1 files changed, 58 insertions, 0 deletions
diff --git a/vendor/github.com/prometheus/client_golang/prometheus/counter_test.go b/vendor/github.com/prometheus/client_golang/prometheus/counter_test.go
new file mode 100644
index 000000000..67391a23a
--- /dev/null
+++ b/vendor/github.com/prometheus/client_golang/prometheus/counter_test.go
@@ -0,0 +1,58 @@
+// Copyright 2014 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 (
+	"math"
+	"testing"
+
+	dto "github.com/prometheus/client_model/go"
+)
+
+func TestCounterAdd(t *testing.T) {
+	counter := NewCounter(CounterOpts{
+		Name:        "test",
+		Help:        "test help",
+		ConstLabels: Labels{"a": "1", "b": "2"},
+	}).(*counter)
+	counter.Inc()
+	if expected, got := 1., math.Float64frombits(counter.valBits); expected != got {
+		t.Errorf("Expected %f, got %f.", expected, got)
+	}
+	counter.Add(42)
+	if expected, got := 43., math.Float64frombits(counter.valBits); expected != got {
+		t.Errorf("Expected %f, got %f.", expected, got)
+	}
+
+	if expected, got := "counter cannot decrease in value", decreaseCounter(counter).Error(); expected != got {
+		t.Errorf("Expected error %q, got %q.", expected, got)
+	}
+
+	m := &dto.Metric{}
+	counter.Write(m)
+
+	if expected, got := `label:<name:"a" value:"1" > label:<name:"b" value:"2" > counter:<value:43 > `, m.String(); expected != got {
+		t.Errorf("expected %q, got %q", expected, got)
+	}
+}
+
+func decreaseCounter(c *counter) (err error) {
+	defer func() {
+		if e := recover(); e != nil {
+			err = e.(error)
+		}
+	}()
+	c.Add(-1)
+	return nil
+}