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https://github.com/prometheus-community/postgres_exporter
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4aa8cd4996
* Database wraparound collector and test --------- Signed-off-by: Felix Yuan <felix.yuan@reddit.com> Co-authored-by: Joe Adams <github@joeadams.io>
65 lines
2.0 KiB
Go
65 lines
2.0 KiB
Go
// Copyright 2023 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package collector
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import (
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"context"
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"testing"
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"github.com/DATA-DOG/go-sqlmock"
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"github.com/prometheus/client_golang/prometheus"
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dto "github.com/prometheus/client_model/go"
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"github.com/smartystreets/goconvey/convey"
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)
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func TestPGDatabaseWraparoundCollector(t *testing.T) {
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db, mock, err := sqlmock.New()
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if err != nil {
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t.Fatalf("Error opening a stub db connection: %s", err)
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}
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defer db.Close()
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inst := &instance{db: db}
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columns := []string{
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"datname",
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"age_datfrozenxid",
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"age_datminmxid",
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}
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rows := sqlmock.NewRows(columns).
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AddRow("newreddit", 87126426, 0)
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mock.ExpectQuery(sanitizeQuery(databaseWraparoundQuery)).WillReturnRows(rows)
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ch := make(chan prometheus.Metric)
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go func() {
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defer close(ch)
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c := PGDatabaseWraparoundCollector{}
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if err := c.Update(context.Background(), inst, ch); err != nil {
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t.Errorf("Error calling PGDatabaseWraparoundCollector.Update: %s", err)
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}
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}()
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expected := []MetricResult{
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{labels: labelMap{"datname": "newreddit"}, value: 87126426, metricType: dto.MetricType_GAUGE},
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{labels: labelMap{"datname": "newreddit"}, value: 0, metricType: dto.MetricType_GAUGE},
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}
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convey.Convey("Metrics comparison", t, func() {
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for _, expect := range expected {
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m := readMetric(<-ch)
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convey.So(expect, convey.ShouldResemble, m)
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}
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})
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if err := mock.ExpectationsWereMet(); err != nil {
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t.Errorf("there were unfulfilled exceptions: %s", err)
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}
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}
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