​
Resp Object

You probably want to make assertions on things other than the response status! The entire response object looks like this:
JSON
{
    data: "...",
    status: 200,
    statusText: "OK",
    headers: {
        "content-type": "application/json",
        ...
    }
}

​
Complex Assertions

If you want to write more complex assertions you can use Javascript expressions instead of specifying a key and a value. If the expression resolves to a truthy value the assertion will pass, otherwise it will fail.
YAML
test:
  - request:
      method: GET
      url: https://example.com
    assert:
      - type: JS
        value: resp.status < 300

​
Environment Variables

You can specify environment variables in your test file to reuse values across your test. In this example we make an environment variable called CREDENTIALS. It can then be used anywhere in the test by using the string {{CREDENTIALS}}. 
env:
  - name: CREDENTIALS
    value: ...

test:
  - request:
      method: GET
      url: https://example.com
      headers:
        - name: Authorization
          value: '{{CREDENTIALS}}'
    assert:
      - type: JS
        value: resp.status < 300

​
Extractors

Instead of specifying an environment variable at the top level, you might want to dynamically create environment variables in each step of the test. You can do this with extractors.
YAML
env:
  - name: CREDENTIALS
    value: ...

test:
  - request:
      method: GET
      url: https://example.com
      headers:
        - name: Authorization
          value: "{{CREDENTIALS}}"
    extract:
      - name: example_data
        value: resp.data
    assert:
      - type: JS
        value: resp.status < 300
  - request:
      method: POST
      url: https://example.com
      data: "{{example_data}}"
      headers:
        - name: Authorization
          value: "{{CREDENTIALS}}"
    assert:
      - type: JS
        value: resp.status < 300