Are these such extreme cases that I have to consider when using unit testing?

Question

When writing unit tests, it is usually recommended to check edge cases.

However, are they the right thing?

• Check that the connection to db is not open (it is claimed that an exception is thrown)
• Assert that a table that should always have> 1 row does this
• Assert that the field that is required is! = Null.
• Confirm that ip was installed in the correct format (I can parse the string to IP).

thank

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