Bug 910660 - Add a test for the unpacker code. r=gps

python/moz.build

@@ -74,6 +74,7 @@ PYTHON_UNIT_TESTS += [
     'mozbuild/mozpack/test/test_packager.py',
     'mozbuild/mozpack/test/test_packager_formats.py',
     'mozbuild/mozpack/test/test_packager_l10n.py',
+    'mozbuild/mozpack/test/test_packager_unpack.py',
     'mozbuild/mozpack/test/test_path.py',
     'mozbuild/mozpack/test/test_unify.py',
 ]

python/mozbuild/mozpack/packager/unpack.py

@@ -160,15 +160,24 @@ class UnpackFinder(FileFinder):
         return mozpack.path.join(base, jar), entry
 
 
+def unpack_to_registry(source, registry):
+    '''
+    Transform a jar chrome or omnijar packaged directory into a flat package.
+
+    The given registry is filled with the flat package.
+    '''
+    finder = UnpackFinder(source)
+    packager = SimplePackager(FlatFormatter(registry))
+    for p, f in finder.find('*'):
+        if mozpack.path.split(p)[0] not in STARTUP_CACHE_PATHS:
+            packager.add(p, f)
+    packager.close()
+
+
 def unpack(source):
     '''
     Transform a jar chrome or omnijar packaged directory into a flat package.
     '''
     copier = FileCopier()
-    finder = UnpackFinder(source)
-    packager = SimplePackager(FlatFormatter(copier))
-    for p, f in finder.find('*'):
-        if mozpack.path.split(p)[0] not in STARTUP_CACHE_PATHS:
-            packager.add(p, f)
-    packager.close()
+    unpack_to_registry(source, copier)
     copier.copy(source, skip_if_older=False)

python/mozbuild/mozpack/test/test_packager_formats.py

@@ -73,7 +73,7 @@ def fill_formatter(formatter, contents):
             formatter.add(k, v)
 
 
-def get_contents(registry):
+def get_contents(registry, read_all=False):
     result = {}
     for k, v in registry:
         if k.endswith('.xpt'):
@@ -82,7 +82,7 @@ def get_contents(registry):
             result[k] = read_interfaces(tmpfile)
         elif isinstance(v, FileRegistry):
             result[k] = get_contents(v)
-        elif isinstance(v, ManifestFile):
+        elif isinstance(v, ManifestFile) or read_all:
             result[k] = v.open().read().splitlines()
         else:
             result[k] = v

python/mozbuild/mozpack/test/test_packager_unpack.py

@@ -0,0 +1,65 @@
+# 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 mozunit
+from mozpack.packager.formats import (
+    FlatFormatter,
+    JarFormatter,
+    OmniJarFormatter,
+)
+from mozpack.packager.unpack import unpack_to_registry
+from mozpack.copier import (
+    FileCopier,
+    FileRegistry,
+)
+from mozpack.test.test_packager_formats import (
+    CONTENTS,
+    fill_formatter,
+    get_contents,
+)
+from mozpack.test.test_files import TestWithTmpDir
+
+
+class TestUnpack(TestWithTmpDir):
+    maxDiff = None
+
+    @staticmethod
+    def _get_copier(cls):
+        copier = FileCopier()
+        formatter = cls(copier)
+        fill_formatter(formatter, CONTENTS)
+        return copier
+
+    @classmethod
+    def setUpClass(cls):
+        cls.contents = get_contents(cls._get_copier(FlatFormatter),
+                                    read_all=True)
+
+    def _unpack_test(self, cls):
+        # Format a package with the given formatter class
+        copier = self._get_copier(cls)
+        copier.copy(self.tmpdir)
+
+        # Unpack that package. Its content is expected to match that of a Flat
+        # formatted package.
+        registry = FileRegistry()
+        unpack_to_registry(self.tmpdir, registry)
+        self.assertEqual(get_contents(registry, read_all=True), self.contents)
+
+    def test_flat_unpack(self):
+        self._unpack_test(FlatFormatter)
+
+    def test_jar_unpack(self):
+        self._unpack_test(JarFormatter)
+
+    def test_omnijar_unpack(self):
+        class OmniFooFormatter(OmniJarFormatter):
+            def __init__(self, registry):
+                super(OmniFooFormatter, self).__init__(registry, 'omni.foo')
+
+        self._unpack_test(OmniFooFormatter)
+
+
+if __name__ == '__main__':
+    mozunit.main()