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test/utils/delayedResolve.test.ts

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+import { describe, it, expect, beforeEach, afterEach } from '@jest/globals';
+import delayedResolve from "../../src/utils/delayedResolve.ts";
+
+describe('delayedResolve', () => {
+  beforeEach(() => {
+    jest.useFakeTimers();
+  });
+
+  afterEach(() => {
+    jest.useRealTimers();
+  });
+
+  it('returns the resolved value of the promise', async () => {
+    const resultPromise = delayedResolve(Promise.resolve('hello'), 100);
+    await jest.advanceTimersByTimeAsync(100);
+    expect(await resultPromise).toBe('hello');
+  });
+
+  it('waits at least minDelayMs before resolving', async () => {
+    let resolved = false;
+    const resultPromise = delayedResolve(Promise.resolve('fast'), 100);
+    resultPromise.then(() => { resolved = true; });
+
+    await jest.advanceTimersByTimeAsync(50);
+    expect(resolved).toBe(false);
+
+    await jest.advanceTimersByTimeAsync(50);
+    expect(resolved).toBe(true);
+  });
+
+  it('resolves immediately after slow promise if it exceeds minDelayMs', async () => {
+    let resolved = false;
+    const slowPromise = new Promise<string>(resolve =>
+      setTimeout(() => resolve('slow'), 150)
+    );
+    const resultPromise = delayedResolve(slowPromise, 50);
+    resultPromise.then(() => { resolved = true; });
+
+    await jest.advanceTimersByTimeAsync(50);
+    expect(resolved).toBe(false);
+
+    await jest.advanceTimersByTimeAsync(100);
+    expect(resolved).toBe(true);
+    expect(await resultPromise).toBe('slow');
+  });
+
+  it('propagates rejections from the promise', async () => {
+    const error = new Error('test error');
+    const rejectedPromise = Promise.reject(error);
+
+    const resultPromise = delayedResolve(rejectedPromise, 100);
+    const assertion = expect(resultPromise).rejects.toThrow('test error');
+
+    await jest.advanceTimersByTimeAsync(100);
+
+    await assertion;
+  });
+
+  it('works with different value types', async () => {
+    const test = async <T>(value: T) => {
+      const resultPromise = delayedResolve(Promise.resolve(value), 10);
+      await jest.advanceTimersByTimeAsync(10);
+      return resultPromise;
+    };
+
+    expect(await test(42)).toBe(42);
+    expect(await test({ foo: 'bar' })).toEqual({ foo: 'bar' });
+    expect(await test([1, 2, 3])).toEqual([1, 2, 3]);
+    expect(await test(null)).toBeNull();
+  });
+
+  it('handles zero delay', async () => {
+    const resultPromise = delayedResolve(Promise.resolve('instant'), 0);
+    await jest.advanceTimersByTimeAsync(0);
+    expect(await resultPromise).toBe('instant');
+  });
+});