kunit: tool: make --json handling a bit clearer

Currently kunit_json.get_json_result() will output the JSON-ified test
output to json_path, but iff it's not "stdout".

Instead, move the responsibility entirely over to the one caller.
Signed-off-by: NDaniel Latypov <dlatypov@google.com>
Reviewed-by: NDavid Gow <davidgow@google.com>
Reviewed-by: NBrendan Higgins <brendanhiggins@google.com>
Signed-off-by: NShuah Khan <skhan@linuxfoundation.org>

tools/testing/kunit/kunit.py

@@ -216,13 +216,17 @@ def parse_tests(request: KunitParseRequest, input_data: Iterable[str]) -> Tuple[
 	parse_end = time.time()
 
 	if request.json:
-		json_obj = kunit_json.get_json_result(
+		json_str = kunit_json.get_json_result(
 					test=test_result,
 					def_config='kunit_defconfig',
-					build_dir=request.build_dir,
-					json_path=request.json)
+					build_dir=request.build_dir)
 		if request.json == 'stdout':
-			print(json_obj)
+			print(json_str)
+		else:
+			with open(request.json, 'w') as f:
+				f.write(json_str)
+			kunit_parser.print_with_timestamp("Test results stored in %s" %
+				os.path.abspath(request.json))
 
 	if test_result.status != kunit_parser.TestStatus.SUCCESS:
 		return KunitResult(KunitStatus.TEST_FAILURE, parse_end - parse_start), test_result

tools/testing/kunit/kunit_json.py

@@ -51,15 +51,7 @@ def _get_group_json(test: Test, def_config: str,
 	return test_group
 
 def get_json_result(test: Test, def_config: str,
-		build_dir: Optional[str], json_path: str) -> str:
+		build_dir: Optional[str]) -> str:
 	test_group = _get_group_json(test, def_config, build_dir)
 	test_group["name"] = "KUnit Test Group"
-	json_obj = json.dumps(test_group, indent=4)
-	if json_path != 'stdout':
-		with open(json_path, 'w') as result_path:
-			result_path.write(json_obj)
-		root = __file__.split('tools/testing/kunit/')[0]
-		kunit_parser.print_with_timestamp(
-			"Test results stored in %s" %
-			os.path.join(root, result_path.name))
-	return json_obj
+	return json.dumps(test_group, indent=4)

tools/testing/kunit/kunit_tool_test.py

@@ -469,8 +469,7 @@ class KUnitJsonTest(unittest.TestCase):
 			json_obj = kunit_json.get_json_result(
 				test=test_result,
 				def_config='kunit_defconfig',
-				build_dir=None,
-				json_path='stdout')
+				build_dir=None)
 		return json.loads(json_obj)
 
 	def test_failed_test_json(self):