test(frontend): enhance AdminMembershipsComponent tests and fix deleteUserTariff compilation error

- Expand admin-memberships spec from 19 to 42 tests covering:
  approve/reject API calls, isProcessing guards, error handling,
  loading states, tab switching, card/table views, empty states
- Fix deleteUserTariff missing userId argument in user-tariff.ts
  (required after backend API change)

eeg_frontend/src/app/pages/admin-memberships/admin-memberships.spec.ts

@@ -57,27 +57,44 @@ describe('AdminMembershipsComponent', () => {
     httpMock.verify();
   });
 
-  it('should create', () => {
+  function flushPendingRequest(): void {
-    fixture.detectChanges();
     const req = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
     req.flush([]);
+  }
+
+  it('should create', () => {
+    fixture.detectChanges();
+    flushPendingRequest();
     expect(component).toBeTruthy();
   });
 
+  describe('initial state', () => {
     it('should default activeTab to pending', () => {
       fixture.detectChanges();
-    const req = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      flushPendingRequest();
-    req.flush([]);
       expect(component.activeTab()).toBe('pending');
     });
 
     it('should initialize allMemberships as empty array', () => {
       fixture.detectChanges();
-    const req = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      flushPendingRequest();
-    req.flush([]);
       expect(component.allMemberships()).toEqual([]);
     });
 
+    it('should initialize pendingMemberships as empty array', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+      expect(component.pendingMemberships()).toEqual([]);
+    });
+
+    it('should set isLoading to false after init completes', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+      expect(component.isLoading()).toBe(false);
+    });
+  });
+
+  describe('loadPendingMemberships', () => {
     it('should load pending memberships on init', () => {
       fixture.detectChanges();
       const req = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
@@ -87,10 +104,26 @@ describe('AdminMembershipsComponent', () => {
       expect(component.pendingMemberships()[0].firstName).toBe('Max');
     });
 
+    it('should set isLoading to true during loading and false after', () => {
+      fixture.detectChanges();
+      const req = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      expect(component.isLoading()).toBe(true);
+      req.flush([]);
+      expect(component.isLoading()).toBe(false);
+    });
+
+    it('should set isLoading to false on failure', () => {
+      fixture.detectChanges();
+      const req = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      req.flush('Error', { status: 500, statusText: 'Server Error' });
+      expect(component.isLoading()).toBe(false);
+    });
+  });
+
+  describe('loadAllMemberships', () => {
     it('should load all memberships when switching to active tab', () => {
       fixture.detectChanges();
-    const pendingReq = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      flushPendingRequest();
-    pendingReq.flush([]);
 
       component.switchTab('active');
 
@@ -105,24 +138,56 @@ describe('AdminMembershipsComponent', () => {
 
     it('should load all memberships when switching to all tab', () => {
       fixture.detectChanges();
-    const pendingReq = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      flushPendingRequest();
-    pendingReq.flush([]);
 
       component.switchTab('all');
 
       const allReq = httpMock.expectOne(
         (r) => r.url.includes('/admin/memberships') && !r.url.includes('/pending'),
       );
-    expect(allReq.request.method).toBe('GET');
       allReq.flush([mockPendingMembership, mockActiveMembership]);
 
       expect(component.allMemberships().length).toBe(2);
     });
 
+    it('should not reload if allMemberships already loaded', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.switchTab('active');
+      const firstReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships') && !r.url.includes('/pending'),
+      );
+      firstReq.flush([mockActiveMembership]);
+
+      component.switchTab('pending');
+      component.switchTab('active');
+
+      const additionalReqs = httpMock.match(
+        (r) => r.url.includes('/admin/memberships') && !r.url.includes('/pending'),
+      );
+      expect(additionalReqs.length).toBe(0);
+    });
+
+    it('should set isLoading to false after loading completes', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.switchTab('all');
+
+      const allReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships') && !r.url.includes('/pending'),
+      );
+      expect(component.isLoading()).toBe(true);
+      allReq.flush([]);
+      expect(component.isLoading()).toBe(false);
+    });
+  });
+
+  describe('switchTab', () => {
     it('should switch activeTab signal', () => {
       fixture.detectChanges();
-    const req = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      flushPendingRequest();
-    req.flush([]);
 
       component.switchTab('active');
       const activeReq = httpMock.expectOne(
@@ -142,6 +207,167 @@ describe('AdminMembershipsComponent', () => {
       expect(component.activeTab()).toBe('all');
     });
 
+    it('should only call API for all memberships once per load', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.switchTab('active');
+      const allReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships') && !r.url.includes('/pending'),
+      );
+      allReq.flush([mockActiveMembership]);
+      fixture.detectChanges();
+
+      component.switchTab('pending');
+      expect(component.activeTab()).toBe('pending');
+
+      component.switchTab('all');
+      expect(component.activeTab()).toBe('all');
+      const allReqs = httpMock.match(
+        (r) => r.url.includes('/admin/memberships') && !r.url.includes('/pending'),
+      );
+      expect(allReqs.length).toBe(0);
+    });
+  });
+
+  describe('approveMembership', () => {
+    it('should call approve API and reload pending memberships', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.approveMembership('1');
+
+      const approveReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships/1/approve'),
+      );
+      expect(approveReq.request.method).toBe('PUT');
+      approveReq.flush({});
+
+      const pendingReq = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      pendingReq.flush([]);
+    });
+
+    it('should set isProcessing while approving', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      expect(component.isProcessing()).toBeNull();
+      component.approveMembership('1');
+      expect(component.isProcessing()).toBe('1');
+
+      const approveReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships/1/approve'),
+      );
+      approveReq.flush({});
+
+      const pendingReq = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      pendingReq.flush([]);
+
+      expect(component.isProcessing()).toBeNull();
+    });
+
+    it('should not send approve request if already processing', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.approveMembership('1');
+      component.approveMembership('1');
+
+      const approveReqs = httpMock.match(
+        (r) => r.url.includes('/admin/memberships/1/approve'),
+      );
+      expect(approveReqs.length).toBe(1);
+
+      approveReqs[0].flush({});
+
+      const pendingReq = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      pendingReq.flush([]);
+    });
+
+    it('should reset isProcessing on error', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.approveMembership('1');
+
+      const approveReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships/1/approve'),
+      );
+      approveReq.flush({ message: 'Fehler' }, { status: 500, statusText: 'Server Error' });
+
+      expect(component.isProcessing()).toBeNull();
+    });
+  });
+
+  describe('rejectMembership', () => {
+    it('should call reject API and reload pending memberships', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.rejectMembership('1');
+
+      const rejectReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships/1/reject'),
+      );
+      expect(rejectReq.request.method).toBe('PUT');
+      rejectReq.flush({});
+
+      const pendingReq = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      pendingReq.flush([]);
+    });
+
+    it('should set isProcessing while rejecting', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      expect(component.isProcessing()).toBeNull();
+      component.rejectMembership('1');
+      expect(component.isProcessing()).toBe('1');
+
+      const rejectReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships/1/reject'),
+      );
+      rejectReq.flush({});
+
+      const pendingReq = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      pendingReq.flush([]);
+
+      expect(component.isProcessing()).toBeNull();
+    });
+
+    it('should not send reject request if already processing', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.rejectMembership('1');
+      component.rejectMembership('1');
+
+      const rejectReqs = httpMock.match(
+        (r) => r.url.includes('/admin/memberships/1/reject'),
+      );
+      expect(rejectReqs.length).toBe(1);
+
+      rejectReqs[0].flush({});
+
+      const pendingReq = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      pendingReq.flush([]);
+    });
+
+    it('should reset isProcessing on error', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.rejectMembership('1');
+
+      const rejectReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships/1/reject'),
+      );
+      rejectReq.flush({ message: 'Fehler' }, { status: 500, statusText: 'Server Error' });
+
+      expect(component.isProcessing()).toBeNull();
+    });
+  });
+
   describe('getStatusLabel', () => {
     it('should return "Ausstehend" for PENDING', () => {
       expect(component.getStatusLabel('PENDING')).toBe('Ausstehend');
@@ -177,8 +403,7 @@ describe('AdminMembershipsComponent', () => {
   describe('template', () => {
     it('should render three tabs', () => {
       fixture.detectChanges();
-      const req = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      flushPendingRequest();
-      req.flush([]);
       fixture.detectChanges();
 
       const tabs = fixture.nativeElement.querySelectorAll('[role="tab"]');
@@ -190,8 +415,7 @@ describe('AdminMembershipsComponent', () => {
 
     it('should show pending tab as active by default', () => {
       fixture.detectChanges();
-      const req = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      flushPendingRequest();
-      req.flush([]);
       fixture.detectChanges();
 
       const activeTab = fixture.nativeElement.querySelector('[role="tab"][aria-selected="true"]');
@@ -208,10 +432,30 @@ describe('AdminMembershipsComponent', () => {
       expect(cards.length).toBe(1);
     });
 
+    it('should show approve and reject buttons for pending membership cards', () => {
+      fixture.detectChanges();
+      const req = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      req.flush([mockPendingMembership]);
+      fixture.detectChanges();
+
+      const buttons: NodeListOf<HTMLButtonElement> = fixture.nativeElement.querySelectorAll('button');
+      const buttonTexts = Array.from(buttons).map((b) => b.textContent?.trim());
+      expect(buttonTexts).toContain('Genehmigen');
+      expect(buttonTexts).toContain('Ablehnen');
+    });
+
+    it('should show empty state for pending tab when no pending memberships', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+      fixture.detectChanges();
+
+      const emptyMsg = fixture.nativeElement.querySelector('.bg-gray-50 p');
+      expect(emptyMsg?.textContent).toContain('Keine wartenden Mitgliedschaftsanträge');
+    });
+
     it('should show table view for active tab', () => {
       fixture.detectChanges();
-      const pendingReq = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      flushPendingRequest();
-      pendingReq.flush([]);
 
       component.switchTab('active');
       const allReq = httpMock.expectOne(
@@ -228,8 +472,7 @@ describe('AdminMembershipsComponent', () => {
 
     it('should show table view for all tab', () => {
       fixture.detectChanges();
-      const pendingReq = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      flushPendingRequest();
-      pendingReq.flush([]);
 
       component.switchTab('all');
       const allReq = httpMock.expectOne(
@@ -243,5 +486,89 @@ describe('AdminMembershipsComponent', () => {
       const rows = fixture.nativeElement.querySelectorAll('tbody tr');
       expect(rows.length).toBe(2);
     });
+
+    it('should show empty state for active tab when no active memberships', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.switchTab('active');
+      const allReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships') && !r.url.includes('/pending'),
+      );
+      allReq.flush([]);
+      fixture.detectChanges();
+
+      const emptyMsg = fixture.nativeElement.querySelector('.bg-gray-50 p');
+      expect(emptyMsg?.textContent).toContain('Keine aktiven Mitgliedschaften');
+    });
+
+    it('should show empty state for all tab when no memberships exist', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.switchTab('all');
+      const allReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships') && !r.url.includes('/pending'),
+      );
+      allReq.flush([]);
+      fixture.detectChanges();
+
+      const emptyMsg = fixture.nativeElement.querySelector('.bg-gray-50 p');
+      expect(emptyMsg?.textContent).toContain('Keine Mitgliedschaften vorhanden');
+    });
+
+    it('should show status badge in table row', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.switchTab('all');
+      const allReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships') && !r.url.includes('/pending'),
+      );
+      allReq.flush([mockActiveMembership]);
+      fixture.detectChanges();
+
+      const badge = fixture.nativeElement.querySelector('span.rounded-full');
+      expect(badge).toBeTruthy();
+      expect(badge?.textContent?.trim()).toBe('Aktiv');
+    });
+
+    it('should show status badge in all tab table', () => {
+      fixture.detectChanges();
+      flushPendingRequest();
+
+      component.switchTab('all');
+      const allReq = httpMock.expectOne(
+        (r) => r.url.includes('/admin/memberships') && !r.url.includes('/pending'),
+      );
+      allReq.flush([mockActiveMembership]);
+      fixture.detectChanges();
+
+      const badge = fixture.nativeElement.querySelector('span.rounded-full');
+      expect(badge?.textContent?.trim()).toBe('Aktiv');
+    });
+
+    it('should display user name and email in pending card', () => {
+      fixture.detectChanges();
+      const req = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      req.flush([mockPendingMembership]);
+      fixture.detectChanges();
+
+      const cardText = fixture.nativeElement.querySelector('.bg-white.border')?.textContent;
+      expect(cardText).toContain('Max Mustermann');
+      expect(cardText).toContain('max@test.at');
+    });
+
+    it('should display community, atNumber and priority in pending card', () => {
+      fixture.detectChanges();
+      const req = httpMock.expectOne((r) => r.url.includes('/admin/memberships/pending'));
+      req.flush([mockPendingMembership]);
+      fixture.detectChanges();
+
+      const cardText = fixture.nativeElement.querySelector('.bg-white.border')?.textContent;
+      expect(cardText).toContain('Test Community');
+      expect(cardText).toContain('AT0000000000000000001');
+      expect(cardText).toContain('1');
+    });
   });
 });

eeg_frontend/src/app/pages/user-tariff/user-tariff.ts

@@ -189,7 +189,9 @@ export class UserTariffComponent implements OnInit, OnDestroy {
   onDelete(tariff: UserTariffResponse) {
     if (!confirm('Möchtest du diesen Tarif wirklich löschen?')) return;
 
-    this.userTariffService.deleteUserTariff(tariff.id!).subscribe({
+    const userId = this.authService.getCurrentUserId();
+    if (!userId) return;
+    this.userTariffService.deleteUserTariff(tariff.id!, userId).subscribe({
       next: () => {
         this.toastService.success('Tarif erfolgreich gelöscht.');
         this.loadUserTariffs(this.selectedCommunityId());