@Test
public void test_readOIDCCredFile_Failure() throws IOException{

    File oidccredFile = getOIDCCredFile();
    boolean isDelete = true;
    OIDCCred expected = new OIDCCred();
    expected.setClientId("123123");
    expected.setClientName("clientname1");
    expected.setClientSecret("abcd123123");
    expected.setBoundAudiences("defg123123");
    expected.setDiscoveryUrl("https://login.microsoftonline.com/123123/v2.0");
    expected.setAdLoginUrl("https://login.microsoftonline.com/123123/oauth2/token");
    ReflectionTestUtils.setField(ControllerUtil.class,"oidcCred", null);
    SSCred actual = ControllerUtil.readSSCredFile(oidccredFile.getAbsolutePath(), isDelete);
    assertNull(actual);
}