React Testing Library Tutorial #14 Assertion methods in React Testing Library
0Assertion methods in React Testing Library
toBeInTheDocument():
Checks if a given element is present in the document. This assertion is useful for ensuring that a component is rendered and available in the DOM.
toHaveTextContent(content: string | RegExp):
Verifies whether an element contains the specified text content. This assertion is handy for checking the rendered text within a component.
toHaveAttribute():
Asserts that an element has a specific attribute and optionally checks its value. This method is useful for validating the presence and value of attributes like href, src, etc.
toHaveClass(className: string):
Checks if an element has a particular CSS class applied to it. This assertion helps ensure that the correct styles are applied to the component.
toHaveStyle(css: string | object):
Verifies that an element has the specified inline styles. This method is useful for testing dynamic styling applied to components.
toHaveValue():
Asserts that a form element (like input, textarea, or select) has a specific value. This assertion is beneficial for testing controlled components.
toBeDisabled():
getBy:
getByLabelText: Finds an element by its associated label text.
getByPlaceholderText: Finds an input element by its placeholder text.
getByText: Finds an element by its visible text content.
getByRole: Finds an element by its ARIA role.
getByTestId: Finds an element by its data-testid attribute.
queryBy: Similar to getBy methods, but they return null if the element is not found or multiple elements match. These are useful when you expect the element not to be present in certain cases.
queryByLabelText
queryByPlaceholderText
queryByText
queryByRole
queryByTestId
findBy:
findByLabelText
findByPlaceholderText
findByText
findByRole
findByTestId
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