feat: add feature to pad iteration number

README.rst

@@ -88,6 +88,39 @@ For example:
 This will attempt to run test_file.py 1000 times, but will stop as soon as a failure
 occurs.
 
+Padding test iteration count
+----------------------------
+
+Use the :code:`--repeat-pad` command line option to specify the character to be used
+to pad the test iteration number, i.e. by prepending a :code:`0` or a space.
+This feature helps sorting the results in a generated report, i.e. the one made by
+pytest-html.
+
+.. code-block:: bash
+
+  $ pytest --count=10 --repeat-pad=" " test_file.py
+
+  ============================ test session starts ============================
+  [...]
+  test_file.py ..........                                               [100%]
+
+  ================================== PASSES ===================================
+  ========================== short test summary info ==========================
+  PASSED test_file.py::test_do_nothing[ 1-10]
+  PASSED test_file.py::test_do_nothing[ 2-10]
+  PASSED test_file.py::test_do_nothing[ 3-10]
+  PASSED test_file.py::test_do_nothing[ 4-10]
+  PASSED test_file.py::test_do_nothing[ 5-10]
+  PASSED test_file.py::test_do_nothing[ 6-10]
+  PASSED test_file.py::test_do_nothing[ 7-10]
+  PASSED test_file.py::test_do_nothing[ 8-10]
+  PASSED test_file.py::test_do_nothing[ 9-10]
+  PASSED test_file.py::test_do_nothing[10-10]
+  ============================ 10 passed in 0.02s =============================
+
+If more than one character is given, the setting is ignored.
+
+
 UnitTest Style Tests
 --------------------
 

pytest_repeat.py

@@ -23,6 +23,14 @@ def pytest_addoption(parser):
         choices=('function', 'class', 'module', 'session'),
         help='Scope for repeating tests')
 
+    parser.addoption(
+        '--repeat-pad',
+        action='store',
+        type=str,
+        default=None,
+        help='Character to be used for padding and aligning test repetions'
+    )
+
 
 def pytest_configure(config):
     config.addinivalue_line(
@@ -60,8 +68,18 @@ def pytest_generate_tests(metafunc):
     if count > 1:
         metafunc.fixturenames.append("__pytest_repeat_step_number")
 
-        def make_progress_id(i, n=count):
-            return '{0}-{1}'.format(i + 1, n)
+        pad_char = metafunc.config.option.repeat_pad
+        if pad_char is not None and len(pad_char) != 1:
+            warnings.warn("Padding should be by a character only")
+        if pad_char is not None and len(pad_char) == 1:
+            n_digits = len(str(count))
+
+            def make_progress_id(i, n=count):
+                return f"{i + 1:{pad_char}>{n_digits}}-{n}"
+        else:
+
+            def make_progress_id(i, n=count):
+                return '{0}-{1}'.format(i + 1, n)
 
         scope = metafunc.config.option.repeat_scope
         metafunc.parametrize(