MockPromptForString + doctor to work with ValidatePathError.

packages/cli/src/lib/cmds/doctor.ts

@@ -21,10 +21,10 @@ import {enUS as messages} from '../strings';
 async function jdkDoctor(config: Config, log: Log): Promise<boolean> {
   const result = await JdkHelper.validatePath(config.jdkPath);
   if (result.isError()) {
-    if (result.unwrapError().message === 'jdkPathIsNotCorrect') {
+    if (result.unwrapError().getErrorCode() === 'PathIsNotCorrect') {
       log.error(messages.jdkPathIsNotCorrect);
       return false;
-    } else if (result.unwrapError().message === 'jdkIsNotSupported') {
+    } else if (result.unwrapError().getErrorCode() === 'PathIsNotSupported') {
       log.error(messages.jdkIsNotSupported);
       return false;
     } else { // Error while reading the file, will print the error message.

packages/cli/src/spec/mock/MockPromptForStrings.ts

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ *
+ *  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 {Prompt} from '../../lib/Prompt';
+
+/**
+ * A class which usef for testing and which mocks user's input.
+ */
+export class MockPromptForStrings implements Prompt {
+  async printMessage(): Promise<void> {
+    // An empty function for testing.
+  }
+
+  /**
+   * Sets the output to be the given message.
+   * @param message the message to be returned.
+   */
+  async promptInput<T>(message: string): Promise<T> {
+    return message as unknown as T;
+  }
+
+  /**
+   * Sets the output to be the given message.
+   * @param message the message to be returned.
+   */
+
+  async promptChoice<T>(message: string): Promise<T> {
+    return message as unknown as T;
+  }
+
+  /**
+   * Sets the output to be the given message.
+   * @param defaultValue the value to be returned
+   */
+  async promptConfirm(message: string, defaultValue: boolean): Promise<boolean> {
+    return defaultValue;
+  }
+
+  /**
+   * Sets the output to be the givven message.
+   * @param message the message to be returned.
+   */
+
+  async promptPassword<T>(message: string): Promise<T> {
+    return message as unknown as T;
+  }
+}