Moved memory-cached and disk-cached discovery to their own packages

Kubernetes-commit: 6666049898f93932655fef24f807bc4d6e439fc6

discovery/cached/disk/round_tripper_test.go

@@ -0,0 +1,95 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+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 disk
+
+import (
+	"bytes"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"os"
+	"testing"
+)
+
+// copied from k8s.io/client-go/transport/round_trippers_test.go
+type testRoundTripper struct {
+	Request  *http.Request
+	Response *http.Response
+	Err      error
+}
+
+func (rt *testRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
+	rt.Request = req
+	return rt.Response, rt.Err
+}
+
+func TestCacheRoundTripper(t *testing.T) {
+	rt := &testRoundTripper{}
+	cacheDir, err := ioutil.TempDir("", "cache-rt")
+	defer os.RemoveAll(cacheDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	cache := newCacheRoundTripper(cacheDir, rt)
+
+	// First call, caches the response
+	req := &http.Request{
+		Method: http.MethodGet,
+		URL:    &url.URL{Host: "localhost"},
+	}
+	rt.Response = &http.Response{
+		Header:     http.Header{"ETag": []string{`"123456"`}},
+		Body:       ioutil.NopCloser(bytes.NewReader([]byte("Content"))),
+		StatusCode: http.StatusOK,
+	}
+	resp, err := cache.RoundTrip(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	content, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(content) != "Content" {
+		t.Errorf(`Expected Body to be "Content", got %q`, string(content))
+	}
+
+	// Second call, returns cached response
+	req = &http.Request{
+		Method: http.MethodGet,
+		URL:    &url.URL{Host: "localhost"},
+	}
+	rt.Response = &http.Response{
+		StatusCode: http.StatusNotModified,
+		Body:       ioutil.NopCloser(bytes.NewReader([]byte("Other Content"))),
+	}
+
+	resp, err = cache.RoundTrip(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Read body and make sure we have the initial content
+	content, err = ioutil.ReadAll(resp.Body)
+	resp.Body.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(content) != "Content" {
+		t.Errorf("Invalid content read from cache %q", string(content))
+	}
+}