pytest: add option --repeat

Author: PierreRaybaut

qwt/tests/conftest.py

@@ -22,3 +22,28 @@ def pytest_report_header(config):
         f"PythonQwt {qwt.__version__} [closest Qwt version: {qwt.QWT_VERSION_STR}]",
         f"{qtpy.API_NAME} {qtbindings_version} [Qt version: {qtpy.QT_VERSION}]",
     ]
+
+
+def pytest_addoption(parser):
+    """Add custom command line options to pytest."""
+    # See this StackOverflow answer for more information: https://t.ly/9anqz
+    parser.addoption(
+        "--repeat", action="store", help="Number of times to repeat each test"
+    )
+
+
+def pytest_generate_tests(metafunc):
+    """Generate tests for the given metafunc."""
+    # See this StackOverflow answer for more information: https://t.ly/9anqz
+    if metafunc.config.option.repeat is not None:
+        count = int(metafunc.config.option.repeat)
+
+        # We're going to duplicate these tests by parametrizing them,
+        # which requires that each test has a fixture to accept the parameter.
+        # We can add a new fixture like so:
+        metafunc.fixturenames.append("tmp_ct")
+
+        # Now we parametrize. This is what happens when we do e.g.,
+        # @pytest.mark.parametrize('tmp_ct', range(count))
+        # def test_foo(): pass
+        metafunc.parametrize("tmp_ct", range(count))