Eternus Training Session : REST Code Snippets

Readme.md

Tools

• Mock Response : https://mocky.io
• Postman : https://www.getpostman.com/
• Workbench : https://workbench.developerforce.com/login.php?startUrl=%2FrestExplorer.php

References

• Username-Password OAuth Authentication Flow : https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/intro_understanding_username_password_oauth_flow.htm
• HTTP Response Code Reference : https://developer.mozilla.org/en-US/docs/Web/HTTP/Status

Notes

• Create connected app with Enable OAuth Settings set to true
• Use https://login.salesforce.com/services/oauth2/success as a Callback URL
• Give full access for assignment purpose only

EchoService.java

@RestResource(urlMapping='/echo/*')
global class EchoService {
    
    @HttpGet
    global static String helloWorld() {
        return 'Hello, Eternus!';    
    }
    
    @HttpPost
    global static String echo() {
        RestRequest request = RestContext.request;
        String requestBody = '';
        if( request.requestBody!=null ) {
            requestBody =  request.requestBody.toString();
        }
        
        return requestBody;
    }
}

EchoServiceTest.java

@IsTest
public class EchoServiceTest {
    
    //Test Post Service
    public testmethod static void testEchoPositive(){
        RestRequest mockRequest = new RestRequest();
        mockRequest.requestUri ='https://swapnilshrikhande-dev-ed.my.salesforce.com/services/apexrest/echo';
        mockRequest.httpMethod = 'POST';
        mockRequest.requestBody = Blob.valueof('Hello, World');
        Test.startTest();
            //
            RestContext.request = mockRequest;
            String responseMessage = EchoService.echo();
        Test.stopTest();
        System.assertEquals('Hello, World', responseMessage,'Echo failed, response should match input.');
    }
    
    public testmethod static void testEchoNegative(){
        RestRequest mockRequest = new RestRequest();
        mockRequest.requestUri ='https://swapnilshrikhande-dev-ed.my.salesforce.com/services/apexrest/echo';
        mockRequest.httpMethod = 'POST';
        mockRequest.requestBody = null;
        Test.startTest();
            RestContext.request = mockRequest;
            String responseMessage = EchoService.echo();
        Test.stopTest();
        System.assertEquals('', responseMessage,'Echo failed, null request must return blank response.');
    }
    
    public testmethod static void testHelloWorld(){
        RestRequest mockRequest = new RestRequest();
        mockRequest.requestUri ='https://swapnilshrikhande-dev-ed.my.salesforce.com/services/apexrest/echo';
        mockRequest.httpMethod = 'GET';
        
        Test.startTest();
            RestContext.request = mockRequest;
            String responseMessage = EchoService.helloWorld();
        Test.stopTest();
        System.assertEquals('Hello, Eternus!', responseMessage,'Hello World Get Service Failed.');
    }
}

RestConsume.java

public class RestConsume {
    
    public static String fetchData(){
        HttpRequest requestPacket = new HttpRequest();
        requestPacket.setEndpoint('http://www.mocky.io/v2/5bf3c1ce3100001300619928');
        requestPacket.setMethod('GET');
        Http httpConnection = new Http();
        HTTPResponse responsePacket = httpConnection.send(requestPacket);
        Integer statusCode = responsePacket.getStatusCode();
        if( statusCode == 200 ){
        	//handle success here    
        } else if( statusCode == 400 ){
            //handle error here
        } /* else {} we should handle all possible error codes */
        System.debug(responsePacket.getStatusCode());
        System.debug(responsePacket.getBody());
        return responsePacket.getBody();
    }
}

RestConsumeHttpMock.java

public class RestConsumeHttpMock implements HttpCalloutMock {
    
    public Integer status;
    public String response;
    
    public RestConsumeHttpMock(Integer statusParam,String  responseParam){
        this.status = statusParam;
        this.response = responseParam;
    }
    
    //temporary server / test ke liye server    
    public HTTPResponse respond(HTTPRequest request) {
        HttpResponse response = new HttpResponse();
        response.setStatusCode(this.status );
        response.setBody(this.response);
        return response;
    }
}

RestConsumeTest.java

@IsTest
public class RestConsumeTest {
    public testmethod static void testHelloWorldPositive(){
        //Create a mock response / acting server
        RestConsumeHttpMock mockResponse = new RestConsumeHttpMock(200,'Hello, World');
        //Let the test class context know where to get the response from
        Test.setMock(HttpCalloutMock.class, mockResponse);
        Test.startTest();
            String responseMessage = RestConsume.fetchData();
        Test.stopTest();
        System.assertEquals('Hello, World', responseMessage,'Hello World Rest Consume Service Failed.');
    }
    
    public testmethod static void testHelloWorldNegative(){
        //Create a mock response / acting server
        RestConsumeHttpMock mockResponse = new RestConsumeHttpMock(500,'');
        //Let the test class context know where to get the response from
        Test.setMock(HttpCalloutMock.class, mockResponse);
        Test.startTest();
            String responseMessage = RestConsume.fetchData();
        Test.stopTest();
        System.assertNotEquals('Hello, World', responseMessage,'Hello World Rest Consume Service Failed.');
    }
}

RestService.java

@RestResource(urlMapping='/restdemo/*')
global class RestService {
    @HttpGet
    global static String helloWorld() {
      return 'Hello, Eternus!';    
    }
}