(EXAMPLE) feat: add pytest flag to run v1 REST API tests

tests/conftest.py

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+# This Software (Dioptra) is being made available as a public service by the
+# National Institute of Standards and Technology (NIST), an Agency of the United
+# States Department of Commerce. This software was developed in part by employees of
+# NIST and in part by NIST contractors. Copyright in portions of this software that
+# were developed by NIST contractors has been licensed or assigned to NIST. Pursuant
+# to Title 17 United States Code Section 105, works of NIST employees are not
+# subject to copyright protection in the United States. However, NIST may hold
+# international copyright in software created by its employees and domestic
+# copyright (or licensing rights) in portions of software that were assigned or
+# licensed to NIST. To the extent that NIST holds copyright in this software, it is
+# being made available under the Creative Commons Attribution 4.0 International
+# license (CC BY 4.0). The disclaimers of the CC BY 4.0 license apply to all parts
+# of the software developed or licensed by NIST.
+#
+# ACCESS THE FULL CC BY 4.0 LICENSE HERE:
+# https://creativecommons.org/licenses/by/4.0/legalcode
+import pytest
+
+def pytest_addoption(parser):
+    parser.addoption(
+        "--run-v1", action="store_true", default=False, help="run v1 tests"
+    )
+
+
+def pytest_configure(config):
+    config.addinivalue_line("markers", "v1: mark test as v1")
+
+
+def pytest_collection_modifyitems(config, items):
+    if config.getoption("--run-v1"):
+        # --run-v1 given in cli: do not skip v1 tests
+        return
+    skip_v1 = pytest.mark.skip(reason="need --run-v1 option to run")
+    for item in items:
+        if "v1" in item.keywords:
+            item.add_marker(skip_v1)