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

[Rae Moar <rmoar@google.com>]

In the case of the TAP output having an incorrect header format, the
parser used to output an error message of 'no tests run!'. Additionally,
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!'.  This patch corrects the error messages for these two cases
by switching the original outputted error messages and correcting the
tests in kunit_toot_test.py.

Signed-off-by: Rae Moar <rmoar@google.com>
---
 tools/testing/kunit/kunit_parser.py           |  6 +-
 tools/testing/kunit/kunit_tool_test.py        | 16 +++-
 ...is_test_passed-no_tests_run_no_header.log} |  0
 ...s_test_passed-no_tests_run_with_header.log | 77 +++++++++++++++++++
 4 files changed, 94 insertions(+), 5 deletions(-)
 rename tools/testing/kunit/test_data/{test_is_test_passed-no_tests_run.log => test_is_test_passed-no_tests_run_no_header.log} (100%)
 create mode 100644 tools/testing/kunit/test_data/test_is_test_passed-no_tests_run_with_header.log

diff --git a/tools/testing/kunit/kunit_parser.py b/tools/testing/kunit/kunit_parser.py
index c3c524b79db8..b88db3f51dc5 100644
--- 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 bdae0e5f6197..75045aa0f8a1 100755
--- 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
index 000000000000..18215b236783
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_is_test_passed-no_tests_run_with_header.log
@@ -0,0 +1,77 @@
+Core dump limits :
+	soft - 0
+	hard - NONE
+Checking environment variables for a tempdir...none found
+Checking if /dev/shm is on tmpfs...OK
+Checking PROT_EXEC mmap in /dev/shm...OK
+Adding 24743936 bytes to physical memory to account for exec-shield gap
+Linux version 4.12.0-rc3-00010-g7319eb35f493-dirty (brendanhiggins@mactruck.svl.corp.google.com) (gcc version 7.3.0 (Debian 7.3.0-5) ) #29 Thu Mar 15 14:57:19 PDT 2018
+Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 14038
+Kernel command line: root=98:0
+PID hash table entries: 256 (order: -1, 2048 bytes)
+Dentry cache hash table entries: 8192 (order: 4, 65536 bytes)
+Inode-cache hash table entries: 4096 (order: 3, 32768 bytes)
+Memory: 27868K/56932K available (1681K kernel code, 480K rwdata, 400K rodata, 89K init, 205K bss, 29064K reserved, 0K cma-reserved)
+SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
+NR_IRQS:15
+clocksource: timer: mask: 0xffffffffffffffff max_cycles: 0x1cd42e205, max_idle_ns: 881590404426 ns
+Calibrating delay loop... 7384.26 BogoMIPS (lpj=36921344)
+pid_max: default: 32768 minimum: 301
+Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
+Mountpoint-cache hash table entries: 512 (order: 0, 4096 bytes)
+Checking that host ptys support output SIGIO...Yes
+Checking that host ptys support SIGIO on close...No, enabling workaround
+Using 2.6 host AIO
+clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
+futex hash table entries: 256 (order: 0, 6144 bytes)
+clocksource: Switched to clocksource timer
+console [stderr0] disabled
+mconsole (version 2) initialized on /usr/local/google/home/brendanhiggins/.uml/6Ijecl/mconsole
+Checking host MADV_REMOVE support...OK
+workingset: timestamp_bits=62 max_order=13 bucket_order=0
+Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
+io scheduler noop registered
+io scheduler deadline registered
+io scheduler cfq registered (default)
+io scheduler mq-deadline registered
+io scheduler kyber registered
+Initialized stdio console driver
+Using a channel type which is configured out of UML
+setup_one_line failed for device 1 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 2 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 3 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 4 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 5 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 6 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 7 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 8 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 9 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 10 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 11 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 12 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 13 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 14 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 15 : Configuration failed
+Console initialized on /dev/tty0
+console [tty0] enabled
+console [mc-1] enabled
+TAP version 14
+1..0
+List of all partitions:
+No filesystem could mount root, tried:
+
+Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)
-- 
2.32.0.93.g670b81a890-goog