Add unit tests for dev extension category filtering

Co-Authored-By: Claude <noreply@anthropic.com>

Author: chenwuji2000-cyber

crates/extensions_ui/src/extensions_ui.rs

@@ -1903,3 +1903,79 @@ fn dev_extension_matches_provides(
         ExtensionProvides::DebugAdapters => !manifest.debug_adapters.is_empty(),
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use extension::SchemaVersion;
+    use std::path::PathBuf;
+
+    fn empty_manifest() -> ExtensionManifest {
+        ExtensionManifest {
+            id: "test".into(),
+            name: "Test".to_string(),
+            version: "1.0.0".into(),
+            schema_version: SchemaVersion::ZERO,
+            description: None,
+            repository: None,
+            authors: vec![],
+            lib: Default::default(),
+            themes: vec![],
+            icon_themes: vec![],
+            languages: vec![],
+            grammars: BTreeMap::default(),
+            language_servers: BTreeMap::default(),
+            context_servers: BTreeMap::default(),
+            agent_servers: BTreeMap::default(),
+            slash_commands: BTreeMap::default(),
+            snippets: None,
+            capabilities: vec![],
+            debug_adapters: Default::default(),
+            debug_locators: Default::default(),
+            language_model_providers: BTreeMap::default(),
+        }
+    }
+
+    fn dev_extension_visible(
+        manifest: &ExtensionManifest,
+        provides_filter: Option<ExtensionProvides>,
+    ) -> bool {
+        match provides_filter {
+            Some(provides) => dev_extension_matches_provides(manifest, provides),
+            None => true,
+        }
+    }
+
+    #[test]
+    fn test_dev_extension_shown_without_category_filter() {
+        let theme_extension = ExtensionManifest {
+            themes: vec![PathBuf::from("themes/dark.json")],
+            ..empty_manifest()
+        };
+        assert!(dev_extension_visible(&theme_extension, None));
+    }
+
+    #[test]
+    fn test_dev_extension_hidden_when_category_does_not_match() {
+        let theme_extension = ExtensionManifest {
+            themes: vec![PathBuf::from("themes/dark.json")],
+            ..empty_manifest()
+        };
+        assert!(!dev_extension_visible(
+            &theme_extension,
+            Some(ExtensionProvides::Languages),
+        ));
+    }
+
+    #[test]
+    fn test_dev_extension_shown_when_category_matches() {
+        let theme_extension = ExtensionManifest {
+            themes: vec![PathBuf::from("themes/dark.json")],
+            ..empty_manifest()
+        };
+        assert!(dev_extension_visible(
+            &theme_extension,
+            Some(ExtensionProvides::Themes),
+        ));
+    }
+}