Add random spinner

index.d.ts

@@ -1,5 +1,6 @@
 declare namespace cliSpinners {
 	type SpinnerName =
+		| 'random'
 		| 'dots'
 		| 'dots2'
 		| 'dots3'

index.js

@@ -2,6 +2,16 @@
 
 const spinners = Object.assign({}, require('./spinners.json'));
 
+const spinnersList = Object.keys(spinners);
+
+Object.defineProperty(spinners, 'random', {
+	get() {
+		const randomIndex = Math.floor(Math.random() * spinnersList.length);
+		const spinnerName = spinnersList[randomIndex];
+		return spinners[spinnerName];
+	}
+});
+
 module.exports = spinners;
 // TODO: Remove this for the next major release
 module.exports.default = spinners;

test.js

@@ -1,8 +1,41 @@
 import test from 'ava';
 import cliSpinners from '.';
 
+function mockMathRandom(fixedResult) {
+	unMockMathRandom();
+	const originalImpl = Math.random;
+	Math.random = () => fixedResult;
+	Math.random.originalImpl = originalImpl;
+}
+
+function unMockMathRandom() {
+	if (Math.random.originalImpl) {
+		Math.random = Math.random.originalImpl;
+	}
+}
+
 test('main', t => {
 	t.is(typeof cliSpinners, 'object');
 	t.is(cliSpinners.dots.interval, 80);
 	t.true(Array.isArray(cliSpinners.dots.frames));
 });
+
+test('random getter', t => {
+	const spinnersList = Object.keys(cliSpinners)
+		// TODO: remove this filter when "module.exports.default = spinners" is removed from index.js;
+		.filter(key => key !== 'default')
+		.map(key => cliSpinners[key]);
+
+	// Should always return an item from the spinners list
+	t.true(spinnersList.includes(cliSpinners.random));
+
+	// Should return the first spinner when math.random is the min value
+	mockMathRandom(0);
+	t.is(cliSpinners.random, spinnersList[0]);
+
+	mockMathRandom(0.99);
+	// Should return the last spinner when math.random is the max value
+	t.is(cliSpinners.random, spinnersList[spinnersList.length - 1]);
+
+	unMockMathRandom();
+});