Apex REST Callouts - Create an Apex class that calls a REST endpoint and write a test class.

To pass this challenge, create an Apex class that calls a REST endpoint to return the name of an animal, write unit tests that achieve 100% code coverage for the class using a mock response, and run your Apex tests.

• The Apex class must be called 'AnimalLocator', have a 'getAnimalNameById' method that accepts an Integer and returns a String.
• The 'getAnimalNameById' method must call https://th-apex-http-callout.herokuapp.com/animals/id, using the ID passed into the method. The method returns the value of the 'name' property (i.e., the animal name).
• Create a test class named AnimalLocatorTest that uses a mock class called AnimalLocatorMock to mock the callout response.
• The unit tests must cover all lines of code included in the AnimalLocator class, resulting in 100% code coverage.
• Run your test class at least once (via 'Run All' tests the Developer Console) before attempting to verify this challenge.

AnimalLocator.apxc

public class AnimalLocator {
    public static String getAnimalNameById(Integer animalId ){
        String animalName;
        Http http = new Http();
        HttpRequest request = new HttpRequest();
        request.setEndpoint( 'https://th-apex-http-callout.herokuapp.com/animals/'+animalId);
        request.setMethod('GET');
        HttpResponse response = http.send(request);
        
        if(response.getStatusCode()==200){
            Map<String,Object> r = (Map<String, Object>)JSON.deserializeUntyped(response.getBody());
            Map<String,Object> animal = (Map<String, Object>)r.get('animal');
            animalName = string.valueOf(animal.get('name'));
            System.debug('The animal is: '+ animalName);
        }
        return animalName;
        
    } 
}

AnimalLocatorMock.apx

@isTest
global class AnimalLocatorMock implements HttpCalloutMock {
    global HTTPResponse respond(HTTPRequest request){
        //create a fake response
        HTTPResponse response = new HTTPResponse();
        response.setHeader('Content-Type', 'application/json');
        response.setBody('{"animal":{"id":1,"name":"chicken","eats":"chicken food","says":"cluck cluck"}}');
        response.setStatusCode(200);
        return response;
    }
}

AnimalLocatorTest.apxc

@isTest
private class AnimalLocatorTest {
    @isTest static void getAnimalNameByIdTest(){
        //Set mock callout class
        Test.setMock(HttpCalloutMock.class, new AnimalLocatorMock());
        
        String response = AnimalLocator.getAnimalNameById(1);
        System.assertEquals('chicken', response);
    }
}