kunit: tool: Fix error messages for cases of no tests and wrong TAP header

This patch addresses misleading error messages reported by kunit_tool in
two cases. First, in the case of TAP output having an incorrect header
format or missing a header, the parser used to output an error message of
'no tests run!'. Now the parser outputs an error message of 'could not
parse test results!'.

As an example:

Before:
$ ./tools/testing/kunit/kunit.py parse /dev/null
[ERROR] no tests run!
...

After:
$ ./tools/testing/kunit/kunit.py parse /dev/null
[ERROR] could not parse test results!
...

Second, in the case of TAP output with the correct header but no
tests, the parser used to output an error message of 'could not parse
test results!'. Now the parser outputs an error message of 'no tests
run!'.

As an example:

Before:
$ echo -e 'TAP version 14\n1..0' | ./tools/testing/kunit/kunit.py parse
[ERROR] could not parse test results!

After:
$ echo -e 'TAP version 14\n1..0' | ./tools/testing/kunit/kunit.py parse
[ERROR] no tests run!

Additionally, this patch also corrects the tests in kunit_tool_test.py
and adds a test to check the error in the case of TAP output with the
correct header but no tests.

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

diff --git a/tools/testing/kunit/kunit_parser.py b/tools/testing/kunit/kunit_parser.py
index c3c524b..b88db3f 100644 (file)
--- a/tools/testing/kunit/kunit_parser.py
+++ b/tools/testing/kunit/kunit_parser.py
@@ -338,9 +338,11 @@ def bubble_up_suite_errors(test_suites: Iterable[TestSuite]) -> TestStatus:
 def parse_test_result(lines: LineStream) -> TestResult:
        consume_non_diagnostic(lines)
        if not lines or not parse_tap_header(lines):
-               return TestResult(TestStatus.NO_TESTS, [], lines)
+               return TestResult(TestStatus.FAILURE_TO_PARSE_TESTS, [], lines)
        expected_test_suite_num = parse_test_plan(lines)
-       if not expected_test_suite_num:
+       if expected_test_suite_num == 0:
+               return TestResult(TestStatus.NO_TESTS, [], lines)
+       elif expected_test_suite_num is None:
                return TestResult(TestStatus.FAILURE_TO_PARSE_TESTS, [], lines)
        test_suites = []
        for i in range(1, expected_test_suite_num + 1):

diff --git a/tools/testing/kunit/kunit_tool_test.py b/tools/testing/kunit/kunit_tool_test.py
index bdae0e5..75045aa 100755 (executable)
--- a/tools/testing/kunit/kunit_tool_test.py
+++ b/tools/testing/kunit/kunit_tool_test.py
@@ -157,8 +157,18 @@ class KUnitParserTest(unittest.TestCase):
                        kunit_parser.TestStatus.FAILURE,
                        result.status)
 
+       def test_no_header(self):
+               empty_log = test_data_path('test_is_test_passed-no_tests_run_no_header.log')
+               with open(empty_log) as file:
+                       result = kunit_parser.parse_run_tests(
+                               kunit_parser.extract_tap_lines(file.readlines()))
+               self.assertEqual(0, len(result.suites))
+               self.assertEqual(
+                       kunit_parser.TestStatus.FAILURE_TO_PARSE_TESTS,
+                       result.status)
+
        def test_no_tests(self):
-               empty_log = test_data_path('test_is_test_passed-no_tests_run.log')
+               empty_log = test_data_path('test_is_test_passed-no_tests_run_with_header.log')
                with open(empty_log) as file:
                        result = kunit_parser.parse_run_tests(
                                kunit_parser.extract_tap_lines(file.readlines()))
@@ -173,7 +183,7 @@ class KUnitParserTest(unittest.TestCase):
                with open(crash_log) as file:
                        result = kunit_parser.parse_run_tests(
                                kunit_parser.extract_tap_lines(file.readlines()))
-               print_mock.assert_any_call(StrContains('no tests run!'))
+               print_mock.assert_any_call(StrContains('could not parse test results!'))
                print_mock.stop()
                file.close()
 
@@ -309,7 +319,7 @@ class KUnitJsonTest(unittest.TestCase):
                        result["sub_groups"][1]["test_cases"][0])
 
        def test_no_tests_json(self):
-               result = self._json_for('test_is_test_passed-no_tests_run.log')
+               result = self._json_for('test_is_test_passed-no_tests_run_with_header.log')
                self.assertEqual(0, len(result['sub_groups']))
 
 class StrContains(str):

diff --git a/tools/testing/kunit/test_data/test_is_test_passed-no_tests_run.log b/tools/testing/kunit/test_data/test_is_test_passed-no_tests_run_no_header.log
similarity index 100%
rename from tools/testing/kunit/test_data/test_is_test_passed-no_tests_run.log
rename to tools/testing/kunit/test_data/test_is_test_passed-no_tests_run_no_header.log

diff --git a/tools/testing/kunit/test_data/test_is_test_passed-no_tests_run_with_header.log b/tools/testing/kunit/test_data/test_is_test_passed-no_tests_run_with_header.log
new file mode 100644 (file)
index 0000000..5f48ee6
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_is_test_passed-no_tests_run_with_header.log
@@ -0,0 +1,2 @@
+TAP version 14
+1..0