public/rust/tests/step_iterator_test/src/main.rs

// 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);
		}
	}
}