Tests support

Machine also supports test code, which can be run parallel to machine and can test behaviour of each parts. Test code must be in *.spec.js files, always use javascript only in tests. You have access to same storage, and you can also use fetch, in case of fetch http://localhost will request machine itself. All test cases have to be wrapped by it function like in this example: Always wrap your cases to it function!

Functions in test code:

assert(condition: boolean)
it(caseName: string, async () => void)

Context in Tests vs HTTP Callbacks

In HTTP callbacks, you receive context through the req.context parameter:

async function uploadFile(req: ProcessedRequest) {
  await fetch(req.context, 'https://api.example.com/upload', { ... });
}

In test code, you use the machineContext variable directly:

it('Test upload', async () => {
  const result = await fetch(machineContext, 'http://localhost/uploadFile', { ... });
});

The machineContext is automatically available in test environment and provides the same functionality as req.context in HTTP callbacks.

Test code examples:

it('Setting', async () => {
  const result = await fetch(machineContext, 'http://localhost/testRequest', {
      method: 'post',
      headers: {
          'content-type': 'application/json'
      },
      body: JSON.stringify({
          text: 'Hello world'
      })
  })
  assert(result.status === 200)
})