test: cover resend plugin

plugins/resend/index.test.ts

@@ -0,0 +1,113 @@
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { ResendPlugin } from './index'
+
+const mockFetch = (response: { ok: boolean; json: () => Promise<unknown> }) => {
+    const fetchMock = vi.fn().mockResolvedValue(response)
+    vi.stubGlobal('fetch', fetchMock)
+    return fetchMock
+}
+
+describe('ResendPlugin', () => {
+    afterEach(() => {
+        vi.unstubAllGlobals()
+    })
+
+    it('stores the configured API key', () => {
+        const plugin = new ResendPlugin({ apiKey: 're_test' })
+
+        expect(plugin.apiKey).toBe('re_test')
+    })
+
+    it('sends email requests to Resend with authorization and JSON body', async () => {
+        const responseBody = { id: 'email_123' }
+        const fetchMock = mockFetch({
+            ok: true,
+            json: async () => responseBody,
+        })
+        const plugin = new ResendPlugin({ apiKey: 're_test' })
+
+        await expect(
+            plugin.sendEmail(
+                'sender@example.com',
+                ['ada@example.com', 'grace@example.com'],
+                'Welcome',
+                '<strong>Hello</strong>'
+            )
+        ).resolves.toBe(responseBody)
+
+        expect(fetchMock).toHaveBeenCalledWith(
+            'https://api.resend.com/emails',
+            {
+                method: 'POST',
+                headers: {
+                    Authorization: 'Bearer re_test',
+                    'Content-Type': 'application/json',
+                },
+                body: JSON.stringify({
+                    from: 'sender@example.com',
+                    to: ['ada@example.com', 'grace@example.com'],
+                    subject: 'Welcome',
+                    html: '<strong>Hello</strong>',
+                }),
+            }
+        )
+    })
+
+    it('throws the provider message when Resend rejects the request', async () => {
+        mockFetch({
+            ok: false,
+            json: async () => ({ message: 'Invalid API key' }),
+        })
+        const plugin = new ResendPlugin({ apiKey: 'bad_key' })
+
+        await expect(
+            plugin.sendEmail(
+                'sender@example.com',
+                ['ada@example.com'],
+                'Welcome',
+                '<strong>Hello</strong>'
+            )
+        ).rejects.toThrow('Invalid API key')
+    })
+
+    it('throws a fallback error when Resend does not provide a message', async () => {
+        mockFetch({
+            ok: false,
+            json: async () => ({ error: 'unknown' }),
+        })
+        const plugin = new ResendPlugin({ apiKey: 're_test' })
+
+        await expect(
+            plugin.sendEmail(
+                'sender@example.com',
+                ['ada@example.com'],
+                'Welcome',
+                '<strong>Hello</strong>'
+            )
+        ).rejects.toThrow('Failed to send email')
+    })
+
+    it('uses an undefined API key consistently when none is configured', async () => {
+        const fetchMock = mockFetch({
+            ok: true,
+            json: async () => ({ id: 'email_123' }),
+        })
+        const plugin = new ResendPlugin()
+
+        await plugin.sendEmail(
+            'sender@example.com',
+            ['ada@example.com'],
+            'Welcome',
+            '<strong>Hello</strong>'
+        )
+
+        expect(fetchMock).toHaveBeenCalledWith(
+            'https://api.resend.com/emails',
+            expect.objectContaining({
+                headers: expect.objectContaining({
+                    Authorization: 'Bearer undefined',
+                }),
+            })
+        )
+    })
+})