def test_cat_to_stdout(capsys):
command = Cat()
command.set_args(["cat", "Bash-CLI/src/tests/data/example.txt"])
command.execute()
expected = "first line\nsecond\n123"
captured = capsys.readouterr()
assert captured.out == expected
def test_cat_from_argument():
command = Cat()
output = IOChannel()
command.set_args(["cat", "Bash-CLI/src/tests/data/example.txt"])
command.set_output_channel(output)
command.execute()
expected = "first line\nsecond\n123"
assert output.read() == expected
def test_cat_from_channel():
command = Cat()
input = IOChannel()
input.write("my input")
output = IOChannel()
command.set_args(["cat"])
command.set_output_channel(output)
command.set_input_channel(input)
command.execute()
expected = "my input"
assert output.read() == expected