regrtest: nicer output for durations

Use milliseconds and minutes units, not only seconds.

Lib/test/libregrtest/main.py

@@ -34,6 +34,16 @@ else:
 TEMPDIR = os.path.abspath(TEMPDIR)
 
 
+def format_duration(seconds):
+    if seconds < 1.0:
+        return '%.0f ms' % (seconds * 1e3)
+    if seconds < 60.0:
+        return '%.0f sec' % seconds
+
+    minutes, seconds = divmod(seconds, 60.0)
+    return '%.0f min %.0f sec' % (minutes, seconds)
+
+
 class Regrtest:
     """Execute a test suite.
 
@@ -107,14 +117,6 @@ class Regrtest:
             self.skipped.append(test)
             self.resource_denieds.append(test)
 
-    def time_delta(self, ceil=False):
-        seconds = time.monotonic() - self.start_time
-        if ceil:
-            seconds = math.ceil(seconds)
-        else:
-            seconds = int(seconds)
-        return datetime.timedelta(seconds=seconds)
-
     def display_progress(self, test_index, test):
         if self.ns.quiet:
             return
@@ -122,12 +124,14 @@ class Regrtest:
             fmt = "{time} [{test_index:{count_width}}{test_count}/{nbad}] {test_name}"
         else:
             fmt = "{time} [{test_index:{count_width}}{test_count}] {test_name}"
+        test_time = time.monotonic() - self.start_time
+        test_time = datetime.timedelta(seconds=int(test_time))
         line = fmt.format(count_width=self.test_count_width,
                           test_index=test_index,
                           test_count=self.test_count,
                           nbad=len(self.bad),
                           test_name=test,
-                          time=self.time_delta())
+                          time=test_time)
         print(line, flush=True)
 
     def parse_args(self, kwargs):
@@ -286,9 +290,10 @@ class Regrtest:
 
         if self.ns.print_slow:
             self.test_times.sort(reverse=True)
+            print()
             print("10 slowest tests:")
             for time, test in self.test_times[:10]:
-                print("%s: %.1fs" % (test, time))
+                print("- %s: %s" % (test, format_duration(time)))
 
         if self.bad:
             print(count(len(self.bad), "test"), "failed:")
@@ -342,7 +347,7 @@ class Regrtest:
             previous_test = format_test_result(test, result[0])
             test_time = time.monotonic() - start_time
             if test_time >= PROGRESS_MIN_TIME:
-                previous_test = "%s in %.0f sec" % (previous_test, test_time)
+                previous_test = "%s in %s" % (previous_test, format_duration(test_time))
             elif result[0] == PASSED:
                 # be quiet: say nothing if the test passed shortly
                 previous_test = None
@@ -418,7 +423,9 @@ class Regrtest:
             r.write_results(show_missing=True, summary=True,
                             coverdir=self.ns.coverdir)
 
-        print("Total duration: %s" % self.time_delta(ceil=True))
+        print()
+        duration = time.monotonic() - self.start_time
+        print("Total duration: %s" % format_duration(duration))
 
         if self.ns.runleaks:
             os.system("leaks %d" % os.getpid())

Lib/test/test_regrtest.py

@@ -660,13 +660,13 @@ class ArgsTestCase(BaseTestCase):
         output = self.run_tests(test, exitcode=1)
         self.check_executed_tests(output, test, omitted=test)
 
-    def test_slow(self):
+    def test_slowest(self):
         # test --slowest
         tests = [self.create_test() for index in range(3)]
         output = self.run_tests("--slowest", *tests)
         self.check_executed_tests(output, tests)
         regex = ('10 slowest tests:\n'
-                 '(?:%s: [0-9]+\.[0-9]+s\n){%s}'
+                 '(?:- %s: .*\n){%s}'
                  % (self.TESTNAME_REGEX, len(tests)))
         self.check_line(output, regex)