优化结构

internal/biz/system/user_test.go

@@ -12,6 +12,16 @@ type defaultRouterUserRepo struct {
 	err     error
 }
 
+type loginUserRepo struct {
+	UserRepo
+	user *User
+	err  error
+}
+
+func (r *loginUserRepo) FindUserByUsername(context.Context, string) (*User, error) {
+	return r.user, r.err
+}
+
 func (r *defaultRouterUserRepo) HasAuthorityMenu(context.Context, uint, string) (bool, error) {
 	return r.hasMenu, r.err
 }
@@ -35,3 +45,10 @@ func TestFallbackDefaultRouterMatchesMenuLookupOutcome(t *testing.T) {
 		t.Fatalf("empty missing default route = %q", user.Authority.DefaultRouter)
 	}
 }
+
+func TestLoginRejectsMissingUserWithoutPanic(t *testing.T) {
+	user, err := NewUserUsecase(&loginUserRepo{}).Login(context.Background(), "missing", "password")
+	if !errors.Is(err, ErrInvalidCredentials) || user != nil {
+		t.Fatalf("Login() = %#v, %v; want nil, ErrInvalidCredentials", user, err)
+	}
+}