Implement initial structure and core functionality for Duck Preview application

tests/test_collector.py

@@ -0,0 +1,22 @@
+import time
+from unittest.mock import MagicMock
+
+from duck_preview.telemetry.collector import TelemetryCollector
+
+
+def test_metrics_empty():
+    collector = TelemetryCollector()
+    metrics = collector.metrics()
+    assert metrics == {"fps": 0, "frame_time_ms": 0.0, "frame_count": 0}
+
+
+def test_metrics_after_frames():
+    collector = TelemetryCollector()
+    mock = MagicMock()
+    for _ in range(30):
+        collector.on_frame(mock)
+        time.sleep(0.002)
+
+    metrics = collector.metrics()
+    assert metrics["frame_count"] >= 30
+    assert metrics["frame_time_ms"] > 0