diff --git a/tests/test_changes.py b/tests/test_changes.py
new file mode 100644
index 0000000..784eaec
--- /dev/null
+++ b/tests/test_changes.py
@@ -0,0 +1,97 @@
+import unittest
+from gitinspector import changes
+
+
+FAKE_FILE_NAME = 'Arbitrary.ext'
+FAKE_COMMIT_STRING = "1614563270|2021-02-28|53d81bcd2612dbc47e73c71ee43baae83c1ec252|JP White|jpwhite3@gmail.com"
+
+
+class TestAuthorInfo(unittest.TestCase):
+
+    def test_AuthorInfo_attrs(self):
+        author = changes.AuthorInfo()
+        expected_email = None
+        expected_insertions = 0
+        expected_deletions = 0
+        expected_commits = 0
+        self.assertEqual(expected_email, author.email)
+        self.assertEqual(expected_insertions, author.insertions)
+        self.assertEqual(expected_deletions, author.deletions)
+        self.assertEqual(expected_commits, author.commits)
+
+
+class TestFileDiff(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        pass
+
+    def setUp(self):
+        pass
+
+    def test_FileDiff_init(self):
+        test_string = 'ArbitraryName|-++-+'
+        file_diff = changes.FileDiff(test_string)
+        expected_name = 'ArbitraryName'
+        self.assertEqual(expected_name, file_diff.name)
+        expected_insertions = 3
+        self.assertEqual(expected_insertions, file_diff.insertions)
+        expected_deletions = 2
+        self.assertEqual(expected_deletions, file_diff.deletions)
+
+    def test_is_not_filediff_line(self):
+        actual = changes.FileDiff.is_filediff_line(FAKE_FILE_NAME)
+        self.assertFalse(actual)
+
+    def test_is_filediff_line(self):
+        test_file_diff_string = "arbitrary|--- a/file.txt"
+        actual = changes.FileDiff.is_filediff_line(test_file_diff_string)
+        self.assertTrue(actual)
+
+    def test_get_extension(self):
+        expected = 'ext'
+        actual = changes.FileDiff.get_extension(FAKE_FILE_NAME)
+        self.assertEqual(actual, expected)
+
+    def test_get_extension_from_file_without_extension(self):
+        test_file_name = 'Arbitrary'
+        expected = ''
+        actual = changes.FileDiff.get_extension(test_file_name)
+        self.assertEqual(actual, expected)
+
+    def test_get_filename(self):
+        expected = FAKE_FILE_NAME
+        actual = changes.FileDiff.get_filename(expected)
+        self.assertEqual(actual, expected)
+
+    def test_is_not_valid_extension(self):
+        result = changes.FileDiff.is_valid_extension(FAKE_FILE_NAME)
+        self.assertFalse(result)
+
+    def test_is_valid_extension(self):
+        test_file_name = 'Arbitrary.cpp'
+        result = changes.FileDiff.is_valid_extension(test_file_name)
+        self.assertTrue(result)
+
+
+class TestCommitClass(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        pass
+
+    def setUp(self):
+        pass
+
+    def test_Commit_init(self):
+        commit = changes.Commit(FAKE_COMMIT_STRING)
+        expected_timestamp = '1614563270'
+        expected_date = '2021-02-28'
+        expected_sha = '53d81bcd2612dbc47e73c71ee43baae83c1ec252'
+        expected_author = 'JP White'
+        expected_email = 'jpwhite3@gmail.com'
+        self.assertEqual(expected_timestamp, commit.timestamp)
+        self.assertEqual(expected_date, commit.date)
+        self.assertEqual(expected_sha, commit.sha)
+        self.assertEqual(expected_author, commit.author)
+        self.assertEqual(expected_email, commit.email)
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