pangolin_exporter
103 строки · 3.2 Кб
1// Copyright 2023 The Prometheus Authors
2// Licensed under the Apache License, Version 2.0 (the "License");
3// you may not use this file except in compliance with the License.
4// You may obtain a copy of the License at
5//
6// http://www.apache.org/licenses/LICENSE-2.0
7//
8// Unless required by applicable law or agreed to in writing, software
9// distributed under the License is distributed on an "AS IS" BASIS,
10// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11// See the License for the specific language governing permissions and
12// limitations under the License.
13package collector
14
15import (
16"context"
17"testing"
18
19"github.com/DATA-DOG/go-sqlmock"
20"github.com/prometheus/client_golang/prometheus"
21dto "github.com/prometheus/client_model/go"
22"github.com/smartystreets/goconvey/convey"
23)
24
25func TestPGDatabaseCollector(t *testing.T) {
26db, mock, err := sqlmock.New()
27if err != nil {
28t.Fatalf("Error opening a stub db connection: %s", err)
29}
30defer db.Close()
31
32inst := &instance{db: db}
33
34mock.ExpectQuery(sanitizeQuery(pgDatabaseQuery)).WillReturnRows(sqlmock.NewRows([]string{"datname", "datconnlimit"}).
35AddRow("postgres", 15))
36
37mock.ExpectQuery(sanitizeQuery(pgDatabaseSizeQuery)).WithArgs("postgres").WillReturnRows(sqlmock.NewRows([]string{"pg_database_size"}).
38AddRow(1024))
39
40ch := make(chan prometheus.Metric)
41go func() {
42defer close(ch)
43c := PGDatabaseCollector{}
44if err := c.Update(context.Background(), inst, ch); err != nil {
45t.Errorf("Error calling PGDatabaseCollector.Update: %s", err)
46}
47}()
48
49expected := []MetricResult{
50{labels: labelMap{"datname": "postgres"}, value: 15, metricType: dto.MetricType_GAUGE},
51{labels: labelMap{"datname": "postgres"}, value: 1024, metricType: dto.MetricType_GAUGE},
52}
53convey.Convey("Metrics comparison", t, func() {
54for _, expect := range expected {
55m := readMetric(<-ch)
56convey.So(expect, convey.ShouldResemble, m)
57}
58})
59if err := mock.ExpectationsWereMet(); err != nil {
60t.Errorf("there were unfulfilled exceptions: %s", err)
61}
62}
63
64// TODO add a null db test
65
66func TestPGDatabaseCollectorNullMetric(t *testing.T) {
67db, mock, err := sqlmock.New()
68if err != nil {
69t.Fatalf("Error opening a stub db connection: %s", err)
70}
71defer db.Close()
72
73inst := &instance{db: db}
74
75mock.ExpectQuery(sanitizeQuery(pgDatabaseQuery)).WillReturnRows(sqlmock.NewRows([]string{"datname", "datconnlimit"}).
76AddRow("postgres", nil))
77
78mock.ExpectQuery(sanitizeQuery(pgDatabaseSizeQuery)).WithArgs("postgres").WillReturnRows(sqlmock.NewRows([]string{"pg_database_size"}).
79AddRow(nil))
80
81ch := make(chan prometheus.Metric)
82go func() {
83defer close(ch)
84c := PGDatabaseCollector{}
85if err := c.Update(context.Background(), inst, ch); err != nil {
86t.Errorf("Error calling PGDatabaseCollector.Update: %s", err)
87}
88}()
89
90expected := []MetricResult{
91{labels: labelMap{"datname": "postgres"}, value: 0, metricType: dto.MetricType_GAUGE},
92{labels: labelMap{"datname": "postgres"}, value: 0, metricType: dto.MetricType_GAUGE},
93}
94convey.Convey("Metrics comparison", t, func() {
95for _, expect := range expected {
96m := readMetric(<-ch)
97convey.So(expect, convey.ShouldResemble, m)
98}
99})
100if err := mock.ExpectationsWereMet(); err != nil {
101t.Errorf("there were unfulfilled exceptions: %s", err)
102}
103}
104