test login error contract

frontend/website/cypress/e2e/login.cy.ts

@@ -80,10 +80,10 @@ describe('password login', () => {
     cy.location('pathname').should('equal', '/login')
   })
 
-  it('shows a generic invalid-credentials error', () => {
+  it('shows the backend invalid-credentials error', () => {
     cy.intercept('POST', '**/api/login', {
       statusCode: 401,
-      body: { error: 'invalid_credentials' },
+      body: { error: 'invalid credentials' },
     }).as('login')
 
     cy.visit('/login')
@@ -92,20 +92,15 @@ describe('password login', () => {
     cy.wait('@login')
 
     cy.get('[role="alert"]')
-      .should('have.text', 'Email or password is incorrect.')
+      .should('have.text', 'invalid credentials')
       .and('be.visible')
     cy.location('pathname').should('equal', '/login')
   })
 
-  it('shows backend field validation errors', () => {
+  it('shows backend request errors', () => {
     cy.intercept('POST', '**/api/login', {
-      statusCode: 422,
-      body: {
-        message: 'The email field must be a valid email address.',
-        errors: {
-          email: ['The email field must be a valid email address.'],
-        },
-      },
+      statusCode: 400,
+      body: { error: 'email is required' },
     }).as('login')
 
     cy.visit('/login')
@@ -113,34 +108,20 @@ describe('password login', () => {
     cy.get('form').submit()
     cy.wait('@login')
 
-    cy.get('#login-email-error')
-      .should(
-        'have.text',
-        'The email field must be a valid email address.',
-      )
+    cy.get('[role="alert"]')
+      .should('have.text', 'email is required')
       .and('be.visible')
+    cy.get('#login-email-error').should('not.exist')
   })
 
-  it('shows throttling and malformed-response errors', () => {
-    cy.intercept('POST', '**/api/login', {
-      statusCode: 429,
-      body: { message: 'Too Many Attempts.' },
-    }).as('throttledLogin')
-
-    cy.visit('/login')
-    fillLoginForm()
-    cy.get('form').submit()
-    cy.wait('@throttledLogin')
-    cy.get('[role="alert"]').should(
-      'have.text',
-      'Too many login attempts. Try again in a minute.',
-    )
-
+  it('shows a malformed-response error', () => {
     cy.intercept('POST', '**/api/login', {
       statusCode: 200,
       body: { user: { id: 7 } },
     }).as('malformedLogin')
 
+    cy.visit('/login')
+    fillLoginForm()
     cy.get('form').submit()
     cy.wait('@malformedLogin')
     cy.get('[role="alert"]').should(