v/vlib/datatypes/queue_test.v

module datatypes

fn test_is_empty() {
	mut queue := Queue[int]{}
	assert queue.is_empty() == true
	queue.push(1)
	assert queue.is_empty() == false
}

fn test_len() {
	mut queue := Queue[int]{}
	assert queue.len() == 0
	queue.push(1)
	assert queue.len() == 1
	queue.pop()!
	assert queue.len() == 0
}

fn test_peek() {
	mut queue := Queue[int]{}
	queue.push(1)
	assert queue.peek()! == 1
	queue.push(2)
	assert queue.peek()! == 1
	queue = Queue[int]{}
	queue.peek() or { return }
	assert false
}

fn test_last() {
	mut queue := Queue[int]{}
	queue.push(1)
	assert queue.last()! == 1
	queue.push(2)
	assert queue.last()! == 2
	queue = Queue[int]{}
	queue.last() or { return }
	assert false
}

fn test_index() {
	mut queue := Queue[int]{}
	queue.push(1)
	assert queue.index(0)! == 1
	queue.push(2)
	assert queue.index(1)! == 2
	queue.pop()!
	queue.index(1) or { return }
	assert false
}

fn test_push() {
	mut queue := Queue[int]{}
	queue.push(1)
	queue.push(2)
	assert queue.peek()! == 1
}

fn test_pop() {
	mut queue := Queue[int]{}
	queue.push(1)
	queue.push(2)
	queue.push(3)
	assert queue.pop()! == 1
	queue.push(4)
	assert queue.pop()! == 2
	assert queue.pop()! == 3
	queue = Queue[int]{}
	queue.pop() or { return }
	assert false
}

fn test_array() {
	mut queue := Queue[int]{}
	queue.push(1)
	queue.push(2)
	assert queue.array() == [1, 2]
}