From 64add0a02fc059b89d51e132ebee0917221a51ce Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 6 Jan 2026 06:24:14 +0000
Subject: [PATCH 1/3] Initial plan


From 8d563826ee2f6d0508f21f164070eeaa8c0244d4 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 6 Jan 2026 06:36:50 +0000
Subject: [PATCH 2/3] test: Add comprehensive tests for language-language
 (closes #54)

Co-authored-by: jade-codes <9397730+jade-codes@users.noreply.github.com>
---
 .../src/scanner/tests/tests_language.rs       | 76 +++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/crates/mother-core/src/scanner/tests/tests_language.rs b/crates/mother-core/src/scanner/tests/tests_language.rs
index 2894832..3477b2d 100644
--- a/crates/mother-core/src/scanner/tests/tests_language.rs
+++ b/crates/mother-core/src/scanner/tests/tests_language.rs
@@ -56,3 +56,79 @@ fn test_language_display() {
     assert_eq!(format!("{}", Language::SysML), "sysml");
     assert_eq!(format!("{}", Language::KerML), "kerml");
 }
+
+#[test]
+fn test_language_extensions() {
+    // Test that each language returns the correct extensions
+    assert_eq!(Language::Rust.extensions(), &["rs"]);
+    assert_eq!(Language::Python.extensions(), &["py"]);
+    assert_eq!(Language::TypeScript.extensions(), &["ts", "tsx"]);
+    assert_eq!(Language::JavaScript.extensions(), &["js", "jsx", "mjs", "cjs"]);
+    assert_eq!(Language::Go.extensions(), &["go"]);
+    assert_eq!(Language::SysML.extensions(), &["sysml"]);
+    assert_eq!(Language::KerML.extensions(), &["kerml"]);
+}
+
+#[test]
+fn test_extensions_consistency_with_from_extension() {
+    // Verify that all extensions returned by extensions() can be parsed by from_extension()
+    for language in [
+        Language::Rust,
+        Language::Python,
+        Language::TypeScript,
+        Language::JavaScript,
+        Language::Go,
+        Language::SysML,
+        Language::KerML,
+    ] {
+        for ext in language.extensions() {
+            assert_eq!(
+                Language::from_extension(ext),
+                Some(language),
+                "Extension '{}' should map to {:?}",
+                ext,
+                language
+            );
+        }
+    }
+}
+
+#[test]
+fn test_extensions_are_not_empty() {
+    // Ensure every language has at least one extension
+    for language in [
+        Language::Rust,
+        Language::Python,
+        Language::TypeScript,
+        Language::JavaScript,
+        Language::Go,
+        Language::SysML,
+        Language::KerML,
+    ] {
+        assert!(
+            !language.extensions().is_empty(),
+            "{:?} should have at least one extension",
+            language
+        );
+    }
+}
+
+#[test]
+fn test_extensions_multiple_for_typescript() {
+    // TypeScript should support both .ts and .tsx files
+    let extensions = Language::TypeScript.extensions();
+    assert_eq!(extensions.len(), 2);
+    assert!(extensions.contains(&"ts"));
+    assert!(extensions.contains(&"tsx"));
+}
+
+#[test]
+fn test_extensions_multiple_for_javascript() {
+    // JavaScript should support .js, .jsx, .mjs, and .cjs files
+    let extensions = Language::JavaScript.extensions();
+    assert_eq!(extensions.len(), 4);
+    assert!(extensions.contains(&"js"));
+    assert!(extensions.contains(&"jsx"));
+    assert!(extensions.contains(&"mjs"));
+    assert!(extensions.contains(&"cjs"));
+}

From fbe88a41dc7236e5d7541b431e551dadb59f526c Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 6 Jan 2026 06:42:37 +0000
Subject: [PATCH 3/3] style: Format code with rustfmt

Co-authored-by: jade-codes <9397730+jade-codes@users.noreply.github.com>
---
 crates/mother-core/src/scanner/tests/tests_language.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/crates/mother-core/src/scanner/tests/tests_language.rs b/crates/mother-core/src/scanner/tests/tests_language.rs
index 3477b2d..d0c9326 100644
--- a/crates/mother-core/src/scanner/tests/tests_language.rs
+++ b/crates/mother-core/src/scanner/tests/tests_language.rs
@@ -63,7 +63,10 @@ fn test_language_extensions() {
     assert_eq!(Language::Rust.extensions(), &["rs"]);
     assert_eq!(Language::Python.extensions(), &["py"]);
     assert_eq!(Language::TypeScript.extensions(), &["ts", "tsx"]);
-    assert_eq!(Language::JavaScript.extensions(), &["js", "jsx", "mjs", "cjs"]);
+    assert_eq!(
+        Language::JavaScript.extensions(),
+        &["js", "jsx", "mjs", "cjs"]
+    );
     assert_eq!(Language::Go.extensions(), &["go"]);
     assert_eq!(Language::SysML.extensions(), &["sysml"]);
     assert_eq!(Language::KerML.extensions(), &["kerml"]);