#51 - adds method TagIndex.empty

2 files changed, 10 insertions, 0 deletions

diff --git a/service/pixelated/adapter/tag_index.py b/service/pixelated/adapter/tag_index.py
index ea69be1a..bac3c6a6 100644
--- a/service/pixelated/adapter/tag_index.py
+++ b/service/pixelated/adapter/tag_index.py
@@ -44,6 +44,9 @@ class TagIndex:
         else:
             return None
 
+    def empty(self):
+        return len(self.db.keys()) == 0
+
     def values(self):
         return set(self.get(key) for key in self.db.keys())
 
diff --git a/service/test/adapter/tag_index_test.py b/service/test/adapter/tag_index_test.py
index 05f7ce55..525bf0d6 100644
--- a/service/test/adapter/tag_index_test.py
+++ b/service/test/adapter/tag_index_test.py
@@ -61,3 +61,10 @@ class TestTagIndex(unittest.TestCase):
         self.tag_index.add(same_name_tag)
 
         self.assertEquals(True, self.tag_index.get('tag').default)
+
+    def test_empty_returns_true_if_there_are_no_values(self):
+        self.assertTrue(self.tag_index.empty())
+
+    def test_empty_returns_false_if_there_are_values(self):
+        self.tag_index.set(Tag('tag'))
+        self.assertFalse(self.tag_index.empty())