角度测试台覆盖模块不工作

当对测试夹具使用以下配置时，我收到关于找不到标签的抱怨。替换为MockSelectionToolComponent直接在AppModule工作正常，所以一定是别的东西......

 // Add the imported module to the imports array in beforeEach
    beforeEach(() => {
        TestBed.configureTestingModule({
            declarations: [MockSelectionToolComponent],
            imports: [

                AppModule
            ]
        }).overrideModule(AppModule, {
            remove: {
                declarations: [SelectionToolComponent]
            }
        }).compileComponents();

        fixture = TestBed.createComponent(MappingComponent);
        component = fixture.componentInstance;
        fixture.detectChanges();
        component.initialiseMap();
    });

错误：模板解析错误：“app-selection-tool”不是已知的 元素：

所以实际上我们没有将其添加到测试模块的声明中，而是添加到原始模块中：

// Add the imported module to the imports array in beforeEach
beforeEach(() => {
    TestBed.configureTestingModule({
        declarations: [],
        imports: [

            AppModule
        ]
    }).overrideModule(AppModule, {
        remove: {
                declarations: [SelectionToolComponent]
            },
        add: {
                declarations: [MockSelectionToolComponent]
        }
    }).compileComponents();

    fixture = TestBed.createComponent(MappingComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
    component.initialiseMap();
});

祝你好运，在任何地方都能找到记录。