@Test
public void post_shouldPostUrlParametersAndGetResponse() throws IOException {
Map<String, String> parameters = new TreeMap<>();
parameters.put("one", "one");
parameters.put("two", "two");
ByteArrayOutputStream stream = new ByteArrayOutputStream();
when(connection.getOutputStream()).thenReturn(stream);
when(connection.getInputStream()).thenReturn(new ByteArrayInputStream("response".getBytes()));
String response = client.post(parameters);
verify(connection).setDoOutput(true);
verify(connection).setDoInput(true);
verify(connection).setRequestMethod("POST");
verify(connection).setRequestProperty("Content-Length", String.valueOf(16));
verify(connection).setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
assertThat(stream.toString(), is("&one=one&two=two"));
assertThat(response, CoreMatchers.containsString("response"));
}
}