test: add resend plugin coverage

plugins/resend/index.test.ts

@@ -0,0 +1,90 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+import { ResendPlugin } from './index'
+
+let resendPlugin: ResendPlugin
+
+beforeEach(() => {
+    vi.clearAllMocks()
+    resendPlugin = new ResendPlugin({ apiKey: 'test-api-key' })
+    vi.stubGlobal('fetch', vi.fn())
+})
+
+afterEach(() => {
+    vi.unstubAllGlobals()
+})
+
+describe('ResendPlugin - Initialization', () => {
+    it('should initialize with the configured API key', () => {
+        expect(resendPlugin).toBeInstanceOf(ResendPlugin)
+        expect(resendPlugin.apiKey).toBe('test-api-key')
+    })
+
+    it('should allow initialization without options', () => {
+        const plugin = new ResendPlugin()
+
+        expect(plugin.apiKey).toBeUndefined()
+    })
+})
+
+describe('ResendPlugin - sendEmail()', () => {
+    it('should send email requests to the Resend API', async () => {
+        const responsePayload = { id: 'email_123' }
+        vi.mocked(fetch).mockResolvedValueOnce(
+            new Response(JSON.stringify(responsePayload), { status: 200 })
+        )
+
+        const result = await resendPlugin.sendEmail(
+            'hello@example.com',
+            ['customer@example.com'],
+            'Welcome',
+            '<p>Hello</p>'
+        )
+
+        expect(fetch).toHaveBeenCalledWith('https://api.resend.com/emails', {
+            method: 'POST',
+            headers: {
+                Authorization: 'Bearer test-api-key',
+                'Content-Type': 'application/json',
+            },
+            body: JSON.stringify({
+                from: 'hello@example.com',
+                to: ['customer@example.com'],
+                subject: 'Welcome',
+                html: '<p>Hello</p>',
+            }),
+        })
+        expect(result).toEqual(responsePayload)
+    })
+
+    it('should throw the Resend error message when the request fails', async () => {
+        vi.mocked(fetch).mockResolvedValueOnce(
+            new Response(JSON.stringify({ message: 'Invalid API key' }), {
+                status: 401,
+            })
+        )
+
+        await expect(
+            resendPlugin.sendEmail(
+                'hello@example.com',
+                ['customer@example.com'],
+                'Welcome',
+                '<p>Hello</p>'
+            )
+        ).rejects.toThrow('Invalid API key')
+    })
+
+    it('should throw a fallback message when Resend omits an error message', async () => {
+        vi.mocked(fetch).mockResolvedValueOnce(
+            new Response(JSON.stringify({}), { status: 500 })
+        )
+
+        await expect(
+            resendPlugin.sendEmail(
+                'hello@example.com',
+                ['customer@example.com'],
+                'Welcome',
+                '<p>Hello</p>'
+            )
+        ).rejects.toThrow('Failed to send email')
+    })
+})