diff --git a/src/directory/Walk_test.go b/src/directory/Walk_test.go
index a4fcda8..f3f64cf 100644
--- a/src/directory/Walk_test.go
+++ b/src/directory/Walk_test.go
@@ -17,3 +17,8 @@ func TestWalk(t *testing.T) {
 	assert.Contains(t, files, "Walk.go")
 	assert.Contains(t, files, "Walk_test.go")
 }
+
+func TestNonExisting(t *testing.T) {
+	err := directory.Walk("does-not-exist", func(file string) {})
+	assert.NotNil(t, err)
+}