src/app/converter-registry.service.spec.ts

@@ -1,15 +1,40 @@
-import { TestBed, inject } from '@angular/core/testing';
+import {inject, TestBed} from '@angular/core/testing';
 
 import {ConverterRegistryService} from './converter-registry.service';
+import {NativeLibraryWrapperService} from './native-library-wrapper.service';
+import {Converter} from './converter/converter';
+import {Base64Decoder} from './converter/base64-decoder';
+import createSpyObj = jasmine.createSpyObj;
 
 describe('ConverterRegistryService', () => {
   beforeEach(() => {
     TestBed.configureTestingModule({
-      providers: [ConverterRegistryService]
+      providers: [
+        ConverterRegistryService,
+        {provide: NativeLibraryWrapperService, useValue: createSpyObj(['punycode', 'quotedPrintable', 'utf8'])}
+      ]
     });
   });
 
   it('should be created', inject([ConverterRegistryService], (service: ConverterRegistryService) => {
     expect(service).toBeTruthy();
   }));
+
+  it('should register converters upon creation', inject([ConverterRegistryService], (service: ConverterRegistryService) => {
+    expect(service.getAllConverters()).toBeTruthy();
+    expect(service.getAllConverters().length).toBeGreaterThan(0);
+  }));
+
+  it('must not allow the same converter ID to be regisgered more than once',
+    inject([ConverterRegistryService], (service: ConverterRegistryService) => {
+      // arrange
+      const duplicateConverter: Converter = new Base64Decoder();
+      const duplicateConverterId = duplicateConverter.getId();
+      expect(() => {
+        // act
+        (service as any).registerConverter(duplicateConverter);
+      })
+      // assert
+        .toThrowError(`Converter-ID ${duplicateConverterId} is already registered!`);
+    }));
 });

src/app/input-component-manager.service.spec.ts

@@ -1,6 +1,7 @@
-import { TestBed, inject } from '@angular/core/testing';
+import {inject, TestBed} from '@angular/core/testing';
 
 import {InputComponentManagerService} from './input-component-manager.service';
+import {Step} from './step';
 
 describe('InputComponentManagerService', () => {
   beforeEach(() => {
@@ -12,4 +13,59 @@ describe('InputComponentManagerService', () => {
   it('should be created', inject([InputComponentManagerService], (service: InputComponentManagerService) => {
     expect(service).toBeTruthy();
   }));
+
+  it('should create a component if requesting the first one',
+    inject([InputComponentManagerService], (service: InputComponentManagerService) => {
+      const firstStep: Step = service.getFirst();
+      expect(firstStep).toBeTruthy();
+      expect(service.getFirst()).toBe(firstStep);
+      expect(service.getAllComponents().length).toEqual(1);
+    })
+  );
+
+  it('must not add a null Step', inject([InputComponentManagerService], (service: InputComponentManagerService) => {
+    expect(() => service.register(null)).toThrowError();
+    expect(service.getAllComponents().length).toEqual(0);
+  }));
+
+  it('must not add an undefined Step', inject([InputComponentManagerService], (service: InputComponentManagerService) => {
+    expect(() => service.register(undefined)).toThrowError();
+    expect(service.getAllComponents().length).toEqual(0);
+  }));
+
+  it('should register new Steps', inject([InputComponentManagerService], (service: InputComponentManagerService) => {
+    service.register(new Step(99));
+    expect(service.getAllComponents().length).toEqual(1);
+    service.register(new Step(100));
+    expect(service.getAllComponents().length).toEqual(2);
+  }));
+
+  it('should return a new step if the next step doesn\'t exist',
+    inject([InputComponentManagerService], (service: InputComponentManagerService) => {
+      // arrange
+      const firstStep: Step = new Step(0);
+      service.register(firstStep);
+
+      // act
+      const nextStep: Step = service.getNext(firstStep);
+
+      // assert
+      expect(service.getAllComponents().length).toEqual(2);
+      expect(nextStep.index).toEqual(1);
+    })
+  );
+
+  it('should return the next step if requested', inject([InputComponentManagerService], (service: InputComponentManagerService) => {
+    // arrange
+    const firstStep: Step = new Step(0);
+    const nextStep: Step = new Step(1);
+    service.register(firstStep);
+    service.register(nextStep);
+
+    // act
+    const requestedStep: Step = service.getNext(firstStep);
+    // assert
+    expect(service.getAllComponents().length).toEqual(2);
+    expect(requestedStep).toEqual(nextStep);
+  }));
 });

src/app/input-component-manager.service.ts

@@ -11,6 +11,9 @@ export class InputComponentManagerService {
   }
 
   public register(component: Step): void {
+    if (!component) {
+      throw new Error('component to add must not be empty or undefined');
+    }
     this.components.push(component);
   }
 

src/app/native-library-wrapper.service.spec.ts

@@ -1,4 +1,4 @@
-import { TestBed, inject } from '@angular/core/testing';
+import {inject, TestBed} from '@angular/core/testing';
 
 import {NativeLibraryWrapperService} from './native-library-wrapper.service';
 
@@ -12,4 +12,22 @@ describe('NativeLibraryWrapperService', () => {
   it('should be created', inject([NativeLibraryWrapperService], (service: NativeLibraryWrapperService) => {
     expect(service).toBeTruthy();
   }));
+
+  it('should convert punycode', inject([NativeLibraryWrapperService], (service: NativeLibraryWrapperService) => {
+    expect(service.punycode).toBeTruthy();
+    expect(service.punycode.encode('bärneruhr')).toEqual('brneruhr-0za');
+    expect(service.punycode.decode('brneruhr-0za')).toEqual('bärneruhr');
+  }));
+
+  it('should convert utf8', inject([NativeLibraryWrapperService], (service: NativeLibraryWrapperService) => {
+    expect(service.utf8).toBeTruthy();
+    expect(service.utf8.encode('bärneruhr')).toEqual('bärneruhr');
+    expect(service.utf8.decode('bärneruhr')).toEqual('bärneruhr');
+  }));
+
+  it('should convert quoted printable', inject([NativeLibraryWrapperService], (service: NativeLibraryWrapperService) => {
+    expect(service.quotedPrintable).toBeTruthy();
+    expect(service.quotedPrintable.encode('bärneruhr')).toEqual('b=E4rneruhr');
+    expect(service.quotedPrintable.decode('b=E4rneruhr')).toEqual('bärneruhr');
+  }));
 });

src/app/native-library-wrapper.service.ts

@@ -7,9 +7,9 @@ import * as NativeUtf8 from 'utf8';
   providedIn: 'root'
 })
 export class NativeLibraryWrapperService {
-  public utf8: Utf8;
-  public quotedPrintable: QuotedPrintable;
-  public punycode: Punycode;
+  public readonly utf8: Utf8;
+  public readonly quotedPrintable: QuotedPrintable;
+  public readonly punycode: Punycode;
 
   constructor() {
     this.utf8 = NativeUtf8;