allow for running tests with break on error

CHANGES.rst

@@ -22,6 +22,7 @@ Full list of changes:
 - Improve performance of ``history.diff_against`` by reducing number of queries to 0 in most cases (gh-776)
 - Added Czech translations (gh-885)
 - Added pre-commit for better commit quality (gh-896)
+- Added ability to break into debugger on unit test failure (gh-890)
 
 3.0.0 (2021-04-16)
 ------------------

runtests.py

@@ -147,8 +147,10 @@ def __getitem__(self, item):
 
 def main():
     parser = ArgumentParser(description="Run package tests.")
-    parser.add_argument("--tag", action="append", nargs="?")
     parser.add_argument("--database", action="store", nargs="?", default="sqlite3")
+    parser.add_argument("--failfast", action="store_true")
+    parser.add_argument("--pdb", action="store_true")
+    parser.add_argument("--tag", action="append", nargs="?")
     namespace = parser.parse_args()
     db_settings = DATABASE_NAME_TO_DATABASE_SETTINGS[namespace.database]
     if not settings.configured:
@@ -157,12 +159,12 @@ def main():
     django.setup()
 
     tags = namespace.tag
-    failures = DiscoverRunner(failfast=False, tags=tags).run_tests(
-        ["simple_history.tests"]
-    )
-    failures |= DiscoverRunner(failfast=False, tags=tags).run_tests(
-        ["simple_history.registry_tests"]
-    )
+    failures = DiscoverRunner(
+        failfast=bool(namespace.failfast), pdb=bool(namespace.pdb), tags=tags
+    ).run_tests(["simple_history.tests"])
+    failures |= DiscoverRunner(
+        failfast=bool(namespace.failfast), pdb=bool(namespace.pdb), tags=tags
+    ).run_tests(["simple_history.registry_tests"])
     sys.exit(failures)
 
 

tox.ini

@@ -37,10 +37,10 @@ deps =
     mariadb: -rrequirements/mysql.txt
 
 commands =
-    sqlite3: coverage run -a runtests.py
-    postgres: coverage run -a runtests.py --database=postgres
-    mysql: coverage run -a runtests.py --database=mysql
-    mariadb: coverage run -a runtests.py --database=mariadb
+    sqlite3: coverage run -a runtests.py {posargs}
+    postgres: coverage run -a runtests.py --database=postgres {posargs}
+    mysql: coverage run -a runtests.py --database=mysql {posargs}
+    mariadb: coverage run -a runtests.py --database=mariadb {posargs}
     coverage report
 
 [testenv:format]