bbyars/mountebank

<p>Every response saves the time it took to call the downstream service in the
<code>_proxyResponseTime</code> field. You can tell mountebank to automatically
translate that into a <a href='/docs/api/behaviors#behavior-wait'>wait behavior</a>,
which will add the same latency to the saved response. This is a useful technique
during performance testing, where you want to virtualize downstream services but
still want realistic latencies.</p>

<testScenario name='waitBehavior'>
    <step type='http'>
<code class='hidden'>POST /imposters HTTP/1.1
Host: localhost:<%= port %>
Content-Type: application/json

{
  "port": 6001,
  "protocol": "http"
}</code>
    </step>

<p>Let's create the following proxy configuration:</p>

    <step type='http'>
<pre><code><span class='hidden'>POST /imposters HTTP/1.1
Host: localhost:<%= port %>
Content-Type: application/json

{
  "port": 6000,
  "protocol": "http",
</span>"stubs": [{
  "responses": [{
    "proxy": {
      "to": "<change to='http://localhost:6001'>http://origin-server.com</change>",
      <strong class='highlight1'>"addWaitBehavior": true</strong>
    }
  }]
}]<span class='hidden'>}</span></code></pre>
    </step>

<p>Next we'll send a request to our proxy imposter to create a new saved response:</p>

    <step type='http'>
<pre><code>GET / HTTP/1.1
Host: <change to='localhost:6000'>origin-server.com</change></code></pre>
    </step>

<p>If you look at the imposter configuration, you'll notice the new <code>wait</code>
behavior. The value will be the same as the <code>_proxyResponseTime</code> field, which
means that the saved response will add the same latency as the real service.</p>

    <step type='http'>
<code class='hidden'>GET /imposters/6000 HTTP/1.1
Host: localhost:<%= port %></code>

        <assertResponse partial='true'>
<pre><code><span class='hidden'>{
</span>"stubs": [
  {
    "predicates": [],
    "responses": [{
      "is": {
        "statusCode": 200,
        <change to=''>...</change>
        <strong class='highlight2'>"_proxyResponseTime": <volatile>219</volatile></strong>
      },
      <strong class='highlight1'>"behaviors": [
        {
          "wait": <volatile>219</volatile>
        }
      ]</strong>
    }]
  },
  {
    "responses": [{
      "proxy": {
        "to": "<change to='http://localhost:6001'>http://origin-server.com</change>",
        "addWaitBehavior": true
      }
    }]
  }
]<span class='hidden'>}</span></code></pre>
        </assertResponse>
    </step>

    <step type='http'>
<code class='hidden'>DELETE /imposters/6001 HTTP/1.1
Host: localhost:<%= port %>
Accept: application/json</code>
    </step>

    <step type='http'>
<code class='hidden'>DELETE /imposters/6000 HTTP/1.1
Host: localhost:<%= port %>
Accept: application/json</code>
    </step>
</testScenario>