How to test a microservice by mocking the dependencies?

I've a RESTFul microservice written in Grails. This microservice has it's own DB. It also depends on two other microservices.

A typical workflow of the service is:

1. Receives a GET request from a client e.g. browser
2. Calls another microservice throw http to get some information
3. Queries it's own DB to get some data
4. Send a response to the client

I want to write automated tests for this service. Whenever I'll run the test, it'll do the following:

• Mock the external microservices
• Create a database and populate it with test data
• Run the application and configure it to use the mock services and DB
• Run the test cases by sending http requests and matching responses

Here are my questions:

• What type of test is this?
• What are some good frameworks or tools to write this type of test?

I'm not a QA so may be I'm asking stupid questions.