test-lib: Drastically simplify by using test_handler function.

This automatically enables use of the pytest runner using common code.

tools/test-lib

@@ -1,51 +1,6 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
 
-import os
-import sys
-import unittest
-import argparse
-
-from importlib import import_module
-
-def parse_args():
-    parser = argparse.ArgumentParser()
-    parser.add_argument('--coverage',
-                        nargs='?',
-                        const=True,
-                        default=False,
-                        help='compute test coverage ("--coverage combine" to combine with previous reports)')
-    return parser.parse_args()
-
-def run_all():
-    TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))
-    ROOT_DIR = os.path.abspath(os.path.join(TOOLS_DIR, '..'))
-    BOTS_DIR = os.path.join(ROOT_DIR, 'zulib_bots')
-    sys.path.insert(0, BOTS_DIR)
-
-    options = parse_args()
-
-    if options.coverage:
-        import coverage
-        cov = coverage.Coverage(config_file="tools/.coveragerc")
-        if options.coverage == 'combine':
-            cov.load()
-        cov.start()
-
-    module = 'zulip_bots/zulip_bots/tests/'
-    suite = unittest.defaultTestLoader.discover(module)
-
-    suite = unittest.TestSuite([suite])
-    runner = unittest.TextTestRunner(verbosity=2)
-    result = runner.run(suite)
-    if result.failures or result.errors:
-        sys.exit(1)
-
-    if not result.failures and options.coverage:
-        cov.stop()
-        cov.data_suffix = False  # Disable suffix so that filename is .coverage
-        cov.save()
-        cov.html_report()
-        print("HTML report saved under directory 'htmlcov'.")
+from server_lib.test_handler import handle_input_and_run_tests_for_package
 
 if __name__ == '__main__':
-    run_all()
+    handle_input_and_run_tests_for_package('Bot library', ['zulip_bots', 'zulip_bots', 'tests'])