56 lines
1.3 KiB
Go
56 lines
1.3 KiB
Go
package racer
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import (
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"net/http"
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"net/http/httptest"
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"testing"
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"time"
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)
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type SpyRacerTimeout struct{}
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func (s *SpyRacerTimeout) Timeout() <-chan time.Time {
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return time.After(1 * time.Millisecond)
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}
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func TestRacer(t *testing.T) {
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t.Run("compares speeds of servers, returning the url of the fasted one", func(t *testing.T) {
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slowServer := makeDelayedServer(20 * time.Millisecond)
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defer slowServer.Close()
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fastServer := makeDelayedServer(0 * time.Millisecond)
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defer fastServer.Close()
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slowURL := slowServer.URL
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fastURL := fastServer.URL
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want := fastURL
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got, _ := Racer(slowURL, fastURL)
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if got != want {
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t.Errorf("got %q, want %q", got, want)
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}
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})
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t.Run("returns an error if a server doesn't respond within 10s", func(t *testing.T) {
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serverA := makeDelayedServer(25 * time.Millisecond)
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defer serverA.Close()
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serverB := makeDelayedServer(25 * time.Millisecond)
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defer serverB.Close()
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_, err := ConfigurableRacer(serverA.URL, serverB.URL, 20*time.Millisecond)
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if err == nil {
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t.Error("expected an error but didn't got one")
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}
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})
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}
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func makeDelayedServer(delay time.Duration) *httptest.Server {
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return httptest.NewServer(http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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time.Sleep(delay)
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w.WriteHeader(http.StatusOK)
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}))
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}
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