feat(http): generate an empty response if no matching response if fou…

…nd for chaos

packages/http/src/mocker/negotiator/NegotiatorHelpers.ts

@@ -250,6 +250,15 @@ const helpers = {
     );
   },
 
+  negotiateEmptyResponse(code: number): RE.ReaderEither<Logger, Error, IHttpNegotiationResult> {
+    return withLogger(() =>
+      pipe(
+        createEmptyResponse(String(code), [], ['*/*']),
+        E.fromOption(() => new Error(`Unable to create an empty response for ${code}`))
+      )
+    );
+  },
+
   negotiateOptionsBySpecificCode(
     httpOperation: IHttpOperation,
     desiredOptions: NegotiationOptions,
@@ -304,7 +313,11 @@ const helpers = {
             O.map(chaos => chaos.codes as NonEmptyArray<number>),
             O.fold(
               () => helpers.negotiateOptionsForUnspecifiedCode(httpOperation, desiredOptions),
-              statusCodes => helpers.negotiateOptionsForErrorCodes(httpOperation, desiredOptions, statusCodes)
+              statusCodes =>
+                pipe(
+                  helpers.negotiateOptionsForErrorCodes(httpOperation, desiredOptions, statusCodes),
+                  RE.orElse(() => helpers.negotiateEmptyResponse(statusCodes[0]))
+                )
             )
           ),
         code => helpers.negotiateOptionsBySpecificCode(httpOperation, desiredOptions, code)

test-harness/specs/config/chaos_missing_codes.txt

@@ -0,0 +1,38 @@
+====test====
+Given I mock and specify a missing error code for chaos
+When I send a request to an operation
+Then the response should be blank with that status code
+====spec====
+openapi: "3.1.0"
+info:
+  version: "0.0"
+  title: Config Test
+paths:
+  /pets/{petId}:
+    get:
+      description: Get a pet by ID
+      responses:
+        "200":
+          description: A pet
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  name:
+                    type: string
+====config====
+{
+    "chaos": {
+      "enabled": true,
+      "rate": 100,
+      "codes": [401]
+    }
+}
+====server====
+mock -p 4010 --config ${config} ${document}
+====command====
+curl -i http://localhost:4010/pets/2
+====expect====
+HTTP/1.1 401 Unauthorized
+Content-Length: 0