[PATCH v7 08/21] dts: test suite docstring update

[Juraj Linkeš]

On Thu, Nov 16, 2023 at 11:16 PM Jeremy Spewock <jspewock at iol.unh.edu> wrote:
>
>
>
> On Wed, Nov 15, 2023 at 8:12 AM Juraj Linkeš <juraj.linkes at pantheon.tech> wrote:
>>
>> Format according to the Google format and PEP257, with slight
>> deviations.
>>
>> Signed-off-by: Juraj Linkeš <juraj.linkes at pantheon.tech>
>> ---
>>  dts/framework/test_suite.py | 223 +++++++++++++++++++++++++++---------
>>  1 file changed, 168 insertions(+), 55 deletions(-)
>>
>> diff --git a/dts/framework/test_suite.py b/dts/framework/test_suite.py
>> index d53553bf34..9e5251ffc6 100644
>> --- a/dts/framework/test_suite.py
>> +++ b/dts/framework/test_suite.py
>> @@ -2,8 +2,19 @@
>>  # Copyright(c) 2010-2014 Intel Corporation
>>  # Copyright(c) 2023 PANTHEON.tech s.r.o.
>>
>> -"""
>> -Base class for creating DTS test cases.
>> +"""Features common to all test suites.
>> +
>> +The module defines the :class:`TestSuite` class which doesn't contain any test cases, and as such
>> +must be extended by subclasses which add test cases. The :class:`TestSuite` contains the basics
>> +needed by subclasses:
>> +
>> +    * Test suite and test case execution flow,
>> +    * Testbed (SUT, TG) configuration,
>> +    * Packet sending and verification,
>> +    * Test case verification.
>> +
>> +The module also defines a function, :func:`get_test_suites`,
>> +for gathering test suites from a Python module.
>>  """
>>
>>  import importlib
>> @@ -31,25 +42,44 @@
>>
>>
>>  class TestSuite(object):
>> -    """
>> -    The base TestSuite class provides methods for handling basic flow of a test suite:
>> -    * test case filtering and collection
>> -    * test suite setup/cleanup
>> -    * test setup/cleanup
>> -    * test case execution
>> -    * error handling and results storage
>> -    Test cases are implemented by derived classes. Test cases are all methods
>> -    starting with test_, further divided into performance test cases
>> -    (starting with test_perf_) and functional test cases (all other test cases).
>> -    By default, all test cases will be executed. A list of testcase str names
>> -    may be specified in conf.yaml or on the command line
>> -    to filter which test cases to run.
>> -    The methods named [set_up|tear_down]_[suite|test_case] should be overridden
>> -    in derived classes if the appropriate suite/test case fixtures are needed.
>> +    """The base class with methods for handling the basic flow of a test suite.
>> +
>> +        * Test case filtering and collection,
>> +        * Test suite setup/cleanup,
>> +        * Test setup/cleanup,
>> +        * Test case execution,
>> +        * Error handling and results storage.
>> +
>> +    Test cases are implemented by subclasses. Test cases are all methods starting with ``test_``,
>> +    further divided into performance test cases (starting with ``test_perf_``)
>> +    and functional test cases (all other test cases).
>> +
>> +    By default, all test cases will be executed. A list of testcase names may be specified
>> +    in the YAML test run configuration file and in the :option:`--test-cases` command line argument
>> +    or in the :envvar:`DTS_TESTCASES` environment variable to filter which test cases to run.
>> +    The union of both lists will be used. Any unknown test cases from the latter lists
>> +    will be silently ignored.
>> +
>> +    If the :option:`--re-run` command line argument or the :envvar:`DTS_RERUN` environment variable
>> +    is set, in case of a test case failure, the test case will be executed again until it passes
>> +    or it fails that many times in addition of the first failure.
>> +
>> +    The methods named ``[set_up|tear_down]_[suite|test_case]`` should be overridden in subclasses
>> +    if the appropriate test suite/test case fixtures are needed.
>> +
>> +    The test suite is aware of the testbed (the SUT and TG) it's running on. From this, it can
>> +    properly choose the IP addresses and other configuration that must be tailored to the testbed.
>> +
>> +    Attributes:
>> +        sut_node: The SUT node where the test suite is running.
>> +        tg_node: The TG node where the test suite is running.
>> +        is_blocking: Whether the test suite is blocking. A failure of a blocking test suite
>> +            will block the execution of all subsequent test suites in the current build target.
>>      """
>
>
> Should this attribute section instead be comments in the form "#:" because they are class variables instead of instance ones?
>

Yes and no. The first two are not class variables, but the last one
is, so I'll change is_blocking to ClassVar. Thankfully the resulting
generated docs look just fine, the instance variables are listed
first, then class variables.

>>
>>
>>      sut_node: SutNode
>> -    is_blocking = False
>> +    tg_node: TGNode
>> +    is_blocking: bool = False
>>      _logger: DTSLOG
>>      _test_cases_to_run: list[str]
>>      _func: bool
>> @@ -72,6 +102,19 @@ def __init__(
>>          func: bool,
>>          build_target_result: BuildTargetResult,
>>      ):
>> +        """Initialize the test suite testbed information and basic configuration.
>> +
>> +        Process what test cases to run, create the associated :class:`TestSuiteResult`,
>> +        find links between ports and set up default IP addresses to be used when configuring them.
>> +
>> +        Args:
>> +            sut_node: The SUT node where the test suite will run.
>> +            tg_node: The TG node where the test suite will run.
>> +            test_cases: The list of test cases to execute.
>> +                If empty, all test cases will be executed.
>> +            func: Whether to run functional tests.
>> +            build_target_result: The build target result this test suite is run in.
>> +        """
>>          self.sut_node = sut_node
>>          self.tg_node = tg_node
>>          self._logger = getLogger(self.__class__.__name__)
>> @@ -95,6 +138,7 @@ def __init__(
>>          self._tg_ip_address_ingress = ip_interface("192.168.101.3/24")
>>
>>      def _process_links(self) -> None:
>> +        """Construct links between SUT and TG ports."""
>>          for sut_port in self.sut_node.ports:
>>              for tg_port in self.tg_node.ports:
>>                  if (sut_port.identifier, sut_port.peer) == (
>> @@ -106,27 +150,42 @@ def _process_links(self) -> None:
>>                      )
>>
>>      def set_up_suite(self) -> None:
>> -        """
>> -        Set up test fixtures common to all test cases; this is done before
>> -        any test case is run.
>> +        """Set up test fixtures common to all test cases.
>> +
>> +        This is done before any test case has been run.
>>          """
>>
>>      def tear_down_suite(self) -> None:
>> -        """
>> -        Tear down the previously created test fixtures common to all test cases.
>> +        """Tear down the previously created test fixtures common to all test cases.
>> +
>> +        This is done after all test have been run.
>>          """
>>
>>      def set_up_test_case(self) -> None:
>> -        """
>> -        Set up test fixtures before each test case.
>> +        """Set up test fixtures before each test case.
>> +
>> +        This is done before *each* test case.
>>          """
>>
>>      def tear_down_test_case(self) -> None:
>> -        """
>> -        Tear down the previously created test fixtures after each test case.
>> +        """Tear down the previously created test fixtures after each test case.
>> +
>> +        This is done after *each* test case.
>>          """
>>
>>      def configure_testbed_ipv4(self, restore: bool = False) -> None:
>> +        """Configure IPv4 addresses on all testbed ports.
>> +
>> +        The configured ports are:
>> +
>> +        * SUT ingress port,
>> +        * SUT egress port,
>> +        * TG ingress port,
>> +        * TG egress port.
>> +
>> +        Args:
>> +            restore: If :data:`True`, will remove the configuration instead.
>> +        """
>>          delete = True if restore else False
>>          enable = False if restore else True
>>          self._configure_ipv4_forwarding(enable)
>> @@ -153,11 +212,13 @@ def _configure_ipv4_forwarding(self, enable: bool) -> None:
>>      def send_packet_and_capture(
>>          self, packet: Packet, duration: float = 1
>>      ) -> list[Packet]:
>> -        """
>> -        Send a packet through the appropriate interface and
>> -        receive on the appropriate interface.
>> -        Modify the packet with l3/l2 addresses corresponding
>> -        to the testbed and desired traffic.
>> +        """Send and receive `packet` using the associated TG.
>> +
>> +        Send `packet` through the appropriate interface and receive on the appropriate interface.
>> +        Modify the packet with l3/l2 addresses corresponding to the testbed and desired traffic.
>> +
>> +        Returns:
>> +            A list of received packets.
>>          """
>>          packet = self._adjust_addresses(packet)
>>          return self.tg_node.send_packet_and_capture(
>> @@ -165,13 +226,25 @@ def send_packet_and_capture(
>>          )
>>
>>      def get_expected_packet(self, packet: Packet) -> Packet:
>> +        """Inject the proper L2/L3 addresses into `packet`.
>> +
>> +        Args:
>> +            packet: The packet to modify.
>> +
>> +        Returns:
>> +            `packet` with injected L2/L3 addresses.
>> +        """
>>          return self._adjust_addresses(packet, expected=True)
>>
>>      def _adjust_addresses(self, packet: Packet, expected: bool = False) -> Packet:
>> -        """
>> +        """L2 and L3 address additions in both directions.
>> +
>>          Assumptions:
>> -            Two links between SUT and TG, one link is TG -> SUT,
>> -            the other SUT -> TG.
>> +            Two links between SUT and TG, one link is TG -> SUT, the other SUT -> TG.
>> +
>> +        Args:
>> +            packet: The packet to modify.
>> +            expected: If :data:`True`, the direction is SUT -> TG, otherwise the direction is TG -> SUT.
>>          """
>>          if expected:
>>              # The packet enters the TG from SUT
>> @@ -197,6 +270,19 @@ def _adjust_addresses(self, packet: Packet, expected: bool = False) -> Packet:
>>          return Ether(packet.build())
>>
>>      def verify(self, condition: bool, failure_description: str) -> None:
>> +        """Verify `condition` and handle failures.
>> +
>> +        When `condition` is :data:`False`, raise an exception and log the last 10 commands
>> +        executed on both the SUT and TG.
>> +
>> +        Args:
>> +            condition: The condition to check.
>> +            failure_description: A short description of the failure
>> +                that will be stored in the raised exception.
>> +
>> +        Raises:
>> +            TestCaseVerifyError: `condition` is :data:`False`.
>> +        """
>>          if not condition:
>>              self._fail_test_case_verify(failure_description)
>>
>> @@ -216,6 +302,19 @@ def _fail_test_case_verify(self, failure_description: str) -> None:
>>      def verify_packets(
>>          self, expected_packet: Packet, received_packets: list[Packet]
>>      ) -> None:
>> +        """Verify that `expected_packet` has been received.
>> +
>> +        Go through `received_packets` and check that `expected_packet` is among them.
>> +        If not, raise an exception and log the last 10 commands
>> +        executed on both the SUT and TG.
>> +
>> +        Args:
>> +            expected_packet: The packet we're expecting to receive.
>> +            received_packets: The packets where we're looking for `expected_packet`.
>> +
>> +        Raises:
>> +            TestCaseVerifyError: `expected_packet` is not among `received_packets`.
>> +        """
>>          for received_packet in received_packets:
>>              if self._compare_packets(expected_packet, received_packet):
>>                  break
>> @@ -303,10 +402,14 @@ def _verify_l3_packet(self, received_packet: IP, expected_packet: IP) -> bool:
>>          return True
>>
>>      def run(self) -> None:
>> -        """
>> -        Setup, execute and teardown the whole suite.
>> -        Suite execution consists of running all test cases scheduled to be executed.
>> -        A test cast run consists of setup, execution and teardown of said test case.
>> +        """Set up, execute and tear down the whole suite.
>> +
>> +        Test suite execution consists of running all test cases scheduled to be executed.
>> +        A test case run consists of setup, execution and teardown of said test case.
>> +
>> +        Record the setup and the teardown and handle failures.
>> +
>> +        The list of scheduled test cases is constructed when creating the :class:`TestSuite` object.
>>          """
>>          test_suite_name = self.__class__.__name__
>>
>> @@ -338,9 +441,7 @@ def run(self) -> None:
>>                  raise BlockingTestSuiteError(test_suite_name)
>>
>>      def _execute_test_suite(self) -> None:
>> -        """
>> -        Execute all test cases scheduled to be executed in this suite.
>> -        """
>> +        """Execute all test cases scheduled to be executed in this suite."""
>>          if self._func:
>>              for test_case_method in self._get_functional_test_cases():
>>                  test_case_name = test_case_method.__name__
>> @@ -357,14 +458,18 @@ def _execute_test_suite(self) -> None:
>>                      self._run_test_case(test_case_method, test_case_result)
>>
>>      def _get_functional_test_cases(self) -> list[MethodType]:
>> -        """
>> -        Get all functional test cases.
>> +        """Get all functional test cases defined in this TestSuite.
>> +
>> +        Returns:
>> +            The list of functional test cases of this TestSuite.
>>          """
>>          return self._get_test_cases(r"test_(?!perf_)")
>>
>>      def _get_test_cases(self, test_case_regex: str) -> list[MethodType]:
>> -        """
>> -        Return a list of test cases matching test_case_regex.
>> +        """Return a list of test cases matching test_case_regex.
>> +
>> +        Returns:
>> +            The list of test cases matching test_case_regex of this TestSuite.
>>          """
>>          self._logger.debug(f"Searching for test cases in {self.__class__.__name__}.")
>>          filtered_test_cases = []
>> @@ -378,9 +483,7 @@ def _get_test_cases(self, test_case_regex: str) -> list[MethodType]:
>>          return filtered_test_cases
>>
>>      def _should_be_executed(self, test_case_name: str, test_case_regex: str) -> bool:
>> -        """
>> -        Check whether the test case should be executed.
>> -        """
>> +        """Check whether the test case should be scheduled to be executed."""
>>          match = bool(re.match(test_case_regex, test_case_name))
>>          if self._test_cases_to_run:
>>              return match and test_case_name in self._test_cases_to_run
>> @@ -390,9 +493,9 @@ def _should_be_executed(self, test_case_name: str, test_case_regex: str) -> bool
>>      def _run_test_case(
>>          self, test_case_method: MethodType, test_case_result: TestCaseResult
>>      ) -> None:
>> -        """
>> -        Setup, execute and teardown a test case in this suite.
>> -        Exceptions are caught and recorded in logs and results.
>> +        """Setup, execute and teardown a test case in this suite.
>> +
>> +        Record the result of the setup and the teardown and handle failures.
>>          """
>>          test_case_name = test_case_method.__name__
>>
>> @@ -427,9 +530,7 @@ def _run_test_case(
>>      def _execute_test_case(
>>          self, test_case_method: MethodType, test_case_result: TestCaseResult
>>      ) -> None:
>> -        """
>> -        Execute one test case and handle failures.
>> -        """
>> +        """Execute one test case, record the result and handle failures."""
>>          test_case_name = test_case_method.__name__
>>          try:
>>              self._logger.info(f"Starting test case execution: {test_case_name}")
>> @@ -452,6 +553,18 @@ def _execute_test_case(
>>
>>
>>  def get_test_suites(testsuite_module_path: str) -> list[type[TestSuite]]:
>> +    r"""Find all :class:`TestSuite`\s in a Python module.
>> +
>> +    Args:
>> +        testsuite_module_path: The path to the Python module.
>> +
>> +    Returns:
>> +        The list of :class:`TestSuite`\s found within the Python module.
>> +
>> +    Raises:
>> +        ConfigurationError: The test suite module was not found.
>> +    """
>> +
>>      def is_test_suite(object: Any) -> bool:
>>          try:
>>              if issubclass(object, TestSuite) and object is not TestSuite:
>> --
>> 2.34.1
>>