update copy and add test for resp content type

Author: msutkowski

lib/open_api_spex/test/test_assertions.ex

@@ -167,7 +167,7 @@ defmodule OpenApiSpex.TestAssertions do
 
       if is_nil(resolved_schema) do
         flunk(
-          "Failed to resolve schema! Unable to find a response for operation_id: #{operation_id} for response status code: #{conn.status} and content type #{content_type}"
+          "Failed to resolve schema! Unable to find a response schema for operation_id: #{operation_id} for status code: #{conn.status} and content type: #{content_type}"
         )
       end
 

test/test_assertions_test.exs

@@ -158,5 +158,26 @@ defmodule OpenApiSpex.TestAssertionsTest do
                    "Value does not conform to schema PetResponse: Failed to cast value to one of: no schemas validate at"
       end
     end
+
+    test "returns an error when the response content-type does not match the schema" do
+      conn =
+        :get
+        |> Plug.Test.conn("/api/pets")
+        |> Plug.Conn.put_req_header("content-type", "application/json")
+        |> Plug.Conn.put_resp_header("content-type", "unexpected-content-type")
+
+      conn = OpenApiSpexTest.Router.call(conn, [])
+
+      assert conn.status == 200
+
+      try do
+        TestAssertions.assert_operation_response(conn, "showPetById")
+        raise RuntimeError, "Should flunk"
+      rescue
+        e in ExUnit.AssertionError ->
+          assert e.message =~
+                   "Failed to resolve schema! Unable to find a response schema for operation_id: showPetById for status code: 200 and content type: unexpected-content-type"
+      end
+    end
   end
 end