start server before running e2e test

[ktong]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

start server before running e2e test.

• What is the current behavior? (You can also link to an open issue here)

To run e2e test, you have to start & stop server by manual.

• What is the new behavior (if this is a feature change)?

Automatically start & stop server when running e2e test.

• Other information:

[ktong]

please use the simple one #447