Add test

collector/cpu_dragonfly_test.go

@@ -0,0 +1,41 @@
+// Copyright 2016 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.
+
+// +build !nocpu
+
+package collector
+
+import (
+	"runtime"
+	"testing"
+)
+
+func TestCPU(t *testing.T) {
+	var (
+		fieldsCount = 5
+		times, err  = getDragonFlyCPUTimes()
+	)
+
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	if len(times) == 0 {
+		t.Fatalf("no cputimes found")
+	}
+
+	want := runtime.NumCPU() * fieldsCount
+	if len(times) != want {
+		t.Fatalf("should have %d cpuTimes: got %d", want, len(times))
+	}
+}