Unable to save Mock test class in trailhead

Question

I've started learning Apex Integration Services trailhead. I'm unable to save a test class AnimalsCalloutsTest:

@isTest
private class AnimalsCalloutsTest {

@isTest static  void testGetCallout() {
    // Create the mock response based on a static resource
    StaticResourceCalloutMock mock = new StaticResourceCalloutMock();
    mock.setStaticResource('GetAnimalResource');
    mock.setStatusCode(200);
    mock.setHeader('Content-Type', 'application/json;charset=UTF-8');
    // Associate the callout with a mock response
    Test.setMock(HttpCalloutMock.class, mock);
    // Call method to test
    HttpResponse result = AnimalsCallouts.makeGetCallout();
    // Verify mock response is not null
    System.assertNotEquals(null,result,
        'The callout returned a null response.');
    // Verify status code
    System.assertEquals(200,result.getStatusCode(),
      'The status code is not 200.');
    // Verify content type   
    System.assertEquals('application/json;charset=UTF-8',
      result.getHeader('Content-Type'),
      'The content type value is not expected.');  
    // Verify the array contains 3 items     
    Map<String, Object> results = (Map<String, Object>) 
        JSON.deserializeUntyped(result.getBody());
    List<Object> animals = (List<Object>) results.get('animals');
    System.assertEquals(3, animals.size(),
      'The array should only contain 3 items.');          
}   

}

I'm getting error while I'm trying to save this test class, it's showing error:

name                    line    problem
animalscalloutstest     12      method does not exist or incorrect signature: Test.setMock(Type, StaticResourceCalloutMock)

I'm testing this for get method and with static resource. Why am I getting this error can anyone tell me?

Answer 1

I'm afraid that you have created class Test:

public class test {

}

SalesForce tries to use custom class, where method setMock doesn't exist. You should remove/rename it or specify system namespace before:

system.Test.setMock(HttpCalloutMock.class, mock);