What does Sinon spy do?
Sinon spies are used to record information about function calls. Unlike mocks or stubs, spies do not replace the function being called. Spies just record what parameters the function was called with, what value it returned, and other information about the function execution.
How does Sinon stub work?
To stub a dependency (imported module) of a module under test you have to import it explicitly in your test and stub the desired method. For the stubbing to work, the stubbed method cannot be destructured, neither in the module under test nor in the test.
What is Sinon mock?
What are mocks? Mocks (and mock expectations) are fake methods (like spies) with pre-programmed behavior (like stubs) as well as pre-programmed expectations. A mock will fail your test if it is not used as expected.
What is a stub vs mock?
Stub: a dummy piece of code that lets the test run, but you don't care what happens to it. Substitutes for real working code. Mock: a dummy piece of code that you verify is called correctly as part of the test. Substitutes for real working code.
What is stubbing in testing?
A stub is a small piece of code that takes the place of another component during testing. The benefit of using a stub is that it returns consistent results, making the test easier to write. And you can run tests even if the other components are not working yet.
What is stub in API?
Plesk Extensions API stubs is a set of files with all classes definitions and methods prototypes, but without implementation of these methods. You can use API stubs for quicker development.
What is stub in node JS?
Stubs are functions or programs that affect the behavior of components or modules. Stubs are dummy objects for testing. Stubs implement a pre-programmed response.
How do you mock a function in Sinon?
You must call mock() on an object. To complete the test, you must call the verify() function to check that all the mock's expectations were met.
How do you mock a promise in Sinon?
promise();Creating a promise with a fake executor. var executor = sinon. fake(); var promise = sinon. ... Creating a promise with custom executor. var promise = sinon. promise(function (resolve, reject) { // ... ... promise. status. ... promise. resolvedValue. ... promise. rejectedValue. ... promise. resolve(value) ... promise. reject(value)
Why Spy is used in Mockito?
Simply put, the API is Mockito. spy() to spy on a real object. This will allow us to call all the normal methods of the object while still tracking every interaction, just as we would with a mock. Note how the real method add() is actually called and how the size of spyList becomes 2.
What is difference between @mock and @SPY?
The difference is that in mock, you are creating a complete mock or fake object while in spy, there is the real object and you just spying or stubbing specific methods of it. When using mock objects, the default behavior of the method when not stub is do nothing.
What is the difference between doReturn and thenReturn?
* Type safety : doReturn takes Object parameter, unlike thenReturn . Hence there is no type check in doReturn at compile time. In the case of thenReturn , whenever the type mismatches during runtime, the WrongTypeOfReturnValue exception is raised.
How do I stub an object in Sinon?
If you need to check that a certain value is set before a function is called, you can use the third parameter of stub to insert an assertion into the stub: var object = { }; var expectedValue = 'something'; var func = sinon. stub(example, 'func', function() { assert. equal(object.
What does sandbox stub do?
sandbox. Causes all stubs and mocks created from the sandbox to return promises using a specific Promise library instead of the global one when using stub. rejects or stub. resolves . Returns the stub to allow chaining.
What does it mean to stub a request?
What is a Stub? In testing land, a stub replaces real behavior with a fixed version. In the case of HTTP requests, instead of making the actual call, a stub fakes the call and provides a canned response that can be used to test against.
How can I retrieve my Sinon stub?
var stub = sinon. The original function can be restored by calling object. method. restore(); (or stub. restore(); ).