diff --git a/test/test_all.py b/test/test_all.py
index 7341a6e..7c705e8 100644
--- a/test/test_all.py
+++ b/test/test_all.py
@@ -19,6 +19,7 @@ from test_contributors import TestContributors
 from test_cyrillic_convert import TestCyrillicConvert
 from test_playerInspect import TestPlayerInspect
 from test_regionTrimmer import TestRegionTrimmer
+from test_testRender import TestTestRender
 
 # DISABLE THIS BLOCK TO GET LOG OUTPUT FROM TILESET FOR DEBUGGING
 if 0:
diff --git a/test/test_testRender.py b/test/test_testRender.py
new file mode 100644
index 0000000..96a701a
--- /dev/null
+++ b/test/test_testRender.py
@@ -0,0 +1,108 @@
+import tempfile
+import unittest
+from unittest.mock import patch
+from subprocess import CalledProcessError, PIPE, STDOUT
+import contrib.testRender as test_render
+from io import StringIO
+from shlex import split
+
+
+class TestTestRender(unittest.TestCase):
+    @patch("contrib.testRender.run")
+    def test_check_call_raises_CalledProcessError_from_subprocess_run(self, m_run):
+        m_run.side_effect = CalledProcessError(1, "python program.js")
+        with self.assertRaises(CalledProcessError):
+            test_render.check_call(["python", "program.js"])
+
+    @patch("contrib.testRender.run")
+    def test_check_call_captures_stdout_if_not_verbose(self, m_run):
+        test_render.check_call(["python", "program.py"])
+        args, kwargs = m_run.call_args
+        self.assertEqual(kwargs['stdout'], PIPE)
+        self.assertEqual(kwargs['stderr'], STDOUT)
+
+    @patch("contrib.testRender.run")
+    def test_check_call_does_not_capture_stdout_if_verbose(self, m_run):
+        test_render.check_call(["python", "program.py"], verbose=True)
+        args, kwargs = m_run.call_args
+        self.assertEqual(kwargs['stdout'], None)
+        self.assertEqual(kwargs['stderr'], None)
+
+    @patch('sys.stdout', new_callable=StringIO)
+    @patch("contrib.testRender.run")
+    def test_check_call_prints_exception_output_if_verbose(self, m_run, m_out):
+        m_run.side_effect = CalledProcessError(
+            1, "python program.js", output="SyntaxError: invalid syntax")
+        with self.assertRaises(CalledProcessError):
+            test_render.check_call(["python", "program.js"], verbose=True)
+        self.assertEqual(m_out.getvalue().strip(), "SyntaxError: invalid syntax")
+
+    @patch("contrib.testRender.run")
+    def test_check_output_captures_stdout(self, m_run):
+        test_render.check_call(["python", "program.py"])
+        args, kwargs = m_run.call_args
+        self.assertEqual(kwargs['stdout'], PIPE)
+
+    @patch('contrib.testRender.check_output')
+    def test_get_commits(self, m_check_output):
+        gitrange = '2eca1a5fb5fa7eeb5494abb350cd535f67acfb8b..08a86a52abfabd59ac68b37dc7e5270bd7fb328a'
+        m_check_output.return_value = (
+            "commit 2eca1a5fb5fa7eeb5494abb350cd535f67acfb8b\nAuthor: Andrew "
+            "<andrew@fry.(none)>\nDate:   Sun Aug 22 10:16:10 2010 -0400\n\n "
+            "   initial comit\n\n:000000 100644 0000000 c398ada A\tchunk.py\n:000000 "
+            "100644 0000000 d5ee6ed A\tnbt.py\n:000000 100644 0000000 8fc65c9 A\ttextures.py\n:"
+            "000000 100644 0000000 6934326 A\tworld.py\n\ncommit 08a86a52abfabd59ac68b37dc7e5270bd7fb328a"
+            "\nAuthor: Andrew <andrew@fry.(none)>\nDate:   Tue Aug 24 21:11:57 2010 -0400\n\n    "
+            "uses multiprocessing to speed up rendering. Caches chunks\n\n:1"
+        )
+
+        result = list(test_render.get_commits(gitrange))
+        self.assertListEqual(result, ['2eca1a5fb5fa7eeb5494abb350cd535f67acfb8b',
+                                      '08a86a52abfabd59ac68b37dc7e5270bd7fb328a'])
+
+    @patch('contrib.testRender.check_output', return_value="my-feature-branch")
+    def test_get_current_branch(self, m_check_output):
+        self.assertEqual(test_render.get_current_branch(), "my-feature-branch")
+
+    @patch('contrib.testRender.check_output', return_value="HEAD")
+    def test_get_current_branch_returns_none_for_detached_head(self, m_check_output):
+        self.assertIsNone(test_render.get_current_branch())
+
+    @patch('contrib.testRender.check_output', return_value="3f1f3d748e1c79843279ba18ab65a34368b95b67")
+    def test_get_current_commit(self, m_check_output):
+        self.assertEqual(
+            test_render.get_current_branch(),
+            "3f1f3d748e1c79843279ba18ab65a34368b95b67"
+        )
+
+    @patch('contrib.testRender.get_current_branch', return_value="my-feature-branch")
+    def test_get_current_ref_returns_branch_name_if_possible(self, m_branch):
+        self.assertEqual(test_render.get_current_ref(), "my-feature-branch")
+
+    @patch('contrib.testRender.get_current_commit', return_value="3f1f3d748e1c79843279ba18ab65a34368b95b67")
+    @patch('contrib.testRender.get_current_branch', return_value=None)
+    def test_get_current_ref_returns_current_commit_if_no_branch(self, m_branch, m_commit):
+        self.assertEqual(
+            test_render.get_current_ref(),
+            "3f1f3d748e1c79843279ba18ab65a34368b95b67"
+        )
+
+    @patch('contrib.testRender.check_output')
+    def test_get_commits(self, m_check_output):
+        m_check_output.return_value = "\n".join(
+            [
+                "41ceaeab58473416bb79680ab21211764e6f1908",
+                "a4d0daa91c25a51ca95182301e503c020900dafe",
+                "05906c81f5778a543dfab14e77231db0a99bae24",
+            ]
+        )
+        gitrange = "41ceaeab58473416bb79680ab21211764e6f1908..05906c81f5778a543dfab14e77231db0a99bae24"
+        result = list(test_render.get_commits(gitrange))
+        self.assertListEqual(
+            result,
+            [
+                "41ceaeab58473416bb79680ab21211764e6f1908",
+                "a4d0daa91c25a51ca95182301e503c020900dafe",
+                "05906c81f5778a543dfab14e77231db0a99bae24"
+            ]
+        )