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The method for creating unit tests for HttpServerErrorException and HttpClientErrorException depends on the programming language and testing framework being used. However, in general, the following steps can be followed:

1. Set up a mock server that returns a response status code that would trigger the HttpServerErrorException or HttpClientErrorException.
2. Instantiate an instance of the HttpClient (or equivalent) class and configure it to use the mock server.
3. Execute the API call that would trigger the expected exception.
4. Assert that the exception was thrown and that its status code and message match the expected values.

For example, in Java using the Spring framework and JUnit, the following test case could be created:

@ExtendWith(MockitoExtension.class)
public class MyApiClientTest {

    @Mock
    private RestTemplate restTemplate;

    @Test
    public void testApiCallThrowsHttpServerErrorException() {
        MockRestServiceServer server = MockRestServiceServer.createServer(restTemplate);
        server.expect(requestTo("/api/resource"))
              .andRespond(withServerError());

        MyApiClient client = new MyApiClient(restTemplate, "https://example.com");

        HttpServerErrorException thrown = assertThrows(HttpServerErrorException.class, () -> {
            client.getResource();
        });

        assertEquals(HttpStatus.INTERNAL_SERVER_ERROR, thrown.getStatusCode());
        assertTrue(thrown.getMessage().contains("Server error"));
    }

    @Test
    public void testApiCallThrowsHttpClientErrorException() {
        MockRestServiceServer server = MockRestServiceServer.createServer(restTemplate);
        server.expect(requestTo("/api/resource"))
              .andRespond(withStatus(HttpStatus.UNAUTHORIZED)
                          .body("Unauthorized"));

        MyApiClient client = new MyApiClient(restTemplate, "https://example.com");

        HttpClientErrorException thrown = assertThrows(HttpClientErrorException.class, () -> {
            client.getResource();
        });

        assertEquals(HttpStatus.UNAUTHORIZED, thrown.getStatusCode());
        assertTrue(thrown.getMessage().contains("Unauthorized"));
    }
}