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package metrics
import (
"fmt"
"sync"
"testing"
)
func TestGaugeError(t *testing.T) {
expectPanic(t, "NewGauge_Set_non-nil-callback", func() {
g := NewGauge("NewGauge_non_nil_callback", func() float64 { return 123 })
g.Set(12.35)
})
expectPanic(t, "GetOrCreateGauge_Set_non-nil-callback", func() {
g := GetOrCreateGauge("GetOrCreateGauge_nil_callback", func() float64 { return 123 })
g.Set(42)
})
expectPanic(t, "GetOrCreateGauge_Add_non-nil-callback", func() {
g := GetOrCreateGauge("GetOrCreateGauge_nil_callback", func() float64 { return 123 })
g.Add(42)
})
expectPanic(t, "GetOrCreateGauge_Inc_non-nil-callback", func() {
g := GetOrCreateGauge("GetOrCreateGauge_nil_callback", func() float64 { return 123 })
g.Inc()
})
expectPanic(t, "GetOrCreateGauge_Dec_non-nil-callback", func() {
g := GetOrCreateGauge("GetOrCreateGauge_nil_callback", func() float64 { return 123 })
g.Dec()
})
}
func TestGaugeSet(t *testing.T) {
s := NewSet()
g := s.NewGauge("foo", nil)
if n := g.Get(); n != 0 {
t.Fatalf("unexpected gauge value: %g; expecting 0", n)
}
g.Set(1.234)
if n := g.Get(); n != 1.234 {
t.Fatalf("unexpected gauge value %g; expecting 1.234", n)
}
}
func TestGaugeIncDec(t *testing.T) {
s := NewSet()
g := s.NewGauge("foo", nil)
if n := g.Get(); n != 0 {
t.Fatalf("unexpected gauge value: %g; expecting 0", n)
}
for i := 1; i <= 100; i++ {
g.Inc()
if n := g.Get(); n != float64(i) {
t.Fatalf("unexpected gauge value %g; expecting %d", n, i)
}
}
for i := 99; i >= 0; i-- {
g.Dec()
if n := g.Get(); n != float64(i) {
t.Fatalf("unexpected gauge value %g; expecting %d", n, i)
}
}
}
func TestGaugeIncDecConcurrenc(t *testing.T) {
s := NewSet()
g := s.NewGauge("foo", nil)
workers := 5
var wg sync.WaitGroup
for i := 0; i < workers; i++ {
wg.Add(1)
go func() {
for i := 0; i < 100; i++ {
g.Inc()
g.Dec()
}
wg.Done()
}()
}
wg.Wait()
if n := g.Get(); n != 0 {
t.Fatalf("unexpected gauge value %g; want 0", n)
}
}
func TestGaugeSerial(t *testing.T) {
name := "GaugeSerial"
n := 1.23
var nLock sync.Mutex
g := NewGauge(name, func() float64 {
nLock.Lock()
defer nLock.Unlock()
n++
return n
})
for i := 0; i < 10; i++ {
if nn := g.Get(); nn != n {
t.Fatalf("unexpected gauge value; got %v; want %v", nn, n)
}
}
// Verify marshalTo
testMarshalTo(t, g, "foobar", "foobar 12.23\n")
// Verify big numbers marshaling
n = 1234567899
testMarshalTo(t, g, "prefix", "prefix 1234567900\n")
}
func TestGaugeConcurrent(t *testing.T) {
name := "GaugeConcurrent"
var n int
var nLock sync.Mutex
g := NewGauge(name, func() float64 {
nLock.Lock()
defer nLock.Unlock()
n++
return float64(n)
})
err := testConcurrent(func() error {
nPrev := g.Get()
for i := 0; i < 10; i++ {
if n := g.Get(); n <= nPrev {
return fmt.Errorf("gauge value must be greater than %v; got %v", nPrev, n)
}
}
return nil
})
if err != nil {
t.Fatal(err)
}
}
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