test: allow specifying HTTP protocol (#822)

Signed-off-by: spacewander <spacewanderlzx@gmail.com>

test/e2e/conformance/utils/roundtripper/roundtripper_test.go

@@ -0,0 +1,77 @@
+// Copyright (c) 2022 Alibaba Group Holding Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package roundtripper
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"golang.org/x/net/http2"
+)
+
+func TestTransport(t *testing.T) {
+	req := Request{
+		Protocol: "HTTP/2.0",
+	}
+	tests := []struct {
+		name          string
+		req           Request
+		prevTransport http.RoundTripper
+		tlsConfig     *TLSConfig
+		transport     http.RoundTripper
+	}{
+		{
+			name: "default",
+			req:  Request{},
+		},
+		{
+			name:      "http2",
+			req:       req,
+			transport: &http2.Transport{},
+		},
+		{
+			name: "http1",
+			req: Request{
+				Protocol: "HTTP/1.1",
+			},
+		},
+		{
+			name: "https",
+			req:  req,
+			tlsConfig: &TLSConfig{
+				SNI: "www.example.com",
+			},
+			transport: &http2.Transport{
+				TLSClientConfig: &tls.Config{
+					RootCAs:            x509.NewCertPool(),
+					ServerName:         "www.example.com",
+					InsecureSkipVerify: true,
+				},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			d := DefaultRoundTripper{}
+			c := http.Client{}
+			d.initTransport(&c, tt.req.Protocol, tt.tlsConfig)
+			assert.Equal(t, tt.transport, c.Transport)
+		})
+	}
+}