def test_get_port_docker_allow_fallback_docker_offline():
with mock.patch('subprocess.check_output') as check_output:
check_output.side_effect = [
subprocess.CalledProcessError(
1,
'the command',
b'the output',
),
]
check_output.returncode = 1
gen = docker_services('docker-compose.yml', docker_allow_fallback=True)
services = next(gen)
assert services.port_for('abc', 123) == 123
# Next yield is last.
with pytest.raises(StopIteration):
print(next(gen))
def test_docker_services_failure():
"""Propagate failure to start service."""
with mock.patch('subprocess.check_output') as check_output:
check_output.side_effect = [
subprocess.CalledProcessError(
1,
'the command',
b'the output',
),
]
check_output.returncode = 1
# The fixture is a context-manager.
gen = docker_services(
'docker-compose.yml',
docker_compose_project_name='pytest123',
docker_allow_fallback=False,
)
assert check_output.call_count == 0
# Failure propagates with improved diagnoatics.
with pytest.raises(Exception) as exc:
print(next(gen))
assert str(exc.value) == ('Command %r returned %d: """%s""".' % (
"the command",
1,
'the output',
))
assert check_output.call_count == 1
# Tear down code should not be called.
assert check_output.call_args_list == [
mock.call(
'docker-compose -f "docker-compose.yml" -p "pytest123" '
'up --build -d',
shell=True,
stderr=subprocess.STDOUT,
),
]
def test_docker_services_unused_port():
"""Complain loudly when the requested port is not used by the service."""
gen = docker_services(COMPOSE_FILE,
docker_compose_project_name='pytest123',
docker_allow_fallback=False,
docker_compose_project_dir='.')
services = next(gen)
# Can request port for services.
with pytest.raises(NoSuchService) as exc:
print(services.port_for('abc', 123))
assert str(exc.value) == 'No such service: abc'
with pytest.raises(ValueError) as exc:
print(services.port_for('hello', 123))
assert str(exc.value) == 'Could not detect port for "hello:123".'
# Next yield is last.
with pytest.raises(StopIteration):
print(next(gen))
def test_get_port_docker_allow_fallback_docker_offline():
with mock.patch('subprocess.call') as check_output:
check_output.side_effect = [Exception('')]
assert check_output.call_count == 0
# The fixture is a context-manager.
gen = docker_services(COMPOSE_FILE,
docker_compose_project_name='pytest123',
docker_allow_fallback=True,
docker_compose_project_dir='.')
services = next(gen)
assert isinstance(services, Services)
assert check_output.call_count == 1
# Can request port for services.
port = services.port_for('hello', 80)
assert port == 80
# Next yield is last.
with pytest.raises(StopIteration):
print(next(gen))