Chore: Updated resolvers from Class to ResolveFn

overlord/src/app/period/period.resolver.spec.ts

@@ -0,0 +1,18 @@
+import { TestBed } from '@angular/core/testing';
+import { ResolveFn } from '@angular/router';
+
+import { Period } from './period';
+import { periodResolver } from './period.resolver';
+
+describe('periodResolver', () => {
+  const executeResolver: ResolveFn<Period> = (...resolverParameters) =>
+    TestBed.runInInjectionContext(() => periodResolver(...resolverParameters));
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+  });
+
+  it('should be created', () => {
+    expect(executeResolver).toBeTruthy();
+  });
+});