@Test
public void testParseQueryString() throws Exception {

    assertThat(StringUtils.getQueryStringValue("key1=value1&key2=value2", "key1"), equalTo("value1"));
    assertThat(StringUtils.getQueryStringValue("key1=value1&key2=value2", "key2"), equalTo("value2"));
    assertThat(StringUtils.getQueryStringValue("", "key1"), isEmptyOrNullString());
}