Add regression test

fixtures/TEST_LOCAL_DIRECTORIES.md

@@ -0,0 +1,6 @@
+The following links should all be valid and be detected as such by lychee.
+
+[link to root dir](file:///)
+[link to /dev](file:///dev/)
+[link to current dir](.)
+[relative link to docs](../docs/)

lychee-bin/tests/cli.rs

@@ -280,6 +280,18 @@ mod cli {
         )
     }
 
+    #[test]
+    fn test_local_directories() -> Result<()> {
+        test_json_output!(
+            "TEST_LOCAL_DIRECTORIES.md",
+            MockResponseStats {
+                total: 4,
+                successful: 4,
+                ..MockResponseStats::default()
+            }
+        )
+    }
+
     #[test]
     fn test_email() -> Result<()> {
         test_json_output!(