test: exit the test script with failure if tests failed

Author: nos1dot618

tests/tests.py

@@ -43,3 +43,5 @@ def execCommand(command):
             logger.error(f"Test failed '{testName}' due to output mismatch.")
             failCount += 1
     logger.info(f"Passed: {passCount}. Failed: {failCount}. Total: {totalCount}.")
+    if failCount > 0:
+        exit(1)