101 lines
2.8 KiB
Go
101 lines
2.8 KiB
Go
package metrics
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import (
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"net/http"
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"net/http/httptest"
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"reflect"
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"testing"
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"github.com/go-kit/kit/metrics"
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"github.com/stretchr/testify/assert"
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)
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// CollectingCounter is a metrics.Counter implementation that enables access to the CounterValue and LastLabelValues.
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type CollectingCounter struct {
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CounterValue float64
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LastLabelValues []string
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}
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// With is there to satisfy the metrics.Counter interface.
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func (c *CollectingCounter) With(labelValues ...string) metrics.Counter {
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c.LastLabelValues = labelValues
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return c
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}
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// Add is there to satisfy the metrics.Counter interface.
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func (c *CollectingCounter) Add(delta float64) {
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c.CounterValue += delta
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}
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func TestMetricsRetryListener(t *testing.T) {
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req := httptest.NewRequest(http.MethodGet, "/", nil)
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retryMetrics := newCollectingRetryMetrics()
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retryListener := NewRetryListener(retryMetrics, "serviceName")
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retryListener.Retried(req, 1)
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retryListener.Retried(req, 2)
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wantCounterValue := float64(2)
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if retryMetrics.retriesCounter.CounterValue != wantCounterValue {
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t.Errorf("got counter value of %f, want %f", retryMetrics.retriesCounter.CounterValue, wantCounterValue)
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}
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wantLabelValues := []string{"service", "serviceName"}
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if !reflect.DeepEqual(retryMetrics.retriesCounter.LastLabelValues, wantLabelValues) {
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t.Errorf("wrong label values %v used, want %v", retryMetrics.retriesCounter.LastLabelValues, wantLabelValues)
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}
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}
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// collectingRetryMetrics is an implementation of the retryMetrics interface that can be used inside tests to collect the times Add() was called.
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type collectingRetryMetrics struct {
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retriesCounter *CollectingCounter
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}
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func newCollectingRetryMetrics() *collectingRetryMetrics {
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return &collectingRetryMetrics{retriesCounter: &CollectingCounter{}}
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}
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func (m *collectingRetryMetrics) ServiceRetriesCounter() metrics.Counter {
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return m.retriesCounter
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}
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type rwWithCloseNotify struct {
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*httptest.ResponseRecorder
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}
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func (r *rwWithCloseNotify) CloseNotify() <-chan bool {
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panic("implement me")
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}
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func TestCloseNotifier(t *testing.T) {
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testCases := []struct {
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rw http.ResponseWriter
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desc string
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implementsCloseNotifier bool
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}{
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{
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rw: httptest.NewRecorder(),
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desc: "does not implement CloseNotifier",
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implementsCloseNotifier: false,
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},
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{
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rw: &rwWithCloseNotify{httptest.NewRecorder()},
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desc: "implements CloseNotifier",
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implementsCloseNotifier: true,
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},
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}
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for _, test := range testCases {
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test := test
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t.Run(test.desc, func(t *testing.T) {
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t.Parallel()
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_, ok := test.rw.(http.CloseNotifier)
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assert.Equal(t, test.implementsCloseNotifier, ok)
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rw := newResponseRecorder(test.rw)
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_, impl := rw.(http.CloseNotifier)
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assert.Equal(t, test.implementsCloseNotifier, impl)
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})
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}
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}
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