diff --git a/src/dynamodb.ts b/src/dynamodb.ts
index c19e6fb..4258b50 100644
--- a/src/dynamodb.ts
+++ b/src/dynamodb.ts
@@ -13,7 +13,8 @@ import { exists } from './utils'
 
 const debug = Debug('dynamodb-local')
 const JARNAME = 'DynamoDBLocal.jar'
-const runningProcesses: { [port: number]: Subprocess } = {}
+
+export const runningProcesses: { [port: number]: Subprocess } = {}
 
 export const dynamoDb = {
   async launch(options?: LaunchOptions): Promise<Subprocess | undefined> {
diff --git a/test/toolkit.test.ts b/test/toolkit.test.ts
index c8c8266..3815719 100644
--- a/test/toolkit.test.ts
+++ b/test/toolkit.test.ts
@@ -1,7 +1,101 @@
-import { describe, expect, it } from 'bun:test'
+import { afterAll, beforeAll, describe, expect, it, mock } from 'bun:test'
+import * as fs from 'node:fs'
+import * as path from 'node:path'
+import { config } from '../src/config'
+import { dynamoDb, runningProcesses } from '../src/dynamodb'
+import { exists } from '../src/utils'
+
+// Mock external dependencies
+mock.module('node:https', () => ({
+  get: mock(() => ({
+    on: mock(() => {}),
+    pipe: mock(() => ({
+      pipe: mock(() => ({
+        on: mock(() => {}),
+      })),
+    })),
+  })),
+}))
 
 describe('dynamodb-tooling', () => {
-  it('exported', () => {
-    expect(1).toEqual(1)
+  describe('Config', () => {
+    it('should load default config', () => {
+      expect(config).toBeDefined()
+      expect(config.port).toBe(8000)
+      expect(config.installPath).toBe('dynamodb-local')
+    })
+  })
+
+  describe('DynamoDB Local', () => {
+    const testPort = 8001
+    let process: any
+    const originalInstall = dynamoDb.install
+
+    beforeAll(async () => {
+      // Ensure the install directory exists for testing
+      await fs.promises.mkdir(config.installPath, { recursive: true })
+      // Create a mock JAR file
+      await fs.promises.writeFile(path.join(config.installPath, 'DynamoDBLocal.jar'), '')
+
+      // Mock the install method
+      dynamoDb.install = mock(async () => {
+        await fs.promises.writeFile(path.join(config.installPath, 'DynamoDBLocal.jar'), '')
+      })
+    })
+
+    afterAll(async () => {
+      // Clean up the test install directory
+      await fs.promises.rm(config.installPath, { recursive: true, force: true })
+      // Restore the original install method
+      dynamoDb.install = originalInstall
+    })
+
+    it('should launch DynamoDB Local', async () => {
+      process = await dynamoDb.launch({ port: testPort })
+      expect(process).toBeDefined()
+      expect(process.pid).toBeDefined()
+    })
+
+    it('should not launch a second instance on the same port', async () => {
+      const secondProcess = await dynamoDb.launch({ port: testPort })
+      expect(secondProcess).toBe(process)
+    })
+
+    it('should stop DynamoDB Local', () => {
+      dynamoDb.stop(testPort)
+      expect(runningProcesses[testPort]).toBeUndefined()
+    })
+
+    it('should install DynamoDB Local', async () => {
+      // Remove the mock JAR file to test installation
+      await fs.promises.unlink(path.join(config.installPath, 'DynamoDBLocal.jar'))
+
+      await dynamoDb.install()
+      const jarExists = await exists(path.join(config.installPath, 'DynamoDBLocal.jar'))
+      expect(jarExists).toBe(true)
+      expect(dynamoDb.install).toHaveBeenCalled()
+    })
+  })
+
+  describe('Utils', () => {
+    const testDir = 'test-utils-dir'
+
+    beforeAll(async () => {
+      await fs.promises.mkdir(testDir, { recursive: true })
+    })
+
+    afterAll(async () => {
+      await fs.promises.rm(testDir, { recursive: true, force: true })
+    })
+
+    it('should check if a file exists', async () => {
+      const existingFile = path.join(testDir, 'test-file.txt')
+      await fs.promises.writeFile(existingFile, '')
+
+      expect(await exists(existingFile)).toBe(true)
+      expect(await exists(path.join(testDir, 'non-existent-file.txt'))).toBe(false)
+
+      await fs.promises.unlink(existingFile)
+    })
   })
 })