diff --git a/tests/test_closed.diff b/tests/test_closed.diff
index d7190f1..f49f688 100644
--- a/tests/test_closed.diff
+++ b/tests/test_closed.diff
@@ -222,3 +222,16 @@ index 525e25d..ba4e68d 100644
 -   also need to be turned into todos, and hopefully
 -   kept together as one todo
 - #}
+diff --git a/tests/example_file.py b/tests/example_file.R
+index 525e25d..ba4e68d 100644
+--- a/tests/example_file.R
++++ b/tests/example_file.R
+@@ -1,23 +1,2 @@
+hello_world <- function() {
+-    # TODO: Come up with a more imaginative greeting
+     message("Hello world")
+-
+-    # TODO: Do more stuff
+-    #  This function should probably do something more interesting
+-    #  labels: help wanted
+
diff --git a/tests/test_new.diff b/tests/test_new.diff
index 690698e..6df3bae 100644
--- a/tests/test_new.diff
+++ b/tests/test_new.diff
@@ -232,3 +232,17 @@ index 0000000..7cccc5b
 +   also need to be turned into todos, and hopefully
 +   kept together as one todo
 + #}
+diff --git a/tests/example_file.py b/tests/example_file.R
+new file mode 100644
+index 0000000..525e25d
+--- /dev/null
++++ b/tests/example_file.R
+@@ -0,0 +1,23 @@
++hello_world <- function() {
++    # TODO: Come up with a more imaginative greeting
++    message("Hello world")
++
++    # TODO: Do more stuff
++    #  This function should probably do something more interesting
++    #  labels: help wanted
++}
\ No newline at end of file
diff --git a/tests/test_todo_parser.py b/tests/test_todo_parser.py
index 2c1e671..f02c8f5 100644
--- a/tests/test_todo_parser.py
+++ b/tests/test_todo_parser.py
@@ -64,6 +64,9 @@ class NewIssueTests(unittest.TestCase):
     def test_twig_issues(self):
         self.assertEqual(count_issues_for_file_type(self.raw_issues, 'twig'), 2)
 
+    def test_r_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'r'), 2)
+
 
 class ClosedIssueTests(unittest.TestCase):
     # Check for removed TODOs across the files specified.
@@ -117,6 +120,8 @@ class ClosedIssueTests(unittest.TestCase):
     def test_twig_issues(self):
         self.assertEqual(count_issues_for_file_type(self.raw_issues, 'twig'), 2)
 
+    def test_r_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'r'), 2)
 
 class IgnorePatternTests(unittest.TestCase):