diff --git a/admin/src/components/Fedaration/FederationVisualizeItem.spec.js b/admin/src/components/Fedaration/FederationVisualizeItem.spec.js
index f865c3b08..aa829209a 100644
--- a/admin/src/components/Fedaration/FederationVisualizeItem.spec.js
+++ b/admin/src/components/Fedaration/FederationVisualizeItem.spec.js
@@ -92,43 +92,90 @@ describe('FederationVisualizeItem', () => {
         })
       })
 
-      // zwei Varianten: '' bei null und 
-      describe('with different locales (de, en, fr, es, nl)', () => {
-        it('computes the lastAnnouncedAt time', () => {
-          // expect(wrapper.find('.row > div:nth-child(3)').text()).toBe('3 days ago')
+      // describe('with different locales (de, en, fr, es, nl)', () => {
+      describe('lastAnnouncedAt', () => {
+        it('computes the time string for different locales (de, en, fr, es, nl)', () => {
           wrapper.vm.$i18n.locale = 'de'
           wrapper = Wrapper()
-          expect(wrapper.vm.lastAnnouncedAt).toContain('vor 3 Tagen')
+          expect(wrapper.vm.lastAnnouncedAt).toBe('vor 3 Tagen')
 
           wrapper.vm.$i18n.locale = 'fr'
           wrapper = Wrapper()
-          expect(wrapper.vm.lastAnnouncedAt).toContain('il y a 3 jours')
+          expect(wrapper.vm.lastAnnouncedAt).toBe('il y a 3 jours')
 
           wrapper.vm.$i18n.locale = 'es'
           wrapper = Wrapper()
-          expect(wrapper.vm.lastAnnouncedAt).toContain('hace 3 días')
+          expect(wrapper.vm.lastAnnouncedAt).toBe('hace 3 días')
 
           wrapper.vm.$i18n.locale = 'nl'
           wrapper = Wrapper()
-          expect(wrapper.vm.lastAnnouncedAt).toContain('3 dagen geleden')
+          expect(wrapper.vm.lastAnnouncedAt).toBe('3 dagen geleden')
         })
 
-        it('computes the createdAt time', () => {
+        describe('lastAnnouncedAt == null', () => {
+          beforeEach(() => {
+            propsData = {
+              item: {
+                id: 7590,
+                foreign: false,
+                publicKey: 'eaf6a426b24fd54f8fbae11c17700fc595080ca25159579c63d38dbc64284ba7',
+                url: 'http://localhost/api/api/2_0',
+                lastAnnouncedAt: null,
+                verifiedAt: null,
+                lastErrorAt: null,
+                createdAt: createdDate,
+                updatedAt: null,
+              },
+            }
+            wrapper = Wrapper()
+          })
+
+          it('computes empty string', async () => {
+            expect(wrapper.vm.lastAnnouncedAt).toBe('')
+          })
+        })
+      })
+
+      describe('createdAt', () => {
+        it('computes the time string for different locales (de, en, fr, es, nl)', () => {
           wrapper.vm.$i18n.locale = 'de'
           wrapper = Wrapper()
-          expect(wrapper.vm.createdAt).toContain('vor 3 Tagen')
+          expect(wrapper.vm.createdAt).toBe('vor 3 Tagen')
 
           wrapper.vm.$i18n.locale = 'fr'
           wrapper = Wrapper()
-          expect(wrapper.vm.createdAt).toContain('il y a 3 jours')
+          expect(wrapper.vm.createdAt).toBe('il y a 3 jours')
 
           wrapper.vm.$i18n.locale = 'es'
           wrapper = Wrapper()
-          expect(wrapper.vm.createdAt).toContain('hace 3 días')
+          expect(wrapper.vm.createdAt).toBe('hace 3 días')
 
           wrapper.vm.$i18n.locale = 'nl'
           wrapper = Wrapper()
-          expect(wrapper.vm.createdAt).toContain('3 dagen geleden')
+          expect(wrapper.vm.createdAt).toBe('3 dagen geleden')
+        })
+
+        describe('createdAt == null', () => {
+          beforeEach(() => {
+            propsData = {
+              item: {
+                id: 7590,
+                foreign: false,
+                publicKey: 'eaf6a426b24fd54f8fbae11c17700fc595080ca25159579c63d38dbc64284ba7',
+                url: 'http://localhost/api/api/2_0',
+                lastAnnouncedAt: createdDate,
+                verifiedAt: null,
+                lastErrorAt: null,
+                createdAt: null,
+                updatedAt: null,
+              },
+            }
+            wrapper = Wrapper()
+          })
+
+          it('computes empty string', async () => {
+            expect(wrapper.vm.createdAt).toBe('')
+          })
         })
       })
     })
diff --git a/admin/src/components/Fedaration/FederationVisualizeitem.spec.js b/admin/src/components/Fedaration/FederationVisualizeitem.spec.js
deleted file mode 100644
index d82a12f33..000000000
--- a/admin/src/components/Fedaration/FederationVisualizeitem.spec.js
+++ /dev/null
@@ -1,44 +0,0 @@
-import { mount } from '@vue/test-utils'
-import FederationVisualizeItem from './FederationVisualizeItem.vue'
-
-const localVue = global.localVue
-
-const mocks = {
-  $t: (key) => key,
-  $i18n: {
-    locale: 'de',
-    t: (key) => key,
-  },
-}
-
-describe('FederationVisualizeItem', () => {
-  let wrapper
-
-  const propsData = {
-    item: {
-      id: 7590,
-      foreign: false,
-      publicKey: 'eaf6a426b24fd54f8fbae11c17700fc595080ca25159579c63d38dbc64284ba7',
-      url: 'http://localhost/api/api/2_0',
-      lastAnnouncedAt: null,
-      verifiedAt: null,
-      lastErrorAt: null,
-      createdAt: '2023-03-29T04:46:38.823Z',
-      updatedAt: null,
-    },
-  }
-
-  const Wrapper = () => {
-    return mount(FederationVisualizeItem, { localVue, mocks, propsData })
-  }
-
-  describe('mount', () => {
-    beforeEach(() => {
-      wrapper = Wrapper()
-    })
-
-    it('renders the component', () => {
-      expect(wrapper.find('div.federation-visualize-item').exists()).toBe(true)
-    })
-  })
-})