test: increase coverage for ModuleMap

Add test for ModuleMap set with ModuleJob but bad url.

PR-URL: #16045
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Bradley Farias <bradley.meck@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

test/es-module/test-esm-loader-modulemap.js

@@ -0,0 +1,56 @@
+'use strict';
+// Flags: --expose-internals
+
+// This test ensures that the type checking of ModuleMap throws
+// errors appropriately
+
+const common = require('../common');
+
+const { URL } = require('url');
+const Loader = require('internal/loader/Loader');
+const ModuleMap = require('internal/loader/ModuleMap');
+const ModuleJob = require('internal/loader/ModuleJob');
+const { createDynamicModule } = require('internal/loader/ModuleWrap');
+
+const stubModuleUrl = new URL('file://tmp/test');
+const stubModule = createDynamicModule(['default'], stubModuleUrl);
+const loader = new Loader();
+const moduleMap = new ModuleMap();
+const moduleJob = new ModuleJob(loader, stubModule.module,
+                                () => new Promise(() => {}));
+
+common.expectsError(
+  () => moduleMap.get(1),
+  {
+    code: 'ERR_INVALID_ARG_TYPE',
+    type: TypeError,
+    message: 'The "url" argument must be of type string'
+  }
+);
+
+common.expectsError(
+  () => moduleMap.set(1, moduleJob),
+  {
+    code: 'ERR_INVALID_ARG_TYPE',
+    type: TypeError,
+    message: 'The "url" argument must be of type string'
+  }
+);
+
+common.expectsError(
+  () => moduleMap.set('somestring', 'notamodulejob'),
+  {
+    code: 'ERR_INVALID_ARG_TYPE',
+    type: TypeError,
+    message: 'The "job" argument must be of type ModuleJob'
+  }
+);
+
+common.expectsError(
+  () => moduleMap.has(1),
+  {
+    code: 'ERR_INVALID_ARG_TYPE',
+    type: TypeError,
+    message: 'The "url" argument must be of type string'
+  }
+);