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JSDOM doesn't implement the submit method on form elements. It does have a submit method but this just fires a 'not implemented' error. We need to spy on form submissions fired by clicking on the submit button but can't because this event calls the submit method internally so spying on `form.submit` doesn't work. This adds a helper which spies on the internal method that is actually called. When JSDOM implements the submit method properly this should be removed.
34 lines
1.2 KiB
JavaScript
34 lines
1.2 KiB
JavaScript
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// helper for spying on the submit method on a form element
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// JSDOM's implementation of submit just wraps a 'not implemented' error so we need to mock that to track calls to it
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//
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// * Remove when JSDOM implements submit on its form elements *
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//
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// elements in JSDOM have a public API and a private implementation API, only used by internal code
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// For form elements, these are instances of the following classes:
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// - HTMLFormElement
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// - HTMLFormElementImpl
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//
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// form elements link to their implementation instance via a symbol property
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// this spies on the submit method of the implementation instance for a form element and mocks it to prevent 'not implemented' errors
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function spyOnFormSubmit (jest, form) {
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const formImplementationSymbols = Object.getOwnPropertySymbols(form).filter(
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symbol => form[symbol].constructor.name === 'HTMLFormElementImpl'
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);
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if (!formImplementationSymbols.length) {
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throw Error("Error mocking form.submit: symbol reference to HTMLFormElementImpl instance not found on form element");
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}
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const HTMLFormElementImpl = form[formImplementationSymbols[0]];
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const submitSpy = jest.spyOn(HTMLFormElementImpl, 'submit')
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submitSpy.mockImplementation();
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return submitSpy;
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};
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exports.spyOnFormSubmit = spyOnFormSubmit;
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