Mastering TypeScript 3 - Third Edition

Complex model tests

We can use the same techniques to test that complex models are instantiated correctly. Consider the following test suite:

describe("model.spec.ts : ItemCollectionViewModel tests", () => { 
    let itemCollectionViewModel: ItemCollectionViewModel; 
    beforeEach(() => { 
        itemCollectionViewModel = new ItemCollectionViewModel({ 
            Title: "testTitle", 
            SelectedItem: { 
                Id: 10, 
                DisplayName: "testDisplayName" 
            }, 
            Name: "testName" 
        }); 
    }); 

Here, we are creating an instance of our complex model, named itemCollectionViewModel. The interesting bit is the construction of this complex model with a POJO. We are calling the constructor in our beforeEach function, and simply nesting POJOs within each other. We are setting the Title property, and then ...