vitess.io/vitess@v0.16.2/go/stats/export_test.go (about)

     1  /*
     2  Copyright 2019 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package stats
    18  
    19  import (
    20  	"expvar"
    21  	"reflect"
    22  	"testing"
    23  )
    24  
    25  func clear() {
    26  	defaultVarGroup.vars = make(map[string]expvar.Var)
    27  	defaultVarGroup.newVarHook = nil
    28  	combineDimensions = ""
    29  	dropVariables = ""
    30  	combinedDimensions = nil
    31  	droppedVars = nil
    32  }
    33  
    34  func TestNoHook(t *testing.T) {
    35  	clear()
    36  	v := NewCounter("plainint", "help")
    37  	v.Add(1)
    38  	if v.String() != "1" {
    39  		t.Errorf("want 1, got %s", v.String())
    40  	}
    41  }
    42  
    43  func TestString(t *testing.T) {
    44  	var gotname string
    45  	var gotv *String
    46  	clear()
    47  	Register(func(name string, v expvar.Var) {
    48  		gotname = name
    49  		gotv = v.(*String)
    50  	})
    51  	v := NewString("String")
    52  	if gotname != "String" {
    53  		t.Errorf("want String, got %s", gotname)
    54  	}
    55  	if gotv != v {
    56  		t.Errorf("want %#v, got %#v", v, gotv)
    57  	}
    58  	v.Set("a\"b")
    59  	if v.Get() != "a\"b" {
    60  		t.Errorf("want \"a\"b\", got %#v", gotv)
    61  	}
    62  	if v.String() != "\"a\\\"b\"" {
    63  		t.Errorf("want \"\"a\\\"b\"\", got %#v", gotv)
    64  	}
    65  
    66  	f := StringFunc(func() string {
    67  		return "a"
    68  	})
    69  	if f.String() != "\"a\"" {
    70  		t.Errorf("want \"a\", got %v", f.String())
    71  	}
    72  }
    73  
    74  type Mystr string
    75  
    76  func (m *Mystr) String() string {
    77  	return string(*m)
    78  }
    79  
    80  func TestPublish(t *testing.T) {
    81  	var gotname string
    82  	var gotv expvar.Var
    83  	clear()
    84  	Register(func(name string, v expvar.Var) {
    85  		gotname = name
    86  		gotv = v.(*Mystr)
    87  	})
    88  	v := Mystr("abcd")
    89  	Publish("Mystr", &v)
    90  	if gotname != "Mystr" {
    91  		t.Errorf("want Mystr, got %s", gotname)
    92  	}
    93  	if gotv != &v {
    94  		t.Errorf("want %#v, got %#v", &v, gotv)
    95  	}
    96  }
    97  
    98  func f() string {
    99  	return "abcd"
   100  }
   101  
   102  type expvarFunc func() string
   103  
   104  func (f expvarFunc) String() string {
   105  	return f()
   106  }
   107  
   108  func TestPublishFunc(t *testing.T) {
   109  	var gotname string
   110  	var gotv expvarFunc
   111  	clear()
   112  	Register(func(name string, v expvar.Var) {
   113  		gotname = name
   114  		gotv = v.(expvarFunc)
   115  	})
   116  	publish("Myfunc", expvarFunc(f))
   117  	if gotname != "Myfunc" {
   118  		t.Errorf("want Myfunc, got %s", gotname)
   119  	}
   120  	if gotv.String() != f() {
   121  		t.Errorf("want %v, got %#v", f(), gotv())
   122  	}
   123  }
   124  
   125  func TestDropVariable(t *testing.T) {
   126  	clear()
   127  	dropVariables = "dropTest"
   128  
   129  	// This should not panic.
   130  	_ = NewGaugesWithSingleLabel("dropTest", "help", "label")
   131  	_ = NewGaugesWithSingleLabel("dropTest", "help", "label")
   132  }
   133  
   134  func TestStringMapToString(t *testing.T) {
   135  	expected1 := "{\"aaa\": \"111\", \"bbb\": \"222\"}"
   136  	expected2 := "{\"bbb\": \"222\", \"aaa\": \"111\"}"
   137  	got := stringMapToString(map[string]string{"aaa": "111", "bbb": "222"})
   138  
   139  	if got != expected1 && got != expected2 {
   140  		t.Errorf("expected %v or %v, got  %v", expected1, expected2, got)
   141  	}
   142  }
   143  
   144  func TestParseCommonTags(t *testing.T) {
   145  	res := ParseCommonTags([]string{""})
   146  	if len(res) != 0 {
   147  		t.Errorf("expected empty result, got %v", res)
   148  	}
   149  	res = ParseCommonTags([]string{"s", "a:b"})
   150  	expected1 := map[string]string{"a": "b"}
   151  	if !reflect.DeepEqual(expected1, res) {
   152  		t.Errorf("expected %v, got %v", expected1, res)
   153  	}
   154  	res = ParseCommonTags([]string{"a:b", "c:d"})
   155  	expected2 := map[string]string{"a": "b", "c": "d"}
   156  	if !reflect.DeepEqual(expected2, res) {
   157  		t.Errorf("expected %v, got %v", expected2, res)
   158  	}
   159  }