diff --git a/grpc_test.go b/grpc_test.go
index 6c2de19..9d2df10 100644
--- a/grpc_test.go
+++ b/grpc_test.go
@@ -21,7 +21,7 @@ func TestUnaryInterceptorForwardsBearer(t *testing.T) {
 		t.Fatalf("Mint: %v", err)
 	}
 
-	var gotSubject string
+	var gotSubject, gotUsername string
 	var gotGroups []string
 	var gotRaw string
 	interceptor := auth.UnaryServerInterceptor()
@@ -32,6 +32,7 @@ func TestUnaryInterceptorForwardsBearer(t *testing.T) {
 			t.Fatal("missing caller")
 		}
 		gotSubject = c.Subject
+		gotUsername = c.Username
 		gotGroups = c.Groups
 		var okRaw bool
 		gotRaw, okRaw = BearerFromContext(ctx)
@@ -43,8 +44,8 @@ func TestUnaryInterceptorForwardsBearer(t *testing.T) {
 	if err != nil {
 		t.Fatalf("interceptor: %v", err)
 	}
-	if gotSubject != "konrad" || gotRaw != raw {
-		t.Fatalf("subject %q raw match %v", gotSubject, gotRaw == raw)
+	if gotSubject != "konrad" || gotUsername != "konrad" || gotRaw != raw {
+		t.Fatalf("subject %q username %q raw match %v", gotSubject, gotUsername, gotRaw == raw)
 	}
 	if len(gotGroups) != 2 || gotGroups[0] != "family" || gotGroups[1] != "mgmnt-admin" {
 		t.Fatalf("groups = %#v", gotGroups)