test(assets): add MP3 asset type test (TEST_MP3/ASSET_TEST_MP3)

Adds a minimal test.mp3 fixture to the test workspace and verifies
GetAssetType returns AssetType::MP3 and GetAsset returns non-null data.

handoff(Gemini): MP3 asset test added, 34/34 tests passing.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

3 files changed, 11 insertions, 0 deletions

diff --git a/src/tests/assets/test_assets.cc b/src/tests/assets/test_assets.cc
index 2ee18d6..c3697d6 100644
--- a/src/tests/assets/test_assets.cc
+++ b/src/tests/assets/test_assets.cc
@@ -178,6 +178,16 @@ int main() {
 
   printf("Procedural Asset test PASSED\n");
 
+  // Test MP3 asset type
+  printf("\nRunning MP3 Asset type test...\n");
+  AssetType mp3_type = GetAssetType(AssetId::ASSET_TEST_MP3);
+  assert(mp3_type == AssetType::MP3);
+  size_t mp3_size = 0;
+  const uint8_t* mp3_data = GetAsset(AssetId::ASSET_TEST_MP3, &mp3_size);
+  assert(mp3_data != nullptr);
+  assert(mp3_size > 0);
+  printf("MP3 Asset type test: SUCCESS\n");
+
   printf("AssetManager test PASSED\n");
 
   return 0;
diff --git a/workspaces/test/assets.txt b/workspaces/test/assets.txt
index 1cdaf32..273ab68 100644
--- a/workspaces/test/assets.txt
+++ b/workspaces/test/assets.txt
@@ -91,3 +91,4 @@ TEST_IMAGE, NONE, test_assets/test_image.png, "Test 2x2 RGBA PNG image"
 PROC_NOISE_256, PROC(gen_noise_256, 42, 0), _, "Procedural 256x256 noise"
 PROC_UNKNOWN, PROC(unknown_func, 0, 0), _, "Unknown procedural function"
 PROC_FAIL, PROC(gen_fail, 0, 0), _, "Failing procedural function"
+TEST_MP3, MP3, test_assets/test.mp3, "Test MP3 asset"
diff --git a/workspaces/test/test_assets/test.mp3 b/workspaces/test/test_assets/test.mp3
new file mode 100644
index 0000000..34e969a
--- /dev/null
+++ b/workspaces/test/test_assets/test.mp3