rename ngin to rest

rest/handler/breakerhandler_test.go

@@ -0,0 +1,102 @@
+package handler
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"zero/core/logx"
+	"zero/core/stat"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func init() {
+	logx.Disable()
+	stat.SetReporter(nil)
+}
+
+func TestBreakerHandlerAccept(t *testing.T) {
+	metrics := stat.NewMetrics("unit-test")
+	breakerHandler := BreakerHandler(http.MethodGet, "/", metrics)
+	handler := breakerHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("X-Test", "test")
+		_, err := w.Write([]byte("content"))
+		assert.Nil(t, err)
+	}))
+
+	req := httptest.NewRequest(http.MethodGet, "http://localhost", nil)
+	req.Header.Set("X-Test", "test")
+	resp := httptest.NewRecorder()
+	handler.ServeHTTP(resp, req)
+	assert.Equal(t, http.StatusOK, resp.Code)
+	assert.Equal(t, "test", resp.Header().Get("X-Test"))
+	assert.Equal(t, "content", resp.Body.String())
+}
+
+func TestBreakerHandlerFail(t *testing.T) {
+	metrics := stat.NewMetrics("unit-test")
+	breakerHandler := BreakerHandler(http.MethodGet, "/", metrics)
+	handler := breakerHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusBadGateway)
+	}))
+
+	req := httptest.NewRequest(http.MethodGet, "http://localhost", nil)
+	resp := httptest.NewRecorder()
+	handler.ServeHTTP(resp, req)
+	assert.Equal(t, http.StatusBadGateway, resp.Code)
+}
+
+func TestBreakerHandler_4XX(t *testing.T) {
+	metrics := stat.NewMetrics("unit-test")
+	breakerHandler := BreakerHandler(http.MethodGet, "/", metrics)
+	handler := breakerHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusBadRequest)
+	}))
+
+	for i := 0; i < 1000; i++ {
+		req := httptest.NewRequest(http.MethodGet, "http://localhost", nil)
+		resp := httptest.NewRecorder()
+		handler.ServeHTTP(resp, req)
+	}
+
+	const tries = 100
+	var pass int
+	for i := 0; i < tries; i++ {
+		req := httptest.NewRequest(http.MethodGet, "http://localhost", nil)
+		resp := httptest.NewRecorder()
+		handler.ServeHTTP(resp, req)
+		if resp.Code == http.StatusBadRequest {
+			pass++
+		}
+	}
+
+	assert.Equal(t, tries, pass)
+}
+
+func TestBreakerHandlerReject(t *testing.T) {
+	metrics := stat.NewMetrics("unit-test")
+	breakerHandler := BreakerHandler(http.MethodGet, "/", metrics)
+	handler := breakerHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusInternalServerError)
+	}))
+
+	for i := 0; i < 1000; i++ {
+		req := httptest.NewRequest(http.MethodGet, "http://localhost", nil)
+		resp := httptest.NewRecorder()
+		handler.ServeHTTP(resp, req)
+	}
+
+	var drops int
+	for i := 0; i < 100; i++ {
+		req := httptest.NewRequest(http.MethodGet, "http://localhost", nil)
+		resp := httptest.NewRecorder()
+		handler.ServeHTTP(resp, req)
+		if resp.Code == http.StatusServiceUnavailable {
+			drops++
+		}
+	}
+
+	assert.True(t, drops >= 80, fmt.Sprintf("expected to be greater than 80, but got %d", drops))
+}