data-structures-and-algorithms/python/tests/data_structures/test_queue.py at main · lana-z/data-structures-and-algorithms · GitHub

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import pytest
from data_structures.queue import Queue
from data_structures.invalid_operation_error import InvalidOperationError


def test_exists():
    assert Queue


# @pytest.mark.skip("TODO")
def test_enqueue():
    q = Queue()
    q.enqueue("apple")
    actual = q.front.value
    expected = "apple"
    assert actual == expected


# @pytest.mark.skip("TODO")
def test_dequeue():
    q = Queue()
    q.enqueue("apple")
    q.enqueue("banana")
    actual = q.dequeue()
    expected = "apple"
    assert actual == expected


# @pytest.mark.skip("TODO")
def test_peek():
    q = Queue()
    q.enqueue("apple")
    q.enqueue("banana")
    q.enqueue("cucumber")
    actual = q.peek()
    expected = "apple"
    assert actual == expected


# @pytest.mark.skip("TODO")
def test_peek_when_empty():
    q = Queue()
    with pytest.raises(InvalidOperationError):
        q.peek()


# @pytest.mark.skip("TODO")
def test_enqueue_one():
    q = Queue()
    q.enqueue("apples")
    actual = q.peek()
    expected = "apples"
    assert actual == expected


# @pytest.mark.skip("TODO")
def test_enqueue_two():
    q = Queue()
    q.enqueue("apples")
    q.enqueue("bananas")
    actual = q.peek()
    expected = "apples"
    assert actual == expected


# @pytest.mark.skip("TODO")
def test_dequeue_when_empty():
    q = Queue()
    with pytest.raises(InvalidOperationError):
        q.dequeue()


# @pytest.mark.skip("TODO")
def test_dequeue_when_full():
    q = Queue()
    q.enqueue("apples")
    q.enqueue("bananas")
    actual = q.dequeue()
    expected = "apples"
    assert actual == expected


# @pytest.mark.skip("TODO")
def test_peek_post_dequeue():
    q = Queue()
    q.enqueue("apples")
    q.enqueue("bananas")
    q.dequeue()
    actual = q.peek()
    expected = "bananas"
    assert actual == expected


# @pytest.mark.skip("TODO")
def test_is_empty():
    q = Queue()
    actual = q.is_empty()
    expected = True
    assert actual == expected


# @pytest.mark.skip("TODO")
def test_exhausted():
    q = Queue()
    q.enqueue("apple")
    q.enqueue("banana")
    q.enqueue("cucumber")
    q.dequeue()
    q.dequeue()
    q.dequeue()
    actual = q.is_empty()
    expected = True
    assert actual == expected