@Test
  public void isValidNoUsername() {
    ValidationResult result =
        RemoveOrganizationBillingManagerByUsernameRequest.builder()
            .organizationId("test-organization-id")
            .build()
            .isValid();

    assertEquals(INVALID, result.getStatus());
    assertEquals("username must be specified", result.getMessages().get(0));
  }
  @Test
  public void isValid() {
    ValidationResult result =
        RemoveOrganizationBillingManagerByUsernameRequest.builder()
            .organizationId("test-organization-id")
            .username("test-username")
            .build()
            .isValid();

    assertEquals(VALID, result.getStatus());
  }