// TODO: add cases for username no existing external user with username not email
  @Test
  public void accept_invitation_with_external_user_that_does_not_have_email_as_their_username() {
    String userId = "user-id-001";
    String email = "*****@*****.**";
    String actualUsername = "******";
    ScimUser userBeforeAccept = new ScimUser(userId, email, "first", "last");
    userBeforeAccept.setPrimaryEmail(email);
    userBeforeAccept.setOrigin(Origin.SAML);

    when(scimUserProvisioning.verifyUser(eq(userId), anyInt())).thenReturn(userBeforeAccept);
    when(scimUserProvisioning.retrieve(eq(userId))).thenReturn(userBeforeAccept);

    BaseClientDetails clientDetails =
        new BaseClientDetails("client-id", null, null, null, null, "http://example.com/redirect");
    when(clientDetailsService.loadClientByClientId("acmeClientId")).thenReturn(clientDetails);

    Map<String, String> userData = new HashMap<>();
    userData.put(USER_ID, userBeforeAccept.getId());
    userData.put(EMAIL, userBeforeAccept.getPrimaryEmail());
    userData.put(REDIRECT_URI, "http://someother/redirect");
    userData.put(CLIENT_ID, "acmeClientId");
    when(expiringCodeStore.retrieveCode(anyString()))
        .thenReturn(
            new ExpiringCode(
                "code",
                new Timestamp(System.currentTimeMillis()),
                JsonUtils.writeValueAsString(userData)));

    ScimUser userAfterAccept =
        new ScimUser(
            userId,
            actualUsername,
            userBeforeAccept.getGivenName(),
            userBeforeAccept.getFamilyName());
    userAfterAccept.setPrimaryEmail(email);

    when(scimUserProvisioning.verifyUser(eq(userId), anyInt())).thenReturn(userAfterAccept);

    ScimUser acceptedUser = emailInvitationsService.acceptInvitation("code", "password").getUser();
    assertEquals(userAfterAccept.getUserName(), acceptedUser.getUserName());
    assertEquals(userAfterAccept.getName(), acceptedUser.getName());
    assertEquals(userAfterAccept.getPrimaryEmail(), acceptedUser.getPrimaryEmail());

    verify(scimUserProvisioning).verifyUser(eq(userId), anyInt());
  }