diff --git a/tests/test_gravatar.py b/tests/test_gravatar.py
new file mode 100644
index 0000000..7cacbb7
--- /dev/null
+++ b/tests/test_gravatar.py
@@ -0,0 +1,13 @@
+import unittest
+from gitinspector import gravatar
+
+TEST_STRING = 'arbitrary'
+
+
+class TestGravatar(unittest.TestCase):
+
+    def test_get_url(self):
+        expected_url = 'https://www.gravatar.com/avatar/c181b12d45d1fd849f885221f3ee3f39?default=identicon'
+        arbitrary_email = TEST_STRING + '@example.com'
+        actual_url = gravatar.get_url(arbitrary_email)
+        self.assertEqual(expected_url, actual_url)
diff --git a/tests/test_interval.py b/tests/test_interval.py
new file mode 100644
index 0000000..d34a377
--- /dev/null
+++ b/tests/test_interval.py
@@ -0,0 +1,22 @@
+import unittest
+from gitinspector import interval
+
+TEST_STRING = 'arbitrary'
+
+
+class TestInterval(unittest.TestCase):
+
+    def test_has_interval(self):
+        actual = interval.has_interval()
+        self.assertFalse(actual)
+
+    def test_get_since(self):
+        expected = ''
+        actual = interval.get_since()
+        self.assertEqual(expected, actual)
+
+    def test_set_since(self):
+        expected = '--since=' + TEST_STRING
+        interval.set_since(TEST_STRING)
+        actual = interval.get_since()
+        self.assertEqual(expected, actual)