refactor: split tenant and lease page modules

frontend/src/app/components/lease-form/lease-form.spec.ts

@@ -0,0 +1,42 @@
+import { TestBed } from '@angular/core/testing';
+import { provideNativeDateAdapter } from '@angular/material/core';
+import { LeaseForm } from './lease-form';
+
+describe('LeaseForm', () => {
+  it('serializes selected dates as ISO values', () => {
+    TestBed.configureTestingModule({ providers: [provideNativeDateAdapter()] });
+    const fixture = TestBed.createComponent(LeaseForm);
+    fixture.componentRef.setInput('apartments', []);
+    fixture.componentRef.setInput('tenants', []);
+    const component = fixture.componentInstance;
+    component.apartmentId.set('apartment-1');
+    component.tenantIds.set(['tenant-1']);
+    component.startDate.set(new Date(2026, 8, 1));
+    component.endDate.set(new Date(2027, 7, 31));
+    component.monthlyRent.set(850);
+    component.monthlyCharges.set(50);
+    component.securityDeposit.set(850);
+    let startDate = '';
+    component.submitted.subscribe((lease) => (startDate = lease.startDate));
+
+    component.save({ invalid: false } as never);
+
+    expect(startDate).toBe('2026-09-01');
+  });
+
+  it('keeps guarantors in the lease form module', () => {
+    TestBed.configureTestingModule({ providers: [provideNativeDateAdapter()] });
+    const fixture = TestBed.createComponent(LeaseForm);
+    fixture.componentRef.setInput('apartments', []);
+    fixture.componentRef.setInput('tenants', []);
+    fixture.componentInstance.addGuarantor({
+      firstName: 'Alex',
+      lastName: 'Durand',
+      email: 'alex@example.com',
+      phone: '',
+      address: '',
+    });
+
+    expect(fixture.componentInstance.guarantors()).toHaveLength(1);
+  });
+});