+		assert_eq!(step_iterator.next(), Some(0));
+		assert_eq!(step_iterator.next(), Some(10));
+	}
+
+	#[test]
+	fn until_the_end() {
+		for (i, v) in StepIterator::new(0, 100, 10).enumerate() {
+			println!("position: {}, value: {}, ", i, v);
+			assert_eq!(i * 10, v);
+		}
+	}
+
+	#[test]
+	fn test_with_floats() {
+		for (i, v) in StepIterator::new(0.0, 10.0, 0.5).enumerate() {
+			println!("position: {}, value: {}, ", i, v);
+			assert_eq!(i as f64 * 0.5, v);
+		}
+	}
+
+	#[test]
+	fn test_with_floats_with_imperfect_range() {
+		for (i, v) in StepIterator::new(0.3, 10.0, 0.5).enumerate() {
+			println!("position: {}, value: {}, ", i, v);
+			assert_eq!(i as f64 * 0.5 + 0.3, v);
+		}
+	}
+}

subjects/step_iterator/README.md

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+## step_iterator
+
+### Instructions
+
+- Create an Iterator (by implementing the `std::iter::Iterator` trait) that iterates through the values from `beg` to `end` (including end) in the indicated `steps`.
+
+  - The name of you're iterator will be `StepIterator` and it must be generic so you can use any integer value: i8,..,i64, u8,..,u64 or floating point number f32,..,f64
+
+  - If the steps don't allow to arrive until the end of the sequence only the last value inferior to the end of the series will be returned (See Usage)
+
+- Define the associated function: `new` that creates a new Step iterator:
+
+### Expected Functions and Structures
+
+```rust
+pub struct StepIterator<T> {
+...
+}
+
+use std::ops::Add;
+impl StepIterator<T> {
+	pub fn new(beg: T, end: T, step: T) -> Self {
+	}
+}
+
+impl std::iter::Iterator for StepIterator<T> {
+}
+```
+
+### Usage
+
+Here is a program to test your function.
+
+```rust
+fn main() {
+	for v in StepIterator::new(0, 100, 10) {
+		print!("{},", v);
+	}
+	println!();
+
+	for v in StepIterator::new(0, 100, 12) {
+		print!("{},", v)
+	}
+	println!();
+}
+```
+
+And its output
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+0,10,20,30,40,50,60,70,80,90,100,
+0,12,24,36,48,60,72,84,96,
+student@ubuntu:~/[[ROOT]]/test$
+```