Phase 11

tests/test_fps_counter.py

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+import pytest
+
+from src.fps_counter import FPSCounter
+
+
+def test_initial_and_tick_and_average(monkeypatch: pytest.MonkeyPatch) -> None:
+    times = iter([1.0, 1.5, 1.75])
+    monkeypatch.setattr("src.fps_counter.time.perf_counter", lambda: next(times))
+    counter = FPSCounter(2)
+    assert counter.current_fps == counter.average_fps == 0.0
+    assert counter.tick() == 0.0
+    assert counter.tick() == pytest.approx(2.0)
+    assert counter.tick() == pytest.approx(4.0)
+    assert counter.average_fps == pytest.approx(3.0)
+
+
+def test_reset(monkeypatch: pytest.MonkeyPatch) -> None:
+    times = iter([1.0, 2.0])
+    monkeypatch.setattr("src.fps_counter.time.perf_counter", lambda: next(times))
+    counter = FPSCounter(3)
+    counter.tick()
+    counter.tick()
+    counter.reset()
+    assert counter.current_fps == counter.average_fps == 0.0
+    assert counter.sample_count == 0
+
+
+def test_invalid_window() -> None:
+    with pytest.raises(ValueError):
+        FPSCounter(0)