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package export // import "collectd.org/export"
import (
"context"
"errors"
"expvar"
"sync"
"testing"
"time"
"collectd.org/api"
"github.com/google/go-cmp/cmp"
"github.com/google/go-cmp/cmp/cmpopts"
)
func TestDerive(t *testing.T) {
// clean up shared resource after testing
defer func() {
vars = nil
}()
d := NewDeriveString("example.com/TestDerive/derive")
for i := 0; i < 10; i++ {
d.Add(i)
}
want := &api.ValueList{
Identifier: api.Identifier{
Host: "example.com",
Plugin: "TestDerive",
Type: "derive",
},
Values: []api.Value{api.Derive(45)},
}
got := d.ValueList()
if diff := cmp.Diff(want, got); diff != "" {
t.Errorf("Derive.ValueList() differs (+got/-want):\n%s", diff)
}
s := expvar.Get("example.com/TestDerive/derive").String()
if s != "45" {
t.Errorf("got %q, want %q", s, "45")
}
}
func TestGauge(t *testing.T) {
// clean up shared resource after testing
defer func() {
vars = nil
}()
g := NewGaugeString("example.com/TestGauge/gauge")
g.Set(42.0)
want := &api.ValueList{
Identifier: api.Identifier{
Host: "example.com",
Plugin: "TestGauge",
Type: "gauge",
},
Values: []api.Value{api.Gauge(42)},
}
got := g.ValueList()
if diff := cmp.Diff(want, got); diff != "" {
t.Errorf("Gauge.ValueList() differs (+got/-want):\n%s", diff)
}
s := expvar.Get("example.com/TestGauge/gauge").String()
if s != "42" {
t.Errorf("got %q, want %q", s, "42")
}
}
type testWriter struct {
got []*api.ValueList
done chan<- struct{}
once *sync.Once
}
func (w *testWriter) Write(ctx context.Context, vl *api.ValueList) error {
w.got = append(w.got, vl)
w.once.Do(func() {
close(w.done)
})
return nil
}
func TestRun(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
// clean up shared resource after testing
defer func() {
vars = nil
}()
d := NewDeriveString("example.com/TestRun/derive")
d.Add(23)
g := NewGaugeString("example.com/TestRun/gauge")
g.Set(42)
var (
done = make(chan struct{})
once sync.Once
)
w := testWriter{
done: done,
once: &once,
}
go func() {
// when one metric has been written, cancel the context
<-done
cancel()
}()
err := Run(ctx, &w, Options{Interval: 100 * time.Millisecond})
if !errors.Is(err, context.Canceled) {
t.Errorf("Run() = %v, want %v", err, context.Canceled)
}
want := []*api.ValueList{
{
Identifier: api.Identifier{
Host: "example.com",
Plugin: "TestRun",
Type: "gauge",
},
Time: time.Now(),
Interval: 100 * time.Millisecond,
Values: []api.Value{api.Gauge(42)},
},
{
Identifier: api.Identifier{
Host: "example.com",
Plugin: "TestRun",
Type: "derive",
},
Time: time.Now(),
Interval: 100 * time.Millisecond,
Values: []api.Value{api.Derive(23)},
},
}
ignoreOrder := cmpopts.SortSlices(func(a, b *api.ValueList) bool {
return a.Identifier.String() < b.Identifier.String()
})
approximateTime := cmp.Comparer(func(t0, t1 time.Time) bool {
diff := t0.Sub(t1)
if t1.After(t0) {
diff = t1.Sub(t0)
}
return diff < 2*time.Second
})
if diff := cmp.Diff(want, w.got, ignoreOrder, approximateTime); diff != "" {
t.Errorf("received value lists differ (+got/-want):\n%s", diff)
}
}
|
