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In order to solve the matcher error: received value must be a mock or spy function,
you need to ensure that the value being passed to a specific function is either a mock or spy function.
A common scenario where this error occurs is when using testing frameworks like Jest or Jasmine,
and when asserting that a certain function has been called with the correct parameters.
In such cases, the expected value should be a mock or spy function.
Here’s an example using Jest:
// Sample code
const myFunction = jest.fn();
const myParam = 'example';
// Calling the function with the parameter
myFunction(myParam);
// Asserting that the function was called with the correct parameter
expect(myFunction).toHaveBeenCalledWith(myParam);
In the above example, myFunction is a mock function created with jest.fn().
It expects to receive a certain parameter value defined as myParam.
The toHaveBeenCalledWith matcher is then used to assert that the function was called with the expected parameter.
Make sure to adjust the code according to your specific use case and testing framework.
Remember that the key is to ensure that the value being passed to the function is a mock or spy function.