test: add tests for usePromise

Author: favorodera

tests/index.test.ts

@@ -0,0 +1,89 @@
+import { describe, it, expect, vi } from 'vitest'
+import { usePromise } from '../src'
+
+function delay(ms: number) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
+
+describe('usePromise', () => {
+  it('resolves successfully', async () => {
+    const { state, execute } = usePromise(async () => 'hello')
+
+    await execute()
+
+    expect(state.value.status).toBe('success')
+    expect(state.value.data).toBe('hello')
+  })
+
+  it('handles errors', async () => {
+    const { state, execute } = usePromise(async () => {
+      throw new Error('fail')
+    })
+
+    await execute()
+
+    expect(state.value.status).toBe('error')
+    expect(state.value.error?.message).toBe('fail')
+  })
+
+  it('preserves data during reload', async () => {
+    let count = 0
+
+    const { state, execute } = usePromise(async () => {
+      count++
+      await delay(10)
+      return count
+    })
+
+    await execute()
+    const first = state.value.data
+
+    execute() // don't await
+
+    expect(state.value.data).toBe(first)
+  })
+
+  it('aborts previous request', async () => {
+    const spy = vi.fn()
+
+    const { execute } = usePromise(async (signal) => {
+      await delay(20)
+      if (!signal.aborted) spy()
+    })
+
+    execute()
+    execute()
+
+    await delay(50)
+
+    expect(spy).toHaveBeenCalledTimes(1)
+  })
+
+  it('prevents race conditions', async () => {
+    const { state, execute } = usePromise(
+      async (_, value: number) => {
+        await delay(value === 1 ? 30 : 10)
+        return value
+      },
+    )
+
+    execute(1)
+    await execute(2)
+
+    expect(state.value.data).toBe(2)
+  })
+
+  it('abort prevents state update', async () => {
+    const { state, execute, abort } = usePromise(async () => {
+      await delay(20)
+      return 'done'
+    })
+
+    execute()
+    abort()
+
+    await delay(30)
+
+    expect(state.value.status).not.toBe('success')
+  })
+})