Examples of using Mock function in English and their translations into Romanian
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Foo is a mock function.
The mock function was called at least once.
You can create a mock function with jest. fn().
Accepts a value that will be returned for one call to the mock function.
Using a mock function.
Accepts a value that will be returned whenever the mock function is called.
The mock function is called twice.
Use. toHaveBeenCalled to ensure that a mock function got called.
Creates a mock function similar to jest.
An array that represents all calls that have been made into this mock function.
If you have a mock function, you can use.
This mocks out setTimeout andother timer functions with mock functions.
All mock functions have this special.
Can be chained so thatsuccessive calls to the mock function return different values.
Mock functions are also very effective in code that uses a functional continuation-passing style.
If no implementation is given, the mock function will return undefined when invoked.
An array that contains all the object instances that have been instantiated from this mock function using new.
ToHaveBeenCalledWith to ensure that a mock function was called with specific arguments.
For example: A mock function that has been instantiated twice would have the following mock. instances array.
ToHaveBeenCalledTimes to ensure that a mock function got called exact number of times.
Still, there are cases where it's useful to go beyond the ability to specify return values andfull-on replace the implementation of a mock function.
Finally, in order tomake it simpler to assert how mock functions have been called, we have added some custom matcher functions for you.
Mock functions are also known as"spies", because they let you spy on the behavior of a function that is called indirectly by some other code, rather than just testing the output.
The mockImplementation method is useful when you need to define the default implementation of a mock function that is created from another module.
To test this function, we can use a mock function, and inspect the mock's state to ensure the callback is invoked as expected.
Mock functions make it easy to test the links between code by erasing the actual implementation of a function, capturing calls to the function(and the parameters passed in those calls), capturing instances of constructor functions when instantiated with new, and allowing test-time configuration of return values.
Most real-world examples actually involve getting ahold of a mock function on a dependent component and configuring that, but the technique is the same.
For example: A mock function f that has been called twice, with the arguments f('arg1','arg2'), and then with the arguments f('arg3','arg4') would have a mock.
When you need to recreate a complex behavior of a mock function such that multiple function calls produce different results, use the mockImplementationOnce method.
Determines if the given function is a mocked function.