def test_multiple_write():
channel = IOChannel()
channel.write("1")
channel.write("2")
channel.write("3")
output = channel.read()
assert output == "123"
def test_mixed():
channel = IOChannel()
channel.write("1")
output = channel.read()
assert output == "1"
channel.write("2")
output = channel.read()
assert output == "12"
def test_external_ignores_stdin():
command = CallExternal()
command.set_args(["echo", "1"])
output = IOChannel()
input = IOChannel()
input.write("input")
command.set_input_channel(input)
command.set_output_channel(output)
command.execute()
expected = "1\n"
assert output.read() == expected
def test_external_from_channel():
command = CallExternal()
command.set_args(["sort"])
output = IOChannel()
input = IOChannel()
input.write("3\n2\n1\n")
command.set_input_channel(input)
command.set_output_channel(output)
command.execute()
expected = "1\n2\n3\n"
assert output.read() == expected
def test_echo_ignores_input_channel():
command = Echo()
input = IOChannel()
input.write("my input")
output = IOChannel()
command.set_args(["echo"])
command.set_output_channel(output)
command.set_input_channel(input)
command.execute()
expected = "\n"
assert output.read() == expected
def test_wc_from_channel():
command = Wc()
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 = "1 2 8\n"
assert output.read() == expected
def test_single_io():
channel = IOChannel()
channel.write("value")
output = channel.read()
assert output == "value"