Added jest testing.

src/lib/__tests__/format.test.ts

@@ -0,0 +1,38 @@
+import * as format from '../format';
+
+test('parseTime', () => {
+  expect(format.parseTime(86400 + 3600 + 60 + 1)).toEqual({
+    days: 1,
+    hours: 1,
+    minutes: 1,
+    seconds: 1,
+    ms: 0,
+  });
+});
+
+test('formatTime', () => {
+  expect(format.formatTime(3600 + 60 + 1)).toBe('1:01:01');
+});
+
+test('formatShortTime', () => {
+  expect(format.formatShortTime(3600 + 60 + 1)).toBe('1m1s');
+
+  expect(format.formatShortTime(3600 + 60 + 1, ['h', 'm', 's'])).toBe('1h1m1s');
+});
+
+test('formatNumber', () => {
+  expect(format.formatNumber('10.2')).toBe('10');
+  expect(format.formatNumber('10.5')).toBe('11');
+});
+
+test('formatLongNumber', () => {
+  expect(format.formatLongNumber(1200000)).toBe('1.2m');
+  expect(format.formatLongNumber(575000)).toBe('575k');
+  expect(format.formatLongNumber(10500)).toBe('10.5k');
+  expect(format.formatLongNumber(1200)).toBe('1.20k');
+});
+
+test('stringToColor', () => {
+  expect(format.stringToColor('hello')).toBe('#d218e9');
+  expect(format.stringToColor('goodbye')).toBe('#11e956');
+});