kunit: tool: improve compatibility of kunit_parser with KTAP specification

Update to kunit_parser to improve compatibility with KTAP
specification including arbitrarily nested tests. Patch accomplishes
three major changes:

- Use a general Test object to represent all tests rather than TestCase
and TestSuite objects. This allows for easier implementation of arbitrary
levels of nested tests and promotes the idea that both test suites and test
cases are tests.

- Print errors incrementally rather than all at once after the
parsing finishes to maximize information given to the user in the
case of the parser given invalid input and to increase the helpfulness
of the timestamps given during printing. Note that kunit.py parse does
not print incrementally yet. However, this fix brings us closer to
this feature.

- Increase compatibility for different formats of input. Arbitrary levels
of nested tests supported. Also, test cases and test suites are now
supported to be present on the same level of testing.

This patch now implements the draft KTAP specification here:
https://lore.kernel.org/linux-kselftest/CA+GJov6tdjvY9x12JsJT14qn6c7NViJxqaJk+r-K1YJzPggFDQ@mail.gmail.com/
We'll update the parser as the spec evolves.

This patch adjusts the kunit_tool_test.py file to check for
the correct outputs from the new parser and adds a new test to check
the parsing for a KTAP result log with correct format for multiple nested
subtests (test_is_test_passed-all_passed_nested.log).

This patch also alters the kunit_json.py file to allow for arbitrarily
nested tests.

Signed-off-by: Rae Moar <rmoar@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

1 files changed, 15 insertions, 4 deletions

diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
index 868b3995c222..e1dd3180f0d1 100755
--- a/tools/testing/kunit/kunit.py
+++ b/tools/testing/kunit/kunit.py
@@ -135,7 +135,7 @@ def exec_tests(linux: kunit_kernel.LinuxSourceTree, request: KunitExecRequest,
 				test_glob = request.filter_glob.split('.', maxsplit=2)[1]
 				filter_globs = [g + '.'+ test_glob for g in filter_globs]
 
-	overall_status = kunit_parser.TestStatus.SUCCESS
+	test_counts = kunit_parser.TestCounts()
 	exec_time = 0.0
 	for i, filter_glob in enumerate(filter_globs):
 		kunit_parser.print_with_timestamp('Starting KUnit Kernel ({}/{})...'.format(i+1, len(filter_globs)))
@@ -154,18 +154,29 @@ def exec_tests(linux: kunit_kernel.LinuxSourceTree, request: KunitExecRequest,
 		test_end = time.time()
 		exec_time += test_end - test_start
 
-		overall_status = kunit_parser.max_status(overall_status, result.status)
+		test_counts.add_subtest_counts(result.result.test.counts)
 
-	return KunitResult(status=result.status, result=result.result, elapsed_time=exec_time)
+	kunit_status = _map_to_overall_status(test_counts.get_status())
+	return KunitResult(status=kunit_status, result=result.result, elapsed_time=exec_time)
+
+def _map_to_overall_status(test_status: kunit_parser.TestStatus) -> KunitStatus:
+	if test_status in (kunit_parser.TestStatus.SUCCESS, kunit_parser.TestStatus.SKIPPED):
+		return KunitStatus.SUCCESS
+	else:
+		return KunitStatus.TEST_FAILURE
 
 def parse_tests(request: KunitParseRequest, input_data: Iterable[str]) -> KunitResult:
 	parse_start = time.time()
 
 	test_result = kunit_parser.TestResult(kunit_parser.TestStatus.SUCCESS,
-					      [],
+					      kunit_parser.Test(),
 					      'Tests not Parsed.')
 
 	if request.raw_output:
+		# Treat unparsed results as one passing test.
+		test_result.test.status = kunit_parser.TestStatus.SUCCESS
+		test_result.test.counts.passed = 1
+
 		output: Iterable[str] = input_data
 		if request.raw_output == 'all':
 			pass