helper method to create HTTP response with code

Added a helper method to create `HTTP.Response` with a HTTP code and a `APIModel` instance.

```julia
HTTP.Response(code::Integer, o::APIModel)
```

Author: tanmaykm

src/server.jl

@@ -109,6 +109,10 @@ function to_param(T, source::Vector{HTTP.Forms.Multipart}, name::String; require
     end
 end
 
+function HTTP.Response(code::Integer, o::APIModel)
+    return HTTP.Response(code, [Pair("Content-Type", "application/json")], to_json(o))
+end
+
 server_response(resp::HTTP.Response) = resp
 server_response(::Nothing) = server_response("")
 server_response(ret) =

test/client/allany/runtests.jl

@@ -4,6 +4,7 @@ include(joinpath(@__DIR__, "AllAnyClient", "src", "AllAnyClient.jl"))
 using .AllAnyClient
 using Test
 using JSON
+using HTTP
 using OpenAPI
 using OpenAPI.Clients
 import OpenAPI.Clients: Client
@@ -146,4 +147,13 @@ function test_debug()
     end
 end
 
+function test_http_resp()
+    resp = HTTP.Response(200, dog)
+
+    @test resp.status == 200
+    @test resp.headers == ["Content-Type" => "application/json"]
+    json = JSON.parse(String(copy(resp.body)))
+    @test pet_equals(OpenAPI.Clients.from_json(M.Dog, json), dog)
+end
+
 end # module AllAnyTests

test/runtests.jl

@@ -149,4 +149,8 @@ include("forms/forms_client.jl")
             run_tests_with_servers && servers_running && stop_server(8081, ret, out)
         end
     end
+
+    @testset "Helper Methods" begin
+        AllAnyTests.test_http_resp()
+    end
 end