add typeDelay option

Author: saurabhdaware

cli-examples/__tests__/multiple-prompts.test.js

@@ -0,0 +1,17 @@
+const path = require('path');
+const { createCommandInterface } = require('../../lib');
+
+const wait = ms => new Promise(resolve => setTimeout(resolve, ms));
+
+test('should pass', async () => {
+  const commandInterface = createCommandInterface('node ./multiple-prompts.js', {
+    cwd: path.join(__dirname, '..'),
+    logData: true,
+  });
+  await commandInterface.type('19\n');
+  // await wait(100);
+  await commandInterface.type('saurabh\n');
+  const terminal = await commandInterface.getOutput();
+  console.log(terminal);
+  expect(1).toBe(1);
+});

lib/cli-testing-library.js

@@ -8,6 +8,13 @@ const { spawn } = require('child_process');
  *  tokenizedOutput: string, 
  *  rawOutput: string
  * })} ParsedOutput 
+ * 
+ * @typedef {({
+ *  typeDelay: number,
+ *  logData: boolean,
+ *  cwd: string,
+ *  env: any
+ * })} Options
  */
 
 // Big shoutout to https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797 for super cool reference to all ansi codes
@@ -38,6 +45,8 @@ const ANSI_CHARACTER_MAPS = {
   BOLD_2_END: `${ESC}23m`,
 }
 
+const wait = ms => new Promise(resolve => setTimeout(resolve, ms));
+
 const parseOutput = (output) => {
   const textAfter = (question) => {
     const questionIndex = output.indexOf(question) + question.length;
@@ -70,6 +79,11 @@ const parseOutput = (output) => {
   };
 };
 
+/**
+ * 
+ * @param {string} commandString 
+ * @param {Options} options 
+ */
 const createCommandInterface = (commandString, options) => {
   // /** @type {import('child_process').ChildProcessWithoutNullStreams} */
   // let command;
@@ -102,11 +116,13 @@ const createCommandInterface = (commandString, options) => {
     throw error;
   });
 
-  const type = (text) => {
+  const type = async (text) => {
     if (isFinishTypingCalled) {
       throw new Error('[cli-testing-library]: `type` cannot be called after `getOutput` or `finishTyping`');
     };
 
+    await wait(options.typeDelay ? options.typeDelay : 100);
+
     return new Promise((resolve) => {
       command.stdin.write(`${text}`, () => {
         resolve();