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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package expvar
import (
"bytes"
"encoding/json"
"net/http/httptest"
"strconv"
"testing"
)
// RemoveAll removes all exported variables.
// This is for tests only.
func RemoveAll() {
mutex.Lock()
defer mutex.Unlock()
vars = make(map[string]Var)
varKeys = nil
}
func TestInt(t *testing.T) {
RemoveAll()
reqs := NewInt("requests")
if reqs.i != 0 {
t.Errorf("reqs.i = %v, want 0", reqs.i)
}
if reqs != Get("requests").(*Int) {
t.Errorf("Get() failed.")
}
reqs.Add(1)
reqs.Add(3)
if reqs.i != 4 {
t.Errorf("reqs.i = %v, want 4", reqs.i)
}
if s := reqs.String(); s != "4" {
t.Errorf("reqs.String() = %q, want \"4\"", s)
}
reqs.Set(-2)
if reqs.i != -2 {
t.Errorf("reqs.i = %v, want -2", reqs.i)
}
}
func TestFloat(t *testing.T) {
RemoveAll()
reqs := NewFloat("requests-float")
if reqs.f != 0.0 {
t.Errorf("reqs.f = %v, want 0", reqs.f)
}
if reqs != Get("requests-float").(*Float) {
t.Errorf("Get() failed.")
}
reqs.Add(1.5)
reqs.Add(1.25)
if reqs.f != 2.75 {
t.Errorf("reqs.f = %v, want 2.75", reqs.f)
}
if s := reqs.String(); s != "2.75" {
t.Errorf("reqs.String() = %q, want \"4.64\"", s)
}
reqs.Add(-2)
if reqs.f != 0.75 {
t.Errorf("reqs.f = %v, want 0.75", reqs.f)
}
}
func TestString(t *testing.T) {
RemoveAll()
name := NewString("my-name")
if name.s != "" {
t.Errorf("name.s = %q, want \"\"", name.s)
}
name.Set("Mike")
if name.s != "Mike" {
t.Errorf("name.s = %q, want \"Mike\"", name.s)
}
if s := name.String(); s != "\"Mike\"" {
t.Errorf("reqs.String() = %q, want \"\"Mike\"\"", s)
}
}
func TestMapCounter(t *testing.T) {
RemoveAll()
colors := NewMap("bike-shed-colors")
colors.Add("red", 1)
colors.Add("red", 2)
colors.Add("blue", 4)
colors.AddFloat(`green "midori"`, 4.125)
if x := colors.m["red"].(*Int).i; x != 3 {
t.Errorf("colors.m[\"red\"] = %v, want 3", x)
}
if x := colors.m["blue"].(*Int).i; x != 4 {
t.Errorf("colors.m[\"blue\"] = %v, want 4", x)
}
if x := colors.m[`green "midori"`].(*Float).f; x != 4.125 {
t.Errorf("colors.m[`green \"midori\"] = %v, want 3.14", x)
}
// colors.String() should be '{"red":3, "blue":4}',
// though the order of red and blue could vary.
s := colors.String()
var j interface{}
err := json.Unmarshal([]byte(s), &j)
if err != nil {
t.Errorf("colors.String() isn't valid JSON: %v", err)
}
m, ok := j.(map[string]interface{})
if !ok {
t.Error("colors.String() didn't produce a map.")
}
red := m["red"]
x, ok := red.(float64)
if !ok {
t.Error("red.Kind() is not a number.")
}
if x != 3 {
t.Errorf("red = %v, want 3", x)
}
}
func TestFunc(t *testing.T) {
RemoveAll()
var x interface{} = []string{"a", "b"}
f := Func(func() interface{} { return x })
if s, exp := f.String(), `["a","b"]`; s != exp {
t.Errorf(`f.String() = %q, want %q`, s, exp)
}
x = 17
if s, exp := f.String(), `17`; s != exp {
t.Errorf(`f.String() = %q, want %q`, s, exp)
}
}
func TestHandler(t *testing.T) {
RemoveAll()
m := NewMap("map1")
m.Add("a", 1)
m.Add("z", 2)
m2 := NewMap("map2")
for i := 0; i < 9; i++ {
m2.Add(strconv.Itoa(i), int64(i))
}
rr := httptest.NewRecorder()
rr.Body = new(bytes.Buffer)
expvarHandler(rr, nil)
want := `{
"map1": {"a": 1, "z": 2},
"map2": {"0": 0, "1": 1, "2": 2, "3": 3, "4": 4, "5": 5, "6": 6, "7": 7, "8": 8}
}
`
if got := rr.Body.String(); got != want {
t.Errorf("HTTP handler wrote:\n%s\nWant:\n%s", got, want)
}
}
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