Adding PRESUBMIT check on orphan headers files.

presubmit_checks_lib/check_orphan_headers_test.py

+# Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+import textwrap
+import unittest
+
+import check_orphan_headers
+
+
+class GetBuildGnPathFromFilePathTest(unittest.TestCase):
+
+  def testGetBuildGnFromSameDirectory(self):
+    file_path = '/home/projects/webrtc/base/foo.h'
+    expected_build_path = '/home/projects/webrtc/base/BUILD.gn'
+    file_exists = lambda p: p == '/home/projects/webrtc/base/BUILD.gn'
+    src_dir_path = '/home/projects/webrtc'
+    self.assertEqual(
+      expected_build_path,
+      check_orphan_headers.GetBuildGnPathFromFilePath(file_path,
+                                                      file_exists,
+                                                      src_dir_path))
+
+  def testGetBuildPathFromParentDirectory(self):
+    file_path = '/home/projects/webrtc/base/foo.h'
+    expected_build_path = '/home/projects/webrtc/BUILD.gn'
+    file_exists = lambda p: p == '/home/projects/webrtc/BUILD.gn'
+    src_dir_path = '/home/projects/webrtc'
+    self.assertEqual(
+      expected_build_path,
+      check_orphan_headers.GetBuildGnPathFromFilePath(file_path,
+                                                      file_exists,
+                                                      src_dir_path))
+
+  def testExceptionIfNoBuildGnFilesAreFound(self):
+    with self.assertRaises(check_orphan_headers.NoBuildGnFoundError):
+      file_path = '/home/projects/webrtc/base/foo.h'
+      file_exists = lambda p: False
+      src_dir_path = '/home/projects/webrtc'
+      check_orphan_headers.GetBuildGnPathFromFilePath(file_path,
+                                                      file_exists,
+                                                      src_dir_path)
+
+  def testExceptionIfFilePathIsNotAnHeader(self):
+    with self.assertRaises(check_orphan_headers.WrongFileTypeError):
+      file_path = '/home/projects/webrtc/base/foo.cc'
+      file_exists = lambda p: False
+      src_dir_path = '/home/projects/webrtc'
+      check_orphan_headers.GetBuildGnPathFromFilePath(file_path,
+                                                      file_exists,
+                                                      src_dir_path)
+
+
+class GetHeadersInBuildGnFileSourcesTest(unittest.TestCase):
+
+  def testEmptyFileReturnsEmptySet(self):
+    self.assertEqual(
+      set([]),
+      check_orphan_headers.GetHeadersInBuildGnFileSources('', '/a/b'))
+
+  def testReturnsSetOfHeadersFromFileContent(self):
+    file_content = textwrap.dedent("""
+                                   # Some comments

[kjellander_webrtc, 2017/05/08 18:52:00]

indenting this much looks kind of weird to me. Let's use the 4-space indent
style here.

[mbonadei, 2017/05/09 07:31:20]

Done.

+                                   if (is_android) {
+                                     import("//a/b/c.gni")
+                                     import("//d/e/f.gni")
+                                   }
+                                   source_set("foo") {
+                                     sources = ["foo.h"]

[kjellander_webrtc, 2017/05/08 18:52:00]

Can you add another header with the same name in a subdirectory? e.g.

source_set("baz_foo") {
  sources = ["baz/foo.h"]
}

And verify it works as expected.

[mbonadei, 2017/05/09 07:31:19]

Done.

+                                     deps = [":bar"]
+                                   }
+                                   rtc_static_library("bar") {
+                                     sources = [
+                                       "bar.h",
+                                       "bar.cc",
+                                     ]
+                                     deps = [":bar"]
+                                   }
+                                   """)
+    self.assertEqual(
+      set(['/a/b/foo.h', '/a/b/bar.h']),
+      check_orphan_headers.GetHeadersInBuildGnFileSources(file_content,
+                                                           '/a/b'))

[kjellander_webrtc, 2017/05/08 18:52:00]

alight with previous line's parenthesis (-1 space)

[mbonadei, 2017/05/09 07:31:19]

Done.

+

[kjellander_webrtc, 2017/05/08 18:52:00]

+1 blank line

[mbonadei, 2017/05/09 07:31:19]

Done.

+if __name__ == '__main__':
+  unittest.main()