@Test
  public void testExtractMailAllowedEmailFrom() {
    List<Member> members = new ArrayList<Member>();
    Member member = new Member();
    member.setIsAllowedEmail(true);
    member.setEmail("*****@*****.**");
    members.add(member);
    member = new Member();
    member.setIsAllowedEmail(false);
    member.setEmail("*****@*****.**");
    members.add(member);
    member = new Member();
    member.setIsAllowedEmail(true);
    member.setEmail("whiteship20om");
    members.add(member);

    String[] mails = EmailExtractUtil.extractMailAllowedEmailFrom(members);
    assertThat(mails.length, is(1));
  }