src: add test flag to config file

Author: marco-ippolito

doc/node-config-schema.json

@@ -665,6 +665,9 @@
         "experimental-test-module-mocks": {
           "type": "boolean"
         },
+        "test": {
+          "type": "boolean"
+        },
         "test-concurrency": {
           "type": "number"
         },

src/node_options.cc

@@ -839,7 +839,9 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
   AddOption("--test",
             "launch test runner on startup",
             &EnvironmentOptions::test_runner,
-            kDisallowedInEnvvar);
+            kDisallowedInEnvvar,
+            false,
+            OptionNamespaces::kTestRunnerNamespace);
   AddOption("--test-concurrency",
             "specify test runner concurrency",
             &EnvironmentOptions::test_runner_concurrency,