`self.initfp()` is very unlikely raise exceptions. But MemoryError, KeyboardInterrupt or other rare exceptions may be happen.
unittest.mock helps a lot to test such corner case: mock initfp() with a MemoryError side effect, maybe also close () to check that the method was called... The new problem is that on 3 instructions, 2 are mocked... The test now checks the test itself or the real application? Victor
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