tests: Fail if RPC has been added without tests

test/functional/test_runner.py

@@ -401,16 +401,18 @@ def run_tests(*, test_list, src_dir, build_dir, tmpdir, jobs=1, enable_coverage=
     print_results(test_results, max_len_name, (int(time.time() - start_time)))
 
     if coverage:
-        coverage.report_rpc_coverage()
+        coverage_passed = coverage.report_rpc_coverage()
 
         logging.debug("Cleaning up coverage data")
         coverage.cleanup()
+    else:
+        coverage_passed = True
 
     # Clear up the temp directory if all subdirectories are gone
     if not os.listdir(tmpdir):
         os.rmdir(tmpdir)
 
-    all_passed = all(map(lambda test_result: test_result.was_successful, test_results))
+    all_passed = all(map(lambda test_result: test_result.was_successful, test_results)) and coverage_passed
 
     # This will be a no-op unless failfast is True in which case there may be dangling
     # processes which need to be killed.
@@ -612,8 +614,10 @@ class RPCCoverage():
         if uncovered:
             print("Uncovered RPC commands:")
             print("".join(("  - %s\n" % command) for command in sorted(uncovered)))
+            return False
         else:
             print("All RPC commands covered.")
+            return True
 
     def cleanup(self):
         return shutil.rmtree(self.dir)