Added basic tests using mocha and chai

.eslintrc.js

@@ -7,9 +7,11 @@ module.exports = {
     ecmaVersion: 2017,
     sourceType: "module"
   },
-  extends: ["eslint:recommended", "plugin:node/recommended"],
+  extends: [
+    "eslint:recommended", 
+    "plugin:node/recommended"
+  ],
   rules: {
-    // overwritten Eslint rule recommeded rule
     "space-unary-ops": [
       "error",
       {
@@ -37,5 +39,24 @@ module.exports = {
     "func-call-spacing": ["error", "never"],
     "space-before-function-paren": ["error", "never"],
     semi: "error"
-  }
+  },
+  overrides: [
+    // test files
+    {
+      files: ['tests/**/*.js'],
+      parserOptions: {
+        sourceType: 'script',
+        ecmaVersion: 2017
+      },
+      env: {
+        mocha: true
+      },
+      plugins: [
+        "mocha"
+      ],
+      rules: {
+        "mocha/no-exclusive-tests": "error"
+      }
+    }
+  ]
 };

package.json

@@ -8,9 +8,9 @@
     "lint-prepush": "index.js"
   },
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
     "lint": "node_modules/.bin/eslint **/*.js",
     "format": "yarn lint --fix",
+    "test": "mocha tests/",
     "prepush": "node index.js"
   },
   "lint-prepush": {
@@ -21,13 +21,16 @@
     }
   },
   "devDependencies": {
-    "eslint": "^5.14.1",
+    "chai": "^4.2.0",
+    "eslint": "^5.16.0",
+    "eslint-plugin-mocha": "^5.3.0",
     "eslint-plugin-node": "^8.0.1",
-    "husky": "^0.14.3"
+    "husky": "^0.14.3",
+    "mocha": "^6.1.4"
   },
   "dependencies": {
     "chalk": "^2.4.1",
-    "cosmiconfig": "^5.0.5",
+    "cosmiconfig": "^5.2.1",
     "debug": "^3.1.0",
     "dedent": "^0.7.0",
     "execa": "^0.10.0",
@@ -38,7 +41,7 @@
     "npm-which": "^3.0.1"
   },
   "engines": {
-    "node": ">=6"
+    "node": ">=7.6.0"
   },
   "repository": {
     "type": "git",

tests/index.js

@@ -0,0 +1,13 @@
+const chai = require('chai'); // eslint-disable-line node/no-unpublished-require
+const { expect } = chai;
+const { execChildProcess } = require('../utils/common');
+
+describe('Test commmon util functions', () => {
+  describe('Assert execChildProcess() function', () => {
+    it('should return Hello World', () => {
+      return execChildProcess({ command : "echo 'Hello World!' " }).then( (result = '') => {
+        expect(result).to.equal('Hello World!');
+      });
+    });
+  });
+});