Fixed bug in peak memory stats + added unit test

tests/test_foundation_stats.py

@@ -0,0 +1,27 @@
+import pathlib
+import unittest
+
+from benchmark.foundation import stats
+
+
+class StatsTest(unittest.TestCase):
+    def test_real_logs(self):
+        fake_log = pathlib.Path(__file__).with_name('classroom.log')
+        stat = stats.Stats()
+        with fake_log.open('r') as logfile:
+            for line in logfile:
+                stat.update(line)
+
+        self.assertEqual(25.91, stat.device_memory_usage)
+        self.assertEqual(49.71, stat.device_peak_memory)
+
+        # Rendering is done
+        self.assertIsNone(stat.current_sample)
+        self.assertIsNone(stat.total_samples)
+
+        self.assertEqual(144, stat.current_tiles)
+        self.assertEqual('Path Tracing Tile', stat.path_tracing)
+        self.assertEqual(0.21, stat.pipeline_render_time)
+        self.assertEqual(0.031718, stat.render_time_no_sync)
+        self.assertEqual(0.182569, stat.total_render_time)
+        self.assertEqual(144, stat.total_tiles)