Add a benchmark

go test -benchtime=5s -bench=. -benchmem
goos: linux
goarch: amd64
pkg: github.com/99designs/gqlgen/example/starwars
BenchmarkSimpleQueryNoArgs-8      200000             32680 ns/op            6357 B/op        126 allocs/op
PASS
ok      github.com/99designs/gqlgen/example/starwars    9.901s

.gitignore

@@ -7,3 +7,5 @@
 /codegen/gen
 
 .idea/
+*.test
+*.out

example/starwars/benchmarks_test.go

@@ -0,0 +1,30 @@
+package starwars
+
+import (
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/99designs/gqlgen/handler"
+)
+
+func BenchmarkSimpleQueryNoArgs(b *testing.B) {
+	server := handler.GraphQL(NewExecutableSchema(NewResolver()))
+
+	q := `{"query":"{ search(text:\"Luke\") { ... on Human { starships { name } } } }"}`
+
+	var body strings.Reader
+	r := httptest.NewRequest("POST", "/graphql", &body)
+
+	b.ResetTimer()
+	rec := httptest.NewRecorder()
+	for i := 0; i < b.N; i++ {
+		body.Reset(q)
+		rec.Body.Reset()
+		server.ServeHTTP(rec, r)
+		if rec.Body.String() != `{"data":{"search":[{"starships":[{"name":"X-Wing"},{"name":"Imperial shuttle"}]}]}}` {
+			b.Fatalf("Unexpected response")
+		}
+
+	}
+}