iotests/testrunner.py: add doc string for run_test()

We are going to modify these methods and will add more documentation in
further commit. As a preparation add basic documentation.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20211203122223.2780098-2-vsementsov@virtuozzo.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Tested-by: John Snow <jsnow@redhat.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>

tests/qemu-iotests/testrunner.py

@@ -220,6 +220,12 @@ def find_reference(self, test: str) -> str:
         return f'{test}.out'
 
     def do_run_test(self, test: str) -> TestResult:
+        """
+        Run one test
+
+        :param test: test file path
+        """
+
         f_test = Path(test)
         f_bad = Path(f_test.name + '.out.bad')
         f_notrun = Path(f_test.name + '.notrun')
@@ -287,6 +293,13 @@ def do_run_test(self, test: str) -> TestResult:
 
     def run_test(self, test: str,
                  test_field_width: Optional[int] = None) -> TestResult:
+        """
+        Run one test and print short status
+
+        :param test: test file path
+        :param test_field_width: width for first field of status format
+        """
+
         last_el = self.last_elapsed.get(test)
         start = datetime.datetime.now().strftime('%H:%M:%S')