Implement TextInputFieldComponent spec

src/app/text-input-field/text-input-field.component.spec.ts

@@ -1,25 +1,110 @@
-import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import {async, ComponentFixture, TestBed} from '@angular/core/testing';
 
-import { TextInputFieldComponent } from './text-input-field.component';
+import {TextInputFieldComponent} from './text-input-field.component';
+import {Step} from '../step';
+import {Component, ViewChild} from '@angular/core';
+import {FormsModule} from '@angular/forms';
+import {InputComponentManagerService} from '../input-component-manager.service';
+import createSpyObj = jasmine.createSpyObj;
+
+@Component({
+  template: '<app-text-input-field [step]="step"></app-text-input-field>'
+})
+class TestHostComponent {
+  public step: Step = new Step(42);
+  @ViewChild(TextInputFieldComponent)
+  public sutComponent: TextInputFieldComponent;
+}
 
 describe('TextInputFieldComponent', () => {
-  let component: TextInputFieldComponent;
-  let fixture: ComponentFixture<TextInputFieldComponent>;
+  let testHostComponent: TestHostComponent;
+  let testHostFixture: ComponentFixture<TestHostComponent>;
+
+  const inputComponentManagerServiceStub = createSpyObj(['getNext']);
+  inputComponentManagerServiceStub.getNext.and.returnValue(undefined);
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
-      declarations: [ TextInputFieldComponent ]
+      declarations: [
+        TestHostComponent,
+        TextInputFieldComponent
+      ],
+      imports: [FormsModule],
+      providers: [{provide: InputComponentManagerService, useValue: inputComponentManagerServiceStub}]
     })
-    .compileComponents();
+      .compileComponents();
   }));
 
   beforeEach(() => {
-    fixture = TestBed.createComponent(TextInputFieldComponent);
-    component = fixture.componentInstance;
-    fixture.detectChanges();
+    testHostFixture = TestBed.createComponent(TestHostComponent);
+    testHostComponent = testHostFixture.componentInstance;
+    testHostFixture.detectChanges();
   });
 
   it('should create', () => {
-    expect(component).toBeTruthy();
+    expect(testHostComponent.sutComponent).toBeTruthy();
+  });
+
+  it('should not perform an update if no converter is selected', () => {
+    // arrange
+    const step: Step = testHostComponent.step;
+    step.content = 'Don\'t you change me!';
+    step.error = false;
+    step.message = 'There be no message.';
+
+    // act
+    testHostComponent.sutComponent.update(step);
+
+    // assert
+    expect(step.content).toEqual('Don\'t you change me!');
+    expect(step.error).toBeFalsy();
+    expect(step.message).toEqual('There be no message.');
+  });
+
+  it('should set the error flag if the conversion fails', () => {
+    // arrange
+    const step: Step = testHostComponent.step;
+    step.content = 'Don\'t you change me!';
+    step.error = false;
+    step.message = 'There be no message.';
+    step.selectedConverter = {
+      getId: () => 'testConverter',
+      convert: () => {
+        throw new Error('Test error');
+      },
+      getDisplayname: () => 'Testing converter'
+    };
+
+    // act
+    testHostComponent.sutComponent.update(step);
+
+    // assert
+    expect(step.content).toEqual('Don\'t you change me!');
+    expect(step.error).toBeTruthy();
+    expect(step.message).toEqual('Test error');
+  });
+
+  it('should correctly convert valid input', () => {
+    // arrange
+    const nextStep: Step = new Step(82);
+    inputComponentManagerServiceStub.getNext.and.returnValue(nextStep);
+    const step: Step = testHostComponent.step;
+    step.content = 'Don\'t you change me!';
+    step.error = true;
+    step.message = 'There be no message.';
+    step.selectedConverter = {
+      getId: () => 'testConverter',
+      convert: () => 'The Converted Result',
+      getDisplayname: () => 'Testing converter'
+    };
+
+    // act
+    testHostComponent.sutComponent.update(step);
+
+    // assert
+    expect(step.content).toEqual('Don\'t you change me!');
+    expect(step.error).toBeFalsy();
+    expect(step.message).toEqual('');
+    expect(nextStep.content).toEqual('The Converted Result');
   });
 });