Extend unittest to test follow-module behavior of find_dependencies.py

tools/telemetry/telemetry/internal/util/find_dependencies_unittest.py

Index: tools/telemetry/telemetry/internal/util/find_dependencies_unittest.py
diff --git a/tools/telemetry/telemetry/internal/util/find_dependencies_unittest.py b/tools/telemetry/telemetry/internal/util/find_dependencies_unittest.py
index 8afd21c78e0cb9b65fc49e5565157a058fb7604a..7d43915e042c00021da0a414770a870764ec1781 100644
--- a/tools/telemetry/telemetry/internal/util/find_dependencies_unittest.py
+++ b/tools/telemetry/telemetry/internal/util/find_dependencies_unittest.py
@@ -22,3 +22,17 @@ class FindDependenciesTest(unittest.TestCase):
     self.assertEquals(
       set(p for p in find_dependencies.FindPythonDependencies(dog_object_path)),
       {dog_object_path, cat_module_path, cat_module_init_path, cat_object_path})
+
+  def testFindPythonDependenciesWithNestedImport(self):
+    moose_module_path = os.path.join(
+        util.GetUnittestDataDir(),
+        'dependency_test_dir', 'other_animals', 'moose', 'moose')
+    moose_object_path = os.path.join(moose_module_path, 'moose_object.py')
+    horn_module_path = os.path.join(moose_module_path, 'horn')
+    horn_module_init_path = os.path.join(horn_module_path, '__init__.py')
+    horn_object_path = os.path.join(horn_module_path, 'horn_object.py')
+    self.assertEquals(
+      set(p for p in
+        find_dependencies.FindPythonDependencies(moose_object_path)),
+      {moose_object_path,
+        horn_module_path, horn_module_init_path, horn_object_path})