def test_image_exists_negative(docker_client):
docker_client.should_receive("inspect_image").with_args("img1").and_raise(_not_found_error)
result = exec_._image_exists(docker_client, "img1")
assert result == False
result = exec_._image_exists(docker_client, None)
assert result == False
def test_image_exists_positive(docker_client):
docker_client.should_receive("inspect_image").with_args("img1").and_return({"State": None})
result = exec_._image_exists(docker_client, "img1")
assert result == True