Added few tests for lib/chalk.js

Author: Stanisław Jaros

test/chalk.js

@@ -0,0 +1,14 @@
+'use strict';
+const {test} = require('tap');
+const chalk = require('../lib/chalk');
+
+test('throws an error when trying to access chalk config and chalk config is not configured', t => {
+	t.throws(chalk.get, 'Chalk has not yet been configured');
+	t.end();
+});
+
+test('throws an error when trying to set chalk config and chalk config is configured', t => {
+	chalk.set({});
+	t.throws(chalk.set, 'Chalk has already been configured');
+	t.end();
+});