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metrics_test.go
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metrics_test.go
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package metrics_test
import (
"io/ioutil"
"net/http"
"net/http/httptest"
"testing"
"github.com/prometheus/client_golang/prometheus"
"github.com/stretchr/testify/assert"
"github.com/spotahome/redis-operator/metrics"
)
func TestPrometheusMetrics(t *testing.T) {
tests := []struct {
name string
addMetrics func(pm *metrics.PromMetrics)
expMetrics []string
expCode int
}{
{
name: "Setting OK should give an OK",
addMetrics: func(pm *metrics.PromMetrics) {
pm.SetClusterOK("testns", "test")
},
expMetrics: []string{
`my_metrics_controller_cluster_ok{name="test",namespace="testns"} 1`,
},
expCode: http.StatusOK,
},
{
name: "Setting Error should give an Error",
addMetrics: func(pm *metrics.PromMetrics) {
pm.SetClusterError("testns", "test")
},
expMetrics: []string{
`my_metrics_controller_cluster_ok{name="test",namespace="testns"} 0`,
},
expCode: http.StatusOK,
},
{
name: "Setting Error after ok should give an Error",
addMetrics: func(pm *metrics.PromMetrics) {
pm.SetClusterOK("testns", "test")
pm.SetClusterError("testns", "test")
},
expMetrics: []string{
`my_metrics_controller_cluster_ok{name="test",namespace="testns"} 0`,
},
expCode: http.StatusOK,
},
{
name: "Setting OK after Error should give an OK",
addMetrics: func(pm *metrics.PromMetrics) {
pm.SetClusterError("testns", "test")
pm.SetClusterOK("testns", "test")
},
expMetrics: []string{
`my_metrics_controller_cluster_ok{name="test",namespace="testns"} 1`,
},
expCode: http.StatusOK,
},
{
name: "Multiple clusters should appear",
addMetrics: func(pm *metrics.PromMetrics) {
pm.SetClusterOK("testns", "test")
pm.SetClusterOK("testns", "test2")
},
expMetrics: []string{
`my_metrics_controller_cluster_ok{name="test",namespace="testns"} 1`,
`my_metrics_controller_cluster_ok{name="test2",namespace="testns"} 1`,
},
expCode: http.StatusOK,
},
{
name: "Same name on different namespaces should appear",
addMetrics: func(pm *metrics.PromMetrics) {
pm.SetClusterOK("testns1", "test")
pm.SetClusterOK("testns2", "test")
},
expMetrics: []string{
`my_metrics_controller_cluster_ok{name="test",namespace="testns1"} 1`,
`my_metrics_controller_cluster_ok{name="test",namespace="testns2"} 1`,
},
expCode: http.StatusOK,
},
{
name: "Deleting a cluster should remove it",
addMetrics: func(pm *metrics.PromMetrics) {
pm.SetClusterOK("testns1", "test")
pm.DeleteCluster("testns1", "test")
},
expMetrics: []string{},
expCode: http.StatusOK,
},
{
name: "Deleting a cluster should remove only the desired one",
addMetrics: func(pm *metrics.PromMetrics) {
pm.SetClusterOK("testns1", "test")
pm.SetClusterOK("testns2", "test")
pm.DeleteCluster("testns1", "test")
},
expMetrics: []string{
`my_metrics_controller_cluster_ok{name="test",namespace="testns2"} 1`,
},
expCode: http.StatusOK,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
assert := assert.New(t)
path := "/awesome-metrics"
// Create the muxer for testing.
mx := http.NewServeMux()
reg := prometheus.NewRegistry()
pm := metrics.NewPrometheusMetrics(path, "my_metrics", mx, reg)
// Add metrics to prometheus.
test.addMetrics(pm)
// Make the request to the metrics.
req := httptest.NewRequest("GET", path, nil)
w := httptest.NewRecorder()
mx.ServeHTTP(w, req)
resp := w.Result()
if assert.Equal(test.expCode, resp.StatusCode) {
body, _ := ioutil.ReadAll(resp.Body)
// Check all the metrics are present.
for _, expMetric := range test.expMetrics {
assert.Contains(string(body), expMetric)
}
}
})
}
}