Programming Elixir 1.6 by Dave Thomas

Author:Dave Thomas
Language: eng
Format: epub
Tags: Pragmatic Bookshelf
Publisher: Pragmatic Bookshelf

Property-Based Testing

When you use assertions, you work out ahead of time the result you expect your function to return. This is good, but it also has some limitations. In particular, any assumptions you made while writing the original code are likely to find their way into the tests, too.

A different approach is to consider the overall properties of the function you’re testing. For example, if your function converts a string to uppercase, then you can predict that, whatever string you feed it,

the length of the output will be the same as the length of the input, and

any lowercase characters in the input will have been replaced by their uppercase counterpart.

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