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// Copyright 2025 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package prometheus
import "testing"
func TestCollectorFunc(t *testing.T) {
testDesc := NewDesc(
"test_metric",
"A test metric",
nil, nil,
)
cf := CollectorFunc(func(ch chan<- Metric) {
ch <- MustNewConstMetric(
testDesc,
GaugeValue,
42.0,
)
})
ch := make(chan Metric, 1)
cf.Collect(ch)
close(ch)
metric := <-ch
if metric == nil {
t.Fatal("Expected metric, got nil")
}
descCh := make(chan *Desc, 1)
cf.Describe(descCh)
close(descCh)
desc := <-descCh
if desc == nil {
t.Fatal("Expected desc, got nil")
}
if desc.String() != testDesc.String() {
t.Fatalf("Expected %s, got %s", testDesc.String(), desc.String())
}
}
func TestCollectorFuncWithRegistry(t *testing.T) {
reg := NewPedanticRegistry()
cf := CollectorFunc(func(ch chan<- Metric) {
ch <- MustNewConstMetric(
NewDesc(
"test_metric",
"A test metric",
nil, nil,
),
GaugeValue,
42.0,
)
})
if err := reg.Register(cf); err != nil {
t.Errorf("Failed to register CollectorFunc: %v", err)
}
collectedMetrics, err := reg.Gather()
if err != nil {
t.Errorf("Failed to gather metrics: %v", err)
}
if len(collectedMetrics) != 1 {
t.Errorf("Expected 1 metric family, got %d", len(collectedMetrics))
}
}
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