Can't tell if an assertion has been violated from CLI's output

[Pamplemousse]

When running from the CLI, it would be nice if:

• The script returned an error when an assertion has been violated;
• It would be possible for ZestAssertion to have an optional message field to have something to display if violated.

---

As of now, one can't tell if an ZestAssertion has been violated or not.

Here is a simple script.zst that I am using:

{
  "about": "This is a Zest script. For more details about Zest visit https://developer.mozilla.org/en-US/docs/Zest",
  "zestVersion": "0.8",
  "generatedBy": "OWASP ZAP Dev Build",
  "title": "Simple GET request",
  "description": "This Zest script is very humble.",
  "statements": [
    {
      "url": "http://juice-shop.herokuapp.com",
      "method": "GET",
      "assertions": [
        {
          "rootExpression": {
            "code": 200,
            "not": false,
            "elementType": "ZestExpressionStatusCode"
          },
          "elementType": "ZestAssertion"
        }
      ],
      "followRedirects": true,
      "index": 1,
      "enabled": true,
      "elementType": "ZestRequest"
    }
  ],
  "index": 0,
  "enabled": true,
  "elementType": "ZestScript"
}

When running this script with different values - true, and false - for the not field of the ZestAssertion, I always get the same result:

[nix-shell:~/Workspace/tools/zap/zest/zest]$ build/distributions/zest-0.15.0-SNAPSHOT/bin/zest -script examples/script.zst

[nix-shell:~/Workspace/tools/zap/zest/zest]$ echo $?
0