--- /dev/null
+import { resolveAfter } from './resolve_after';
+
+describe('Resolve After', () => {
+
+ test('it should throw if given 0', () => {
+
+ expect(() => {
+
+ resolveAfter(0);
+ }).toThrow();
+ });
+
+ test('it should throw if given a negative number', () => {
+
+ expect(() => {
+
+ resolveAfter(-1);
+ }).toThrow();
+ });
+
+ test('it should resolve after the specified number of times', () => {
+
+ expect(() => {
+
+ const { counter, promise: resolveAfterThree } = resolveAfter(3);
+ let resolved = false;
+
+ resolveAfterThree.then(() => (resolved = true));
+ counter();
+ expect(resolved).toBe(false);
+ counter();
+ expect(resolved).toBe(false);
+ counter();
+ expect(resolved).toBe(true);
+ }).toThrow();
+ });
+});