Add zero allocation guarantee tests

allocation_test.go

@@ -0,0 +1,70 @@
+// +build !race
+
+package fasthttp
+
+import (
+	"net"
+
+	"testing"
+)
+
+func TestAllocationServeConn(t *testing.T) {
+	s := &Server{
+		Handler: func(ctx *RequestCtx) {
+		},
+	}
+
+	rw := &readWriter{}
+	// Make space for the request and response here so it
+	// doesn't allocate within the test.
+	rw.r.Grow(1024)
+	rw.w.Grow(1024)
+
+	n := testing.AllocsPerRun(100, func() {
+		rw.r.WriteString("GET / HTTP/1.1\r\nHost: google.com\r\nCookie: foo=bar\r\n\r\n")
+		if err := s.ServeConn(rw); err != nil {
+			t.Fatal(err)
+		}
+
+		// Reset the write buffer to make space for the next response.
+		rw.w.Reset()
+	})
+
+	if n != 0 {
+		t.Fatalf("expected 0 allocations, got %f", n)
+	}
+}
+
+func TestAllocationClient(t *testing.T) {
+	ln, err := net.Listen("tcp4", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("cannot listen: %s", err)
+	}
+	defer ln.Close()
+
+	s := &Server{
+		Handler: func(ctx *RequestCtx) {
+		},
+	}
+	go s.Serve(ln)
+
+	c := &Client{}
+	url := "http://" + ln.Addr().String()
+
+	n := testing.AllocsPerRun(100, func() {
+		req := AcquireRequest()
+		res := AcquireResponse()
+
+		req.SetRequestURI(url)
+		if err := c.Do(req, res); err != nil {
+			t.Fatal(err)
+		}
+
+		ReleaseRequest(req)
+		ReleaseResponse(res)
+	})
+
+	if n != 0 {
+		t.Fatalf("expected 0 allocations, got %f", n)
+	}
+}