feat: enhance audio and data handling with new test cases

- Added comprehensive unit tests for audio functionalities, including playback control, volume adjustments, and source management.
- Implemented new tests for data handling, focusing on ByteData and DataView functionalities, ensuring proper memory management and error handling.
- Updated CMakeLists to include new test files for improved coverage and organization.
- Enhanced event handling tests to verify message processing and variant functionalities.

test/timer_cpp.cpp

@@ -0,0 +1,32 @@
+#include "zeroerr/assert.h"
+#include "zeroerr/unittest.h"
+
+#include "timer/Timer.h"
+
+#include <chrono>
+#include <thread>
+
+TEST_CASE("timer.getTime.monotonic") {
+    auto* t = eve::timer::Timer::create();
+    float t0 = t->getTime();
+    float t1 = t->getTime();
+    CHECK(t1 >= t0);
+}
+
+TEST_CASE("timer.step.deltaNonNegative") {
+    auto* t = eve::timer::Timer::create();
+    t->step();
+    CHECK(t->getDelta() >= 0.f);
+    float d = t->step();
+    CHECK(d >= 0.f);
+    CHECK(t->getDelta() == d);
+}
+
+TEST_CASE("timer.step.deltaPositiveAfterSleep") {
+    auto* t = eve::timer::Timer::create();
+    t->step();
+    std::this_thread::sleep_for(std::chrono::milliseconds(15));
+    float delta = t->step();
+    CHECK(delta > 0.f);
+    CHECK(t->getDelta() == delta);
+}