added a few unit test cases for registerAuth

Author: bhparijat

.changeset/small-chairs-explain.md

@@ -1,5 +1,5 @@
 ---
-'@firebase/auth': minor
+'@firebase/auth': patch
 ---
 
 Allow port numbers in authDomain

packages/auth/src/core/auth/register.test.ts

@@ -0,0 +1,50 @@
+/**
+ * @license
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { expect, use } from 'chai';
+import chaiAsPromised from 'chai-as-promised';
+import sinonChai from 'sinon-chai';
+import { FirebaseError } from '@firebase/util';
+import { registerAuth } from './register';
+import { ClientPlatform } from '../util/version';
+use(sinonChai);
+use(chaiAsPromised);
+
+describe('it should register successfully for each platform type', () => {
+  it('should not throw error for node platform', () => {
+    expect(() => {
+      registerAuth(ClientPlatform.NODE);
+    }).to.not.throw(FirebaseError);
+  });
+
+  it('should not throw error for browser platform', () => {
+    expect(() => {
+      registerAuth(ClientPlatform.BROWSER);
+    }).to.not.throw(FirebaseError);
+  });
+
+  it('should not throw error for react native platform', () => {
+    expect(() => {
+      registerAuth(ClientPlatform.REACT_NATIVE);
+    }).to.not.throw(FirebaseError);
+  });
+
+  it('should not throw error for worker platform', () => {
+    expect(() => {
+      registerAuth(ClientPlatform.WORKER);
+    }).to.not.throw(FirebaseError);
+  });
+});