Correct ConverterRegistryService.

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

@@ -0,0 +1,15 @@
+import { TestBed, inject } from '@angular/core/testing';
+
+import { ConverterRegistryService } from './converter-registry.service';
+
+describe('ConverterRegistryService', () => {
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [ConverterRegistryService]
+    });
+  });
+
+  it('should be created', inject([ConverterRegistryService], (service: ConverterRegistryService) => {
+    expect(service).toBeTruthy();
+  }));
+});