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Assertion helpers for arithmetic tests.
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Helper to assert that left and right cannot be added.
Parameters
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left : object
right : object
msg : str, default "cannot add"
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Helper to assert that left and right can be neither added nor subtracted.
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left : object
right : object
msg : str or None, default None
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Get the box to use for 'expected' in an arithmetic or comparison operation.
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Assert that comparison operations with mismatched types behave correctly.
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left : np.ndarray, ExtensionArray, Index, or Series
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