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package metrics
import (
"fmt"
"sync"
"testing"
)
func TestGaugeError(t *testing.T) {
expectPanic(t, "NewGauge_nil_callback", func() {
NewGauge("NewGauge_nil_callback", nil)
})
expectPanic(t, "GetOrCreateGauge_nil_callback", func() {
GetOrCreateGauge("GetOrCreateGauge_nil_callback", nil)
})
}
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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