Test: Make 'make test' exit non-zero if tests failed

test/problems

@@ -129,5 +129,4 @@ if __name__ == "__main__":
         print_category(expected)
 
     # If we encoutered any failures, return non-zero code
-    if sum(errors.values()):
-        sys.exit(1)
+    sys.exit(1 if error_int or unexpected_int else 0)

test/run_all

@@ -198,11 +198,8 @@ def main():
     runner = TestRunner()
     runner.start()
 
-    # If we're producing summary report, propagate the return code
-    if not cmd_args.verbose:
-        return runner.show_report()
-    else:
-        return 0
+    # Propagate the return code
+    return runner.show_report()
 
 
 if __name__ == "__main__":