add ut for audit useragent

staging/src/k8s.io/apiserver/pkg/endpoints/audit_test.go

@@ -63,6 +63,7 @@ func TestAudit(t *testing.T) {
 		Other:      "bla",
 	}
 	simpleCPrimeJSON, _ := runtime.Encode(testCodec, simpleCPrime)
+	userAgent := "audit-test"
 
 	// event checks
 	noRequestBody := func(i int) eventCheck {
@@ -111,6 +112,16 @@ func TestAudit(t *testing.T) {
 			return nil
 		}
 	}
+	requestUserAgentMatches := func(userAgent string) eventCheck {
+		return func(events []*auditinternal.Event) error {
+			for i := range events {
+				if events[i].UserAgent != userAgent {
+					return fmt.Errorf("expected request user agent to match %q, but got: %q", userAgent, events[i].UserAgent)
+				}
+			}
+			return nil
+		}
+	}
 
 	for _, test := range []struct {
 		desc   string
@@ -295,6 +306,8 @@ func TestAudit(t *testing.T) {
 			t.Errorf("[%s] error creating the request: %v", test.desc, err)
 		}
 
+		req.Header.Set("User-Agent", userAgent)
+
 		response, err := client.Do(req)
 		if err != nil {
 			t.Errorf("[%s] error: %v", test.desc, err)
@@ -326,6 +339,10 @@ func TestAudit(t *testing.T) {
 					t.Errorf("[%s,%d] %v", test.desc, i, err)
 				}
 			}
+
+			if err := requestUserAgentMatches(userAgent)(events); err != nil {
+				t.Errorf("[%s] %v", test.desc, err)
+			}
 		}
 
 		if len(events) > 0 {