specs.

Author: odeadglaz

configuration/webpack.config.js

@@ -1,10 +1,10 @@
 const path = require('path');
-const { isProduction, PRODUCTION} = require('../src/lib');
+const { env, isProduction } = require('../src/lib');
 
 const root = path.resolve(__dirname, '..');
 
 module.exports = {
-    mode: process.env.NODE_ENV || PRODUCTION,
+    mode: env,
     devtool: 'source-map',
     entry: path.join(root, 'index.js'),
     target: 'node',

src/lib/index.js

@@ -4,8 +4,10 @@
  */
 const PRODUCTION = 'production';
 
+const env = process.env.NODE_ENV || PRODUCTION;
+
 module.exports = {
-    PRODUCTION,
-    isProduction: () => process.env.NODE_ENV || PRODUCTION,
+    env,
+    isProduction: (environment = env) => environment === PRODUCTION,
     isUndefined: (thing) => [null, undefined].includes(thing)
 };

src/lib/spec.js

@@ -0,0 +1,35 @@
+const lib = require ('.');
+
+describe('Lib', () => {
+    describe('isProduction', () => {
+
+        it.each([
+            'something',
+            'dev'
+        ])('Returns falsy when env - (%p) is not production', (env) => {
+            expect(lib.isProduction(env)).toBeFalsy();
+        });
+
+        it('Returns truthy when running on production', () => {
+            expect(lib.isProduction('production')).toBeTruthy();
+        });
+    });
+
+    describe('isUndefined', () => {
+        it.each([
+            'String',
+            false,
+            {},
+            1
+        ])('Returns falsy when given value is defined', (val) => {
+            expect(lib.isUndefined(val)).toBeFalsy();
+        });
+
+        it.each([
+            undefined,
+            null
+        ])('Returns truthy when value is undefined', (val) => {
+            expect(lib.isUndefined(val)).toBeTruthy();
+        });
+    });
+});