Function TestHandleFederationQuery_Service

core/federation_dispatch_test.go:42–76

TestHandleFederationQuery_Service verifies the runtime path that makes GraphJin a valid Apollo subgraph: a `_service { sdl }` query must be intercepted before the regular compile pipeline and answered with the federation-flavoured SDL wrapped in the expected JSON shape.

(t *testing.T)

// must be intercepted before the regular compile pipeline and answered
// with the federation-flavoured SDL wrapped in the expected JSON shape.
func TestHandleFederationQuery_Service(t *testing.T) {
	gj := fedTestEngine(t)

	handled, data, err := gj.handleFederationQuery(GraphqlReq{
		query: []byte(`query { _service { sdl } }`),
	})
	if !handled {
		t.Fatalf("expected handled=true for _service query")
	}
	if err != nil {
		t.Fatalf("unexpected err: %v", err)
	}

	var resp struct {
		Service struct {
			SDL string `json:"sdl"`
		} `json:"_service"`
	}
	if err := json.Unmarshal(data, &resp); err != nil {
		t.Fatalf("response is not the _service envelope: %v\n%s", err, data)
	}
	if resp.Service.SDL == "" {
		t.Fatalf("expected non-empty SDL, got %s", data)
	}
	for _, want := range []string{
		"@link(url:",
		"@key(fields:",
		"_Service",
		"_entities",
	} {
		if !strings.Contains(resp.Service.SDL, want) {
			t.Errorf("SDL missing %q\n----\n%s\n----", want, resp.Service.SDL)
		}
	}
}

// TestHandleFederationQuery_Entities verifies that `_entities` queries
// return the documented "not yet implemented" error rather than silently