build/dart/group_tests.py

#!/usr/bin/env python
# Copyright 2019 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import argparse
import os
import stat
import string
import sys

def main():
  parser = argparse.ArgumentParser(
      description='Generates a grouped dart test file from individual tests')
  parser.add_argument('--out',
                      help='Path to the invocation file to generate',
                      required=True)
  parser.add_argument('--source',
                      help='Path to a dart source file. Will be ignored if the file does not end in _test.dart',
                      action='append',
                      required=True)
  args = parser.parse_args()

  grouped_test = args.out
  grouped_test_dir = os.path.dirname(grouped_test)
  if not os.path.exists(grouped_test_dir):
    os.makedirs(grouped_test_dir)

  tests = filter(lambda src: src.endswith('_test.dart'), args.source)
  imports = ["import 'package:test/test.dart';"]
  invocations = []
  for test in tests:
    filename = os.path.splitext(os.path.basename(test))[0]
    imports.append("import '%s' as %s;" % (test, filename))
    invocations.append("group('%s', () => _delegate(%s.main, args));" % (filename, filename))

  contents = '''// DO NOT EDIT
// This script is generated by:
//   //topaz/runtime/dart/group_tests.py

%s

/// Wraps main invocations to support both main(List<String> args) and main().
void _delegate(Function f, List<String> args) {
  try {
    f(args);
  } on NoSuchMethodError catch(_) {
    f();
  }
}

void main(List<String> args) {
  %s
}''' % ('\n'.join(imports), '\n  '.join(invocations))

  with open(grouped_test, 'w') as file:
    file.write(contents)
  permissions = (stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR |
                 stat.S_IRGRP | stat.S_IWGRP | stat.S_IXGRP |
                 stat.S_IROTH)
  os.chmod(grouped_test, permissions)


if __name__ == '__main__':
  sys.exit(main())