[TRTLLM-8580][test] save runtime report periodically (#8312) (#8455)

Signed-off-by: Ivy Zhang <25222398+crazydemo@users.noreply.github.com>

Author: crazydemo

tests/integration/defs/conftest.py

@@ -2313,6 +2313,40 @@ def deselect_by_test_model_suites(test_model_suites, items, test_prefix,
         config.hook.pytest_deselected(items=deselected)
     items[:] = selected
 
+    # Initialize PeriodicJUnitXML reporter if enabled
+    periodic = config.getoption("--periodic-junit", default=False)
+    output_dir = config.getoption("--output-dir", default=None)
+
+    if periodic and output_dir:
+        periodic_interval = config.getoption("--periodic-interval")
+        periodic_batch_size = config.getoption("--periodic-batch-size")
+
+        # Create the reporter with logger
+        xmlpath = os.path.join(output_dir, "results.xml")
+        reporter = PeriodicJUnitXML(
+            xmlpath=xmlpath,
+            interval=periodic_interval,
+            batch_size=periodic_batch_size,
+            logger={
+                'info': print_info,
+                'warning': print_warning
+            },
+        )
+
+        # Configure and register the reporter
+        reporter.pytest_configure(config)
+        config.pluginmanager.register(reporter, 'periodic_junit')
+
+        print_info("PeriodicJUnitXML reporter registered")
+        print_info(
+            f"  Interval: {periodic_interval}s ({periodic_interval/60:.1f} min)"
+        )
+        print_info(f"  Batch size: {periodic_batch_size} tests")
+    elif periodic and not output_dir:
+        print_warning(
+            "Warning: --periodic-junit requires --output-dir to be set. "
+            "Periodic reporting disabled.")
+
 
 def deselect_by_test_model_suites(test_model_suites, items, test_prefix,
                                   config):