metrics/json_test.go


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package metrics

import (
    "bytes"
    "encoding/json"
    "testing"
)

func TestRegistryMarshallJSON(t *testing.T) {
    b := &bytes.Buffer{}
    enc := json.NewEncoder(b)
    r := NewRegistry()
    r.Register("counter", NewCounter())
    enc.Encode(r)
    if s := b.String(); "{\"counter\":{\"count\":0}}\n" != s {
        t.Fatalf(s)
    }
}

func TestRegistryWriteJSONOnce(t *testing.T) {
    r := NewRegistry()
    r.Register("counter", NewCounter())
    b := &bytes.Buffer{}
    WriteJSONOnce(r, b)
    if s := b.String(); s != "{\"counter\":{\"count\":0}}\n" {
        t.Fail()
    }
}