@Test
public void testCreateCanonicalHeaders() {
Map<String, String> headers = new HashMap<String, String>();
headers.put("Content-Type", " application/json ");
headers.put("Host", "http://localhost");
String result = SignUtil.createCanonicalHeaders(headers);
assertThat(result, is("content-type:application/json\nhost:http://localhost"));
}
@Test
public void testCreateCanonicalHeaders_withEmptyMap() {
assertThat(SignUtil.createCanonicalHeaders(null), is(""));
assertThat(SignUtil.createCanonicalHeaders(new HashMap<String, String>()), is(""));
}