github.com/tcnksm/go@v0.0.0-20141208075154-439b32936367/src/expvar/expvar_test.go (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package expvar
     6  
     7  import (
     8  	"bytes"
     9  	"encoding/json"
    10  	"net/http/httptest"
    11  	"strconv"
    12  	"testing"
    13  )
    14  
    15  // RemoveAll removes all exported variables.
    16  // This is for tests only.
    17  func RemoveAll() {
    18  	mutex.Lock()
    19  	defer mutex.Unlock()
    20  	vars = make(map[string]Var)
    21  	varKeys = nil
    22  }
    23  
    24  func TestInt(t *testing.T) {
    25  	RemoveAll()
    26  	reqs := NewInt("requests")
    27  	if reqs.i != 0 {
    28  		t.Errorf("reqs.i = %v, want 0", reqs.i)
    29  	}
    30  	if reqs != Get("requests").(*Int) {
    31  		t.Errorf("Get() failed.")
    32  	}
    33  
    34  	reqs.Add(1)
    35  	reqs.Add(3)
    36  	if reqs.i != 4 {
    37  		t.Errorf("reqs.i = %v, want 4", reqs.i)
    38  	}
    39  
    40  	if s := reqs.String(); s != "4" {
    41  		t.Errorf("reqs.String() = %q, want \"4\"", s)
    42  	}
    43  
    44  	reqs.Set(-2)
    45  	if reqs.i != -2 {
    46  		t.Errorf("reqs.i = %v, want -2", reqs.i)
    47  	}
    48  }
    49  
    50  func TestFloat(t *testing.T) {
    51  	RemoveAll()
    52  	reqs := NewFloat("requests-float")
    53  	if reqs.f != 0.0 {
    54  		t.Errorf("reqs.f = %v, want 0", reqs.f)
    55  	}
    56  	if reqs != Get("requests-float").(*Float) {
    57  		t.Errorf("Get() failed.")
    58  	}
    59  
    60  	reqs.Add(1.5)
    61  	reqs.Add(1.25)
    62  	if reqs.f != 2.75 {
    63  		t.Errorf("reqs.f = %v, want 2.75", reqs.f)
    64  	}
    65  
    66  	if s := reqs.String(); s != "2.75" {
    67  		t.Errorf("reqs.String() = %q, want \"4.64\"", s)
    68  	}
    69  
    70  	reqs.Add(-2)
    71  	if reqs.f != 0.75 {
    72  		t.Errorf("reqs.f = %v, want 0.75", reqs.f)
    73  	}
    74  }
    75  
    76  func TestString(t *testing.T) {
    77  	RemoveAll()
    78  	name := NewString("my-name")
    79  	if name.s != "" {
    80  		t.Errorf("name.s = %q, want \"\"", name.s)
    81  	}
    82  
    83  	name.Set("Mike")
    84  	if name.s != "Mike" {
    85  		t.Errorf("name.s = %q, want \"Mike\"", name.s)
    86  	}
    87  
    88  	if s := name.String(); s != "\"Mike\"" {
    89  		t.Errorf("reqs.String() = %q, want \"\"Mike\"\"", s)
    90  	}
    91  }
    92  
    93  func TestMapCounter(t *testing.T) {
    94  	RemoveAll()
    95  	colors := NewMap("bike-shed-colors")
    96  
    97  	colors.Add("red", 1)
    98  	colors.Add("red", 2)
    99  	colors.Add("blue", 4)
   100  	colors.AddFloat(`green "midori"`, 4.125)
   101  	if x := colors.m["red"].(*Int).i; x != 3 {
   102  		t.Errorf("colors.m[\"red\"] = %v, want 3", x)
   103  	}
   104  	if x := colors.m["blue"].(*Int).i; x != 4 {
   105  		t.Errorf("colors.m[\"blue\"] = %v, want 4", x)
   106  	}
   107  	if x := colors.m[`green "midori"`].(*Float).f; x != 4.125 {
   108  		t.Errorf("colors.m[`green \"midori\"] = %v, want 3.14", x)
   109  	}
   110  
   111  	// colors.String() should be '{"red":3, "blue":4}',
   112  	// though the order of red and blue could vary.
   113  	s := colors.String()
   114  	var j interface{}
   115  	err := json.Unmarshal([]byte(s), &j)
   116  	if err != nil {
   117  		t.Errorf("colors.String() isn't valid JSON: %v", err)
   118  	}
   119  	m, ok := j.(map[string]interface{})
   120  	if !ok {
   121  		t.Error("colors.String() didn't produce a map.")
   122  	}
   123  	red := m["red"]
   124  	x, ok := red.(float64)
   125  	if !ok {
   126  		t.Error("red.Kind() is not a number.")
   127  	}
   128  	if x != 3 {
   129  		t.Errorf("red = %v, want 3", x)
   130  	}
   131  }
   132  
   133  func TestFunc(t *testing.T) {
   134  	RemoveAll()
   135  	var x interface{} = []string{"a", "b"}
   136  	f := Func(func() interface{} { return x })
   137  	if s, exp := f.String(), `["a","b"]`; s != exp {
   138  		t.Errorf(`f.String() = %q, want %q`, s, exp)
   139  	}
   140  
   141  	x = 17
   142  	if s, exp := f.String(), `17`; s != exp {
   143  		t.Errorf(`f.String() = %q, want %q`, s, exp)
   144  	}
   145  }
   146  
   147  func TestHandler(t *testing.T) {
   148  	RemoveAll()
   149  	m := NewMap("map1")
   150  	m.Add("a", 1)
   151  	m.Add("z", 2)
   152  	m2 := NewMap("map2")
   153  	for i := 0; i < 9; i++ {
   154  		m2.Add(strconv.Itoa(i), int64(i))
   155  	}
   156  	rr := httptest.NewRecorder()
   157  	rr.Body = new(bytes.Buffer)
   158  	expvarHandler(rr, nil)
   159  	want := `{
   160  "map1": {"a": 1, "z": 2},
   161  "map2": {"0": 0, "1": 1, "2": 2, "3": 3, "4": 4, "5": 5, "6": 6, "7": 7, "8": 8}
   162  }
   163  `
   164  	if got := rr.Body.String(); got != want {
   165  		t.Errorf("HTTP handler wrote:\n%s\nWant:\n%s", got, want)
   166  	}
   167  }