1 files changed, 104 insertions, 0 deletions
diff --git a/config/tests/test_mozbuild_reading.py b/config/tests/test_mozbuild_reading.py
new file mode 100644
index 0000000000..17fecf1452
--- /dev/null
+++ b/config/tests/test_mozbuild_reading.py
@@ -0,0 +1,104 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import sys
+import unittest
+
+from mozbuild.base import MozbuildObject
+from mozbuild.frontend.context import Files
+from mozbuild.frontend.reader import BuildReader, EmptyConfig
+from mozpack.files import FileFinder
+from mozunit import main
+
+
+class TestMozbuildReading(unittest.TestCase):
+    # This hack is needed to appease running in automation.
+    def setUp(self):
+        self._old_env = dict(os.environ)
+        os.environ.pop("MOZCONFIG", None)
+        os.environ.pop("MOZ_OBJDIR", None)
+
+    def tearDown(self):
+        os.environ.clear()
+        os.environ.update(self._old_env)
+
+    def _mozbuilds(self, reader):
+        if not hasattr(self, "_mozbuild_paths"):
+            self._mozbuild_paths = set(reader.all_mozbuild_paths())
+
+        return self._mozbuild_paths
+
+    @unittest.skip("failing in SpiderMonkey builds")
+    def test_filesystem_traversal_reading(self):
+        """Reading moz.build according to filesystem traversal works.
+
+        We attempt to read every known moz.build file via filesystem traversal.
+
+        If this test fails, it means that metadata extraction will fail.
+        """
+        mb = MozbuildObject.from_environment(detect_virtualenv_mozinfo=False)
+        config = mb.config_environment
+        reader = BuildReader(config)
+        all_paths = self._mozbuilds(reader)
+        paths, contexts = reader.read_relevant_mozbuilds(all_paths)
+        self.assertEqual(set(paths), all_paths)
+        self.assertGreaterEqual(len(contexts), len(paths))
+
+    def test_filesystem_traversal_no_config(self):
+        """Reading moz.build files via filesystem traversal mode with no build config.
+
+        This is similar to the above test except no build config is applied.
+        This will likely fail in more scenarios than the above test because a
+        lot of moz.build files assumes certain variables are present.
+        """
+        here = os.path.abspath(os.path.dirname(__file__))
+        root = os.path.normpath(os.path.join(here, "..", ".."))
+        config = EmptyConfig(root)
+        reader = BuildReader(config)
+        all_paths = self._mozbuilds(reader)
+        paths, contexts = reader.read_relevant_mozbuilds(all_paths)
+        self.assertEqual(set(paths.keys()), all_paths)
+        self.assertGreaterEqual(len(contexts), len(paths))
+
+    def test_orphan_file_patterns(self):
+        if sys.platform == "win32":
+            raise unittest.SkipTest("failing on windows builds")
+
+        mb = MozbuildObject.from_environment(detect_virtualenv_mozinfo=False)
+
+        try:
+            config = mb.config_environment
+        except Exception as e:
+            if str(e) == "config.status not available. Run configure.":
+                raise unittest.SkipTest("failing without config.status")
+            raise
+
+        if config.substs["MOZ_BUILD_APP"] == "js":
+            raise unittest.SkipTest("failing in Spidermonkey builds")
+
+        reader = BuildReader(config)
+        all_paths = self._mozbuilds(reader)
+        _, contexts = reader.read_relevant_mozbuilds(all_paths)
+
+        finder = FileFinder(config.topsrcdir, ignore=["obj*"])
+
+        def pattern_exists(pat):
+            return [p for p in finder.find(pat)] != []
+
+        for ctx in contexts:
+            if not isinstance(ctx, Files):
+                continue
+            relsrcdir = ctx.relsrcdir
+            for p in ctx.patterns:
+                if not pattern_exists(os.path.join(relsrcdir, p)):
+                    self.fail(
+                        "The pattern '%s' in a Files() entry in "
+                        "'%s' corresponds to no files in the tree.\n"
+                        "Please update this entry." % (p, ctx.main_path)
+                    )
+
+
+if __name__ == "__main__":
+    main()