Make the tests into a package

Useful to make the tests runnable in a frozen build.

kitty_tests/main.py

@@ -0,0 +1,99 @@
+#!/usr/bin/env python
+# vim:fileencoding=utf-8
+# License: GPLv3 Copyright: 2021, Kovid Goyal <kovid at kovidgoyal.net>
+
+import importlib
+import os
+import sys
+import unittest
+from importlib.resources import contents
+from typing import Callable, Generator, NoReturn, Sequence, Set
+
+
+def itertests(suite: unittest.TestSuite) -> Generator[unittest.TestCase, None, None]:
+    stack = [suite]
+    while stack:
+        suite = stack.pop()
+        for test in suite:
+            if isinstance(test, unittest.TestSuite):
+                stack.append(test)
+                continue
+            if test.__class__.__name__ == 'ModuleImportFailure':
+                raise Exception('Failed to import a test module: %s' % test)
+            yield test
+
+
+def find_all_tests(package: str = '', excludes: Sequence[str] = ('main.py', 'gr.py')) -> unittest.TestSuite:
+    suits = []
+    if not package:
+        package = __name__.rpartition('.')[0] if '.' in __name__ else 'kitty_tests'
+    for x in contents(package):
+        if x.endswith('.py') and x not in excludes:
+            m = importlib.import_module(package + '.' + x.partition('.')[0])
+            suits.append(unittest.defaultTestLoader.loadTestsFromModule(m))
+    return unittest.TestSuite(suits)
+
+
+def filter_tests(suite: unittest.TestSuite, test_ok: Callable[[unittest.TestCase], bool]) -> unittest.TestSuite:
+    ans = unittest.TestSuite()
+    added: Set[unittest.TestCase] = set()
+    for test in itertests(suite):
+        if test_ok(test) and test not in added:
+            ans.addTest(test)
+            added.add(test)
+    return ans
+
+
+def filter_tests_by_name(suite: unittest.TestSuite, *names: str) -> unittest.TestSuite:
+    names_ = {x if x.startswith('test_') else 'test_' + x for x in names}
+
+    def q(test: unittest.TestCase) -> bool:
+        return test._testMethodName in names_
+    return filter_tests(suite, q)
+
+
+def filter_tests_by_module(suite: unittest.TestSuite, *names: str) -> unittest.TestSuite:
+    names_ = frozenset(names)
+
+    def q(test: unittest.TestCase) -> bool:
+        m = test.__class__.__module__.rpartition('.')[-1]
+        return m in names_
+    return filter_tests(suite, q)
+
+
+def type_check() -> NoReturn:
+    from kitty.cli_stub import generate_stub  # type:ignore
+    generate_stub()
+    from kitty.options_stub import generate_stub  # type: ignore
+    generate_stub()
+    from kittens.tui.operations_stub import generate_stub  # type: ignore
+    generate_stub()
+    os.execlp(sys.executable, 'python', '-m', 'mypy', '--pretty')
+
+
+def run_cli(suite: unittest.TestSuite, verbosity: int = 4) -> None:
+    r = unittest.TextTestRunner
+    r.resultclass = unittest.TextTestResult
+    runner = r(verbosity=verbosity)
+    runner.tb_locals = True  # type: ignore
+    result = runner.run(suite)
+    if not result.wasSuccessful():
+        raise SystemExit(1)
+
+
+def run_tests() -> None:
+    import argparse
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        'name', nargs='*', default=[],
+        help='The name of the test to run, for e.g. linebuf corresponds to test_linebuf. Can be specified multiple times')
+    parser.add_argument('--verbosity', default=4, type=int, help='Test verbosity')
+    args = parser.parse_args()
+    if args.name and args.name[0] in ('type-check', 'type_check', 'mypy'):
+        type_check()
+    tests = find_all_tests()
+    if args.name:
+        tests = filter_tests_by_name(tests, *args.name)
+        if not tests._tests:
+            raise SystemExit('No test named %s found' % args.name)
+    run_cli(tests, args.verbosity)