Add replset_config_collector_test.

Author: hiroshi

exporter/replset_config_collector_test.go

@@ -0,0 +1,80 @@
+// mongodb_exporter
+// Copyright (C) 2017 Percona LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+package exporter
+
+import (
+	"context"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus/testutil"
+	"github.com/sirupsen/logrus"
+	"github.com/stretchr/testify/assert"
+
+	"github.com/percona/mongodb_exporter/internal/tu"
+)
+
+func TestReplsetConfigCollector(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+
+	client := tu.DefaultTestClient(ctx, t)
+
+	ti := labelsGetterMock{}
+
+	c := &replSetGetConfigCollector{
+		ctx:          ctx,
+		client:       client,
+		logger:       logrus.New(),
+		topologyInfo: ti,
+	}
+
+	// The last \n at the end of this string is important
+	expected := strings.NewReader(`
+# HELP mongodb_cfg_protocolVersion cfg.
+# TYPE mongodb_cfg_protocolVersion untyped
+mongodb_cfg_protocolVersion 1` + "\n")
+	// Filter metrics for 2 reasons:
+	// 1. The result is huge
+	// 2. We need to check against know values. Don't use metrics that return counters like uptime
+	//    or counters like the number of transactions because they won't return a known value to compare
+	filter := []string{
+		"mongodb_cfg_protocolVersion",
+	}
+	err := testutil.CollectAndCompare(c, expected, filter...)
+	assert.NoError(t, err)
+}
+
+func TestReplsetConfigCollectorNoSharding(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+
+	client := tu.TestClient(ctx, tu.MongoDBStandAlonePort, t)
+
+	ti := labelsGetterMock{}
+
+	c := &replSetGetConfigCollector{
+		ctx:          ctx,
+		client:       client,
+		topologyInfo: ti,
+	}
+
+	expected := strings.NewReader(``)
+	err := testutil.CollectAndCompare(c, expected)
+	assert.NoError(t, err)
+}