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ArenoAreno 

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

Best Answer chosen by Areno
ArenoAreno
This Might help for some one


public class AnimalLocator
{

  public static String getAnimalNameById(Integer id)
   {
        Http http = new Http();
        HttpRequest request = new HttpRequest();
        request.setEndpoint('https://th-apex-http-callout.herokuapp.com/animals/'+id);
        request.setMethod('GET');
        HttpResponse response = http.send(request);
          String strResp = '';
           system.debug('******response '+response.getStatusCode());
           system.debug('******response '+response.getBody());
        // If the request is successful, parse the JSON response.
        if (response.getStatusCode() == 200) 
        {
            // Deserializes the JSON string into collections of primitive data types.
           Map<String, Object> results = (Map<String, Object>) JSON.deserializeUntyped(response.getBody());
            // Cast the values in the 'animals' key as a list
           Map<string,object> animals = (map<string,object>) results.get('animal');
            System.debug('Received the following animals:' + animals );
            strResp = string.valueof(animals.get('name'));
            System.debug('strResp >>>>>>' + strResp );
        }
        return strResp ;
   }
  
}
AnimalLocatorTest class
@isTest
private class AnimalLocatorTest{
    @isTest static  void AnimalLocatorMock1() {
        Test.SetMock(HttpCallOutMock.class, new AnimalLocatorMock());
        string result=AnimalLocator.getAnimalNameById(3);
        string expectedResult='chicken';
        System.assertEquals(result, expectedResult);
    }
}
AnimalLocatorMock 
@isTest
global class AnimalLocatorMock implements HttpCalloutMock {
    global HTTPResponse respond(HTTPRequest request) {
         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;
    }
}

Thanks,

With Regards, 
Santhosh

All Answers

ArenoAreno
This Might help for some one


public class AnimalLocator
{

  public static String getAnimalNameById(Integer id)
   {
        Http http = new Http();
        HttpRequest request = new HttpRequest();
        request.setEndpoint('https://th-apex-http-callout.herokuapp.com/animals/'+id);
        request.setMethod('GET');
        HttpResponse response = http.send(request);
          String strResp = '';
           system.debug('******response '+response.getStatusCode());
           system.debug('******response '+response.getBody());
        // If the request is successful, parse the JSON response.
        if (response.getStatusCode() == 200) 
        {
            // Deserializes the JSON string into collections of primitive data types.
           Map<String, Object> results = (Map<String, Object>) JSON.deserializeUntyped(response.getBody());
            // Cast the values in the 'animals' key as a list
           Map<string,object> animals = (map<string,object>) results.get('animal');
            System.debug('Received the following animals:' + animals );
            strResp = string.valueof(animals.get('name'));
            System.debug('strResp >>>>>>' + strResp );
        }
        return strResp ;
   }
  
}
AnimalLocatorTest class
@isTest
private class AnimalLocatorTest{
    @isTest static  void AnimalLocatorMock1() {
        Test.SetMock(HttpCallOutMock.class, new AnimalLocatorMock());
        string result=AnimalLocator.getAnimalNameById(3);
        string expectedResult='chicken';
        System.assertEquals(result, expectedResult);
    }
}
AnimalLocatorMock 
@isTest
global class AnimalLocatorMock implements HttpCalloutMock {
    global HTTPResponse respond(HTTPRequest request) {
         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;
    }
}

Thanks,

With Regards, 
Santhosh
This was selected as the best answer
Francis CrumpFrancis Crump
Nicely done Santhosh.  Note that:

in AnimalLocatorTest class line 3:

3    @isTest static  void AnimalLocatorMock1() {

I had to delete the 1 making it:

@isTest static  void AnimalLocatorMock() {

(and then run all) to get it to pass.