diff --git a/frontend/src/views/Pages/Login.spec.js b/frontend/src/views/Pages/Login.spec.js
index a4ff79bed..2339cd341 100644
--- a/frontend/src/views/Pages/Login.spec.js
+++ b/frontend/src/views/Pages/Login.spec.js
@@ -131,7 +131,7 @@ describe('Login', () => {
           await wrapper.find('form').trigger('submit')
           await flushPromises()
           expect(wrapper.findAll('div.invalid-feedback').at(1).text()).toBe(
-            'The password field is required',
+            'The form.password field is required',
           )
         })
       })
diff --git a/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.spec.js b/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.spec.js
index b1d705952..48bbe6b70 100644
--- a/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.spec.js
+++ b/frontend/src/views/Pages/UserProfile/UserCard_FormUsername.spec.js
@@ -24,6 +24,10 @@ const mockAPIcall = jest.fn((args) => {
   return { success: true }
 })
 
+const toastErrorMock = jest.fn()
+const toastSuccessMock = jest.fn()
+const storeCommitMock = jest.fn()
+
 loginAPI.changeUsernameProfile = mockAPIcall
 
 describe('UserCard_FormUsername', () => {
@@ -37,10 +41,11 @@ describe('UserCard_FormUsername', () => {
         email: 'user@example.org',
         username: '',
       },
-      commit: jest.fn(),
+      commit: storeCommitMock,
     },
     $toast: {
-      success: jest.fn(),
+      success: toastSuccessMock,
+      error: toastErrorMock,
     },
   }
 
@@ -111,10 +116,43 @@ describe('UserCard_FormUsername', () => {
             expect(wrapper.find('div.display-username').text()).toEqual('@username')
           })
 
+          it('commits the username to the store', () => {
+            expect(storeCommitMock).toBeCalledWith('username', 'username')
+          })
+
+          it('toasts an success message', () => {
+            expect(toastSuccessMock).toBeCalledWith('site.profil.user-data.change-success')
+          })
+
           it('has no edit button anymore', () => {
             expect(wrapper.find('svg.bi-pencil').exists()).toBeFalsy()
           })
         })
+
+        describe('submit retruns error', () => {
+          beforeEach(async () => {
+            jest.clearAllMocks()
+            mockAPIcall.mockReturnValue({
+              success: false,
+              result: { message: 'Error' },
+            })
+            await wrapper.find('input[placeholder="Username"]').setValue('username')
+            await wrapper.find('form').trigger('submit')
+            await flushPromises()
+          })
+
+          it('calls the loginAPI', () => {
+            expect(mockAPIcall).toHaveBeenCalledWith(1, 'user@example.org', 'username')
+          })
+
+          it('toasts an error message', () => {
+            expect(toastErrorMock).toBeCalledWith('Error')
+          })
+
+          it('renders an empty username', () => {
+            expect(wrapper.find('div.display-username').text()).toEqual('@')
+          })
+        })
       })
     })
   })