ignore/types: add automated test for sortedness

Author: arbrauns

crates/ignore/src/default_types.rs

@@ -290,3 +290,22 @@ pub const DEFAULT_TYPES: &[(&str, &[&str])] = &[
     ]),
     ("zstd", &["*.zst", "*.zstd"]),
 ];
+
+#[test]
+fn test_default_types_are_sorted() {
+    let mut names = DEFAULT_TYPES.iter().map(|(name, _exts)| name);
+
+    if let Some(first) = names.next() {
+        let mut previous_name = first;
+        for name in names {
+            assert!(
+                name > previous_name,
+                r#""{}" should be sorted before "{}" in `DEFAULT_TYPES`"#,
+                name,
+                previous_name
+            );
+
+            previous_name = name;
+        }
+    }
+}