add tests for the httplog package

Currently there are no tests for the httplog package. This patch adds
an initial set of tests and improves test coverage.

pkg/httplog/log_test.go

@@ -0,0 +1,67 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+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 httplog
+
+import (
+	"bytes"
+	"net/http"
+	"net/http/httptest"
+	"reflect"
+	"testing"
+)
+
+func TestHandler(t *testing.T) {
+	want := &httptest.ResponseRecorder{
+		HeaderMap: make(http.Header),
+		Body:      new(bytes.Buffer),
+	}
+	want.WriteHeader(http.StatusOK)
+	mux := http.NewServeMux()
+	handler := Handler(mux, DefaultStacktracePred)
+	mux.HandleFunc("/kube", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	})
+	req, err := http.NewRequest("GET", "http://example.com/kube", nil)
+	if err != nil {
+		t.Errorf("Unexpected error: %#v", err)
+	}
+	w := httptest.NewRecorder()
+	handler.ServeHTTP(w, req)
+	if !reflect.DeepEqual(want, w) {
+		t.Errorf("Expected %v, got %v", want, w)
+	}
+}
+
+var statusTestTable = []struct {
+	status   int
+	statuses []int
+	want     bool
+}{
+	{http.StatusOK, []int{}, true},
+	{http.StatusOK, []int{http.StatusOK}, false},
+	{http.StatusCreated, []int{http.StatusOK, http.StatusAccepted}, true},
+}
+
+func TestStatusIsNot(t *testing.T) {
+	for _, tt := range statusTestTable {
+		sp := StatusIsNot(tt.statuses...)
+		got := sp(tt.status)
+		if got != tt.want {
+			t.Errorf("Expected %v, got %v", tt.want, got)
+		}
+	}
+}