January 2019
Intermediate to advanced
376 pages
8h 49m
English
Content preview from Property-Based Testing with PropEr, Erlang, and ElixirBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The Limitations of Default Generators
Default generators as we have used them are critical building blocks for our properties. They cover a large potential data space, which is absolutely useful in some types of tests. The properties that could be interesting to us may however require a very narrow focus on some limited edge cases. Generators covering a large data space can be useful to discover unexpected issues and problems, but possibly not great at exploring tricky areas known to likely contain bugs in our programs.
Let’s say that we’re writing a list of key and value pairs to insert in a map, and we want to make sure that as long as we enter keys and values in there, all the keys will be found in the map. We may get a property that looks ...
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