Adding PRESUBMIT check on orphan headers files.

tools_webrtc/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 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 = """
+    # Some comments
+    if (is_android) {
+      import("//a/b/c.gni")
+      import("//d/e/f.gni")
+    }
+    source_set("foo") {
+      sources = ["foo.h"]
+      deps = [":bar"]
+    }
+    rtc_static_library("bar") {
+      sources = [
+        "bar.h",
+        "bar.cc",
+      ]
+      deps = [":bar"]
+    }
+    source_set("baz_foo") {
+      sources = ["baz/foo.h"]
+    }
+    """
+    self.assertEqual(
+      set(['/a/b/foo.h', '/a/b/bar.h', '/a/b/baz/foo.h']),
+      check_orphan_headers.GetHeadersInBuildGnFileSources(file_content,
+                                                          '/a/b'))
+
+
+if __name__ == '__main__':
+  unittest.main()