probe: add test case for redirect terminating cases

pkg/probe/http/http.go

@@ -129,11 +129,7 @@ func DoHTTPProbe(url *url.URL, headers http.Header, client GetHTTPInterface) (pr
 	if res.StatusCode >= http.StatusOK && res.StatusCode < http.StatusBadRequest {
 		if res.StatusCode >= http.StatusMultipleChoices { // Redirect
 			klog.V(4).Infof("Probe terminated redirects for %s, Response: %v", url.String(), *res)
-			// add some message in case body is empty when redirect is terminated
-			if len(body) == 0 {
-				return probe.Warning, "Probe terminated redirects", nil
-			}
-			return probe.Warning, body, nil
+			return probe.Warning, fmt.Sprintf("Probe terminated redirects, Response body: %v", body), nil
 		}
 		klog.V(4).Infof("Probe succeeded for %s, Response: %v", url.String(), *res)
 		return probe.Success, body, nil

pkg/probe/http/http_test.go

@@ -139,6 +139,17 @@ func TestHTTPProbeChecker(t *testing.T) {
 		}
 	}
 
+	redirectHandlerWithBody := func(s int, body string) func(w http.ResponseWriter, r *http.Request) {
+		return func(w http.ResponseWriter, r *http.Request) {
+			if r.URL.Path == "/" {
+				http.Redirect(w, r, "/new", s)
+			} else if r.URL.Path == "/new" {
+				w.WriteHeader(s)
+				w.Write([]byte(body))
+			}
+		}
+	}
+
 	followNonLocalRedirects := true
 	prober := New(followNonLocalRedirects)
 	testCases := []struct {
@@ -336,6 +347,16 @@ func TestHTTPProbeChecker(t *testing.T) {
 			handler: redirectHandler(http.StatusPermanentRedirect, true), // 308
 			health:  probe.Failure,
 		},
+		{
+			handler: redirectHandlerWithBody(http.StatusPermanentRedirect, ""), // redirect with empty body
+			health:  probe.Warning,
+			accBody: "Probe terminated redirects, Response body:",
+		},
+		{
+			handler: redirectHandlerWithBody(http.StatusPermanentRedirect, "ok body"), // redirect with body
+			health:  probe.Warning,
+			accBody: "Probe terminated redirects, Response body: ok body",
+		},
 	}
 	for i, test := range testCases {
 		t.Run(fmt.Sprintf("case-%2d", i), func(t *testing.T) {