test(osiris): test osiris features and ensure it works

Signed-off-by: Xe Iaso <me@xeiaso.net>

cmd/osiris/internal/entrypoint/h2c_test.go

@@ -0,0 +1,51 @@
+package entrypoint
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/h2c"
+)
+
+func newH2cServer(t *testing.T, h http.Handler) *httptest.Server {
+	t.Helper()
+
+	h2s := &http2.Server{}
+
+	srv := httptest.NewServer(h2c.NewHandler(h, h2s))
+	t.Cleanup(func() {
+		srv.Close()
+	})
+
+	return srv
+}
+
+func TestH2CReverseProxy(t *testing.T) {
+	h := &ackHandler{}
+
+	srv := newH2cServer(t, h)
+
+	u, err := url.Parse(srv.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	rp := httptest.NewServer(newH2CReverseProxy(u))
+	defer rp.Close()
+
+	resp, err := rp.Client().Get(rp.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("wrong status code from reverse proxy: %d", resp.StatusCode)
+	}
+
+	if !h.ack {
+		t.Error("h2c handler was not executed")
+	}
+}