diff --git a/plugins/cron/index.test.ts b/plugins/cron/index.test.ts
new file mode 100644
index 0000000..a9ab427
--- /dev/null
+++ b/plugins/cron/index.test.ts
@@ -0,0 +1,188 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { CronPlugin, CronEventPayload } from './index'
+import { StarbaseApp } from '../../src/handler'
+import { DataSource } from '../../src/types'
+
+let cronPlugin: CronPlugin
+let mockDataSource: DataSource
+let mockExecutionContext: ExecutionContext
+
+beforeEach(() => {
+    vi.clearAllMocks()
+
+    mockExecutionContext = {
+        waitUntil: vi.fn(),
+    } as unknown as ExecutionContext
+
+    mockDataSource = {
+        rpc: {
+            executeQuery: vi.fn().mockResolvedValue([]),
+            setAlarm: vi.fn().mockResolvedValue(true),
+        },
+    } as unknown as DataSource
+
+    cronPlugin = new CronPlugin()
+})
+
+describe('CronPlugin - Initialization', () => {
+    it('should initialize with correct name and auth requirements', () => {
+        expect(cronPlugin).toBeInstanceOf(CronPlugin)
+        expect(cronPlugin.name).toBe('starbasedb:cron')
+        expect(cronPlugin.pathPrefix).toBe('/cron')
+        expect(cronPlugin.opts.requiresAuth).toBe(true)
+    })
+})
+
+describe('CronPlugin - register() and Middleware', () => {
+    it('should set up middleware that initializes table and schedules alarms', async () => {
+        let middlewareHandler: any = null
+        const mockApp = {
+            use: vi.fn((fn) => {
+                middlewareHandler = fn
+            }),
+            post: vi.fn(),
+        } as unknown as StarbaseApp
+
+        await cronPlugin.register(mockApp)
+
+        expect(mockApp.use).toHaveBeenCalledTimes(1)
+        expect(mockApp.post).toHaveBeenCalledWith(
+            '/cron/callback',
+            expect.any(Function)
+        )
+
+        const mockContext = {
+            get: vi.fn(() => mockDataSource),
+        }
+        const mockNext = vi.fn().mockResolvedValue(undefined)
+
+        await middlewareHandler(mockContext, mockNext)
+
+        expect(mockDataSource.rpc.executeQuery).toHaveBeenCalledWith({
+            sql: expect.stringContaining(
+                'CREATE TABLE IF NOT EXISTS tmp_cron_tasks'
+            ),
+            params: [],
+        })
+        expect(mockNext).toHaveBeenCalledTimes(1)
+    })
+
+    it('should handle POST /cron/callback and invoke registered callbacks', async () => {
+        let postHandler: any = null
+        const mockApp = {
+            use: vi.fn(),
+            post: vi.fn((path, handler) => {
+                if (path === '/cron/callback') {
+                    postHandler = handler
+                }
+            }),
+        } as unknown as StarbaseApp
+
+        await cronPlugin.register(mockApp)
+
+        const sampleEvent: CronEventPayload = {
+            name: 'cleanup_job',
+            cron_tab: '0 * * * *',
+            payload: { dryRun: false },
+        }
+
+        const receivedPayloads: CronEventPayload[] = []
+        cronPlugin.onEvent((evt) => {
+            receivedPayloads.push(evt)
+        })
+
+        const mockReqContext = {
+            req: {
+                json: vi.fn().mockResolvedValue([sampleEvent]),
+            },
+        }
+
+        const response = await postHandler(mockReqContext)
+        expect(response.status).toBe(200)
+        expect(receivedPayloads).toHaveLength(1)
+        expect(receivedPayloads[0].name).toBe('cleanup_job')
+    })
+})
+
+describe('CronPlugin - addEvent()', () => {
+    it('should throw an error when called before dataSource is initialized', async () => {
+        await expect(
+            cronPlugin.addEvent(
+                '* * * * *',
+                'task_1',
+                {},
+                'https://api.example.com'
+            )
+        ).rejects.toThrow('CronPlugin not properly initialized')
+    })
+
+    it('should insert task into database and reschedule next alarm', async () => {
+        // Manually assign dataSource for unit test
+        cronPlugin['dataSource'] = mockDataSource
+
+        // Mock executeQuery for GET_TASKS to return the newly added task
+        ;(mockDataSource.rpc.executeQuery as any).mockImplementation(
+            ({ sql }: any) => {
+                if (sql.includes('SELECT name, cron_tab, payload')) {
+                    return [
+                        {
+                            name: 'sync_data',
+                            cron_tab: '*/10 * * * *',
+                            payload: '{"target":"db"}',
+                        },
+                    ]
+                }
+                return []
+            }
+        )
+
+        await cronPlugin.addEvent(
+            '*/10 * * * *',
+            'sync_data',
+            { target: 'db' },
+            'https://api.example.com'
+        )
+
+        expect(mockDataSource.rpc.executeQuery).toHaveBeenCalledWith({
+            sql: expect.stringContaining(
+                'INSERT OR REPLACE INTO tmp_cron_tasks'
+            ),
+            params: [
+                'sync_data',
+                '*/10 * * * *',
+                JSON.stringify({ target: 'db' }),
+                'https://api.example.com',
+            ],
+        })
+
+        expect(mockDataSource.rpc.setAlarm).toHaveBeenCalledWith(
+            expect.any(Number)
+        )
+    })
+})
+
+describe('CronPlugin - onEvent() with ExecutionContext', () => {
+    it('should route async promise to ctx.waitUntil', async () => {
+        let asyncFinished = false
+        const asyncCallback = async () => {
+            await new Promise((res) => setTimeout(res, 10))
+            asyncFinished = true
+        }
+
+        cronPlugin.onEvent(asyncCallback, mockExecutionContext)
+
+        // Invoke callback wrapper directly
+        const sampleEvent: CronEventPayload = {
+            name: 'test',
+            cron_tab: '* * * * *',
+            payload: {},
+        }
+
+        const registeredCallback = cronPlugin['eventCallbacks'][0]
+        await registeredCallback(sampleEvent)
+
+        expect(mockExecutionContext.waitUntil).toHaveBeenCalledWith(
+            expect.any(Promise)
+        )
+    })
+})
diff --git a/plugins/cron/utils.test.ts b/plugins/cron/utils.test.ts
new file mode 100644
index 0000000..de615c8
--- /dev/null
+++ b/plugins/cron/utils.test.ts
@@ -0,0 +1,48 @@
+import { describe, it, expect } from 'vitest'
+import { parseCronExpression, getNextExecutionTime } from './utils'
+
+describe('Cron Utils - parseCronExpression()', () => {
+    it('should successfully parse valid standard 5-part cron expressions', () => {
+        const interval = parseCronExpression('*/5 * * * *')
+        expect(interval).toBeDefined()
+        expect(typeof interval.next).toBe('function')
+    })
+
+    it('should parse hourly cron expressions', () => {
+        const interval = parseCronExpression('0 * * * *')
+        expect(interval).toBeDefined()
+        const nextDate = interval.next().toDate()
+        expect(nextDate).toBeInstanceOf(Date)
+    })
+
+    it('should throw an error for invalid cron expressions', () => {
+        expect(() => parseCronExpression('invalid cron string')).toThrow()
+        expect(() => parseCronExpression('60 * * * *')).toThrow()
+    })
+})
+
+describe('Cron Utils - getNextExecutionTime()', () => {
+    it('should calculate the next execution time greater than the reference timestamp', () => {
+        const refTime = new Date('2026-01-01T12:00:00Z').getTime()
+        const nextTime = getNextExecutionTime('*/15 * * * *', refTime)
+
+        expect(nextTime).toBeGreaterThan(refTime)
+        const nextDate = new Date(nextTime)
+        expect(nextDate.getMinutes() % 15).toBe(0)
+    })
+
+    it('should correctly calculate midnight trigger time for daily schedule', () => {
+        const refTime = new Date('2026-05-10T14:30:00Z').getTime()
+        const nextTime = getNextExecutionTime('0 0 * * *', refTime)
+
+        expect(nextTime).toBeGreaterThan(refTime)
+        const nextDate = new Date(nextTime)
+        expect(nextDate.getHours()).toBe(0)
+        expect(nextDate.getMinutes()).toBe(0)
+    })
+
+    it('should throw when given an invalid cron string', () => {
+        const refTime = Date.now()
+        expect(() => getNextExecutionTime('not-a-cron', refTime)).toThrow()
+    })
+})
diff --git a/plugins/resend/index.test.ts b/plugins/resend/index.test.ts
new file mode 100644
index 0000000..ad46c14
--- /dev/null
+++ b/plugins/resend/index.test.ts
@@ -0,0 +1,88 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { ResendPlugin } from './index'
+
+describe('ResendPlugin - Initialization', () => {
+    it('should initialize with plugin name and optional apiKey', () => {
+        const pluginWithoutKey = new ResendPlugin()
+        expect(pluginWithoutKey.name).toBe('starbasedb:resend')
+        expect(pluginWithoutKey.opts.requiresAuth).toBe(false)
+        expect(pluginWithoutKey.apiKey).toBeUndefined()
+
+        const pluginWithKey = new ResendPlugin({ apiKey: 're_test_12345' })
+        expect(pluginWithKey.apiKey).toBe('re_test_12345')
+    })
+})
+
+describe('ResendPlugin - sendEmail()', () => {
+    const mockApiKey = 're_test_key_987'
+    let plugin: ResendPlugin
+
+    beforeEach(() => {
+        vi.restoreAllMocks()
+        plugin = new ResendPlugin({ apiKey: mockApiKey })
+    })
+
+    it('should make POST request to Resend API with correct headers and payload', async () => {
+        const mockResponseData = { id: 'email_id_123' }
+        const mockFetch = vi.fn().mockResolvedValue({
+            ok: true,
+            json: vi.fn().mockResolvedValue(mockResponseData),
+        })
+        global.fetch = mockFetch
+
+        const result = await plugin.sendEmail(
+            'sender@example.com',
+            ['recipient1@example.com', 'recipient2@example.com'],
+            'Test Subject',
+            '<p>Hello world</p>'
+        )
+
+        expect(result).toEqual(mockResponseData)
+        expect(mockFetch).toHaveBeenCalledTimes(1)
+        expect(mockFetch).toHaveBeenCalledWith(
+            'https://api.resend.com/emails',
+            {
+                method: 'POST',
+                headers: {
+                    Authorization: `Bearer ${mockApiKey}`,
+                    'Content-Type': 'application/json',
+                },
+                body: JSON.stringify({
+                    from: 'sender@example.com',
+                    to: ['recipient1@example.com', 'recipient2@example.com'],
+                    subject: 'Test Subject',
+                    html: '<p>Hello world</p>',
+                }),
+            }
+        )
+    })
+
+    it('should throw an error with API message when response is not ok', async () => {
+        const mockFetch = vi.fn().mockResolvedValue({
+            ok: false,
+            json: vi.fn().mockResolvedValue({ message: 'Domain not verified' }),
+        })
+        global.fetch = mockFetch
+
+        await expect(
+            plugin.sendEmail(
+                'unverified@domain.com',
+                ['user@example.com'],
+                'Alert',
+                'Body'
+            )
+        ).rejects.toThrow('Domain not verified')
+    })
+
+    it('should fallback to default error message when data.message is missing', async () => {
+        const mockFetch = vi.fn().mockResolvedValue({
+            ok: false,
+            json: vi.fn().mockResolvedValue({}),
+        })
+        global.fetch = mockFetch
+
+        await expect(
+            plugin.sendEmail('from@test.com', ['to@test.com'], 'Sub', 'Body')
+        ).rejects.toThrow('Failed to send email')
+    })
+})