Mock / stub with integration testing in Java

Question

I'm using rest-assured for integration testing on my endpoints. One of the endpoints has a dependency to another resource (it calls another API conditionally). Is there a way for me to stub out the API call so I can write a test for that case?

Answer 1

Lets say your code calls endpointB internally via http, you can stub that api by using https://github.com/katta/fakerest or https://stubby4j.com .So when your code makes a call internally to the another api, it will hit these stubs, which will return a dummy response always. Hope this helps.

Answer 2

interface IDataProvider {
 string RetrieveData();
}

class StandardDataProvider : IDataProvider {
 public string RetrieveData(){
  // call to API
 }
}

class Program {
 private IDataProvider _dataProvider;

 public Program(IDataProvider provider = null) {
  _dataProvider = provider ?? new StandardProvider();
 }

 public void MethodToTest(){
  var data = _dataProvider.RetrieveData();
  // do your thing
 }
}

In the tests you can mock the data by creating your own IDataProvider object and working with its data.

class TestDataProvider : IDataProvider {
 public string RetrieveData(){
  return "my own data";
 }
}

class Test {
 [TestMethod]
 public void TestProgram(){
  var obj = new Program(new TestDataProvider);
  var result = obj.MethodToTest();
  // asserts
 }
}