Write an actual test for resource_loader_test

Exercise the code paths it triggers.

Disable it on windows and pip packages for now.

PiperOrigin-RevId: 293910406
Change-Id: Ie84a3a85ff1f471e3d7ed4b192701667481e8324

tensorflow/python/BUILD

@@ -285,7 +285,14 @@ tf_py_test(
     name = "resource_loader_test",
     size = "small",
     srcs = ["platform/resource_loader_test.py"],
+    data = [
+        "platform/resource_loader.py",
+    ],
     python_version = "PY3",
+    tags = [
+        "no_pip",
+        "no_windows",
+    ],
     deps = [
         ":platform",
         ":platform_test",

tensorflow/python/platform/resource_loader_test.py

@@ -21,11 +21,17 @@ from tensorflow.python.platform import googletest
 from tensorflow.python.platform import resource_loader
 
 
-class DefaultResourceLoaderTest(googletest.TestCase):
+class ResourceLoaderTest(googletest.TestCase):
 
   def test_exception(self):
     with self.assertRaises(IOError):
       resource_loader.load_resource("/fake/file/path/dne")
 
+  def test_exists(self):
+    contents = resource_loader.load_resource(
+        "python/platform/resource_loader.py")
+    self.assertIn(b"tensorflow", contents)
+
+
 if __name__ == "__main__":
   googletest.main()