Factor common test patterns into reusable utilitiesHEADmain

Refactor duplicated test setup/teardown code into shared fixtures:
- test_math_helpers.h: Float comparison (test_near, test_near_vec3)
- AudioTestFixture: RAII wrapper for AudioEngine lifecycle
- EffectTestFixture: Combined WebGPU + AudioEngine + MainSequence

Migrated 9 test files (3 math, 6 audio) to use fixtures.
Net reduction: 54 LOC (178 insertions, 232 deletions).

All 34 tests passing.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 11 insertions, 14 deletions

diff --git a/src/tests/audio/test_tracker.cc b/src/tests/audio/test_tracker.cc
index 6be2a8d..1112e91 100644
--- a/src/tests/audio/test_tracker.cc
+++ b/src/tests/audio/test_tracker.cc
@@ -5,6 +5,7 @@
 #include "audio/gen.h"
 #include "audio/synth.h"
 #include "audio/tracker.h"
+#include "../common/audio_test_fixture.h"
 // #include "generated/music_data.h" // Will be generated by tracker_compiler
 #include <assert.h>
 #include <stdio.h>
@@ -17,15 +18,12 @@ extern const uint32_t g_tracker_patterns_count;
 extern const TrackerScore g_tracker_score;
 
 void test_tracker_init() {
-  AudioEngine engine;
-  engine.init();
+  AudioTestFixture fixture;
   printf("Tracker init test PASSED\n");
-  engine.shutdown();
 }
 
 void test_tracker_pattern_triggering() {
-  AudioEngine engine;
-  engine.init();
+  AudioTestFixture fixture;
 
   // At time 0.0f, 3 patterns are triggered:
   // - crash (1 event at beat 0.0)
@@ -37,31 +35,30 @@ void test_tracker_pattern_triggering() {
   // drums_basic:
   //   0.00, ASSET_KICK_1
   //   0.00, NOTE_A4
-  engine.update(0.0f, 0.0f);
+  fixture.engine().update(0.0f, 0.0f);
   // Expect 2 voices: kick + note
-  assert(engine.get_active_voice_count() == 2);
+  assert(fixture.engine().get_active_voice_count() == 2);
 
   // Test 2: At music_time = 0.25f (beat 0.5 @ 120 BPM), snare event triggers
   //   0.25, ASSET_SNARE_1
-  engine.update(0.25f, 0.0f);
+  fixture.engine().update(0.25f, 0.0f);
   // Expect at least 2 voices (snare + maybe others)
   // Exact count depends on sample duration (kick/note might have finished)
-  int voices = engine.get_active_voice_count();
+  int voices = fixture.engine().get_active_voice_count();
   assert(voices >= 2);
 
   // Test 3: At music_time = 0.5f (beat 1.0), kick event triggers
   //   0.50, ASSET_KICK_1
-  engine.update(0.5f, 0.0f);
+  fixture.engine().update(0.5f, 0.0f);
   // Expect at least 3 voices (new kick + others)
-  assert(engine.get_active_voice_count() >= 3);
+  assert(fixture.engine().get_active_voice_count() >= 3);
 
   // Test 4: Advance to 2.0f - new patterns trigger at time 2.0f
-  engine.update(2.0f, 0.0f);
+  fixture.engine().update(2.0f, 0.0f);
   // Many events have triggered by now
-  assert(engine.get_active_voice_count() > 5);
+  assert(fixture.engine().get_active_voice_count() > 5);
 
   printf("Tracker pattern triggering test PASSED\n");
-  engine.shutdown();
 }
 
 int main() {