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Property-Based Testing with PropEr, Erlang, and Eliixir (Paperback)
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Property-Based Testing with PropEr, Erlang, and Eliixir (Paperback)
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Property-based testing helps you create better, more solid tests
with little code. By using the PropEr framework in both Erlang and
Elixir, this book teaches you how to automatically generate test
cases, test stateful programs, and change how you design your
software for more principled and reliable approaches. You will be
able to better explore the problem space, validate the assumptions
you make when coming up with program behavior, and expose
unexpected weaknesses in your design. PropEr will even show you how
to reproduce the bugs it found. With this book, you will be writing
efficient property-based tests in no time. Most tests only
demonstrate that the code behaves how the developer expected it to
behave, and therefore carry the same blind spots as their authors
when special conditions or edge cases show up. Learn how to see
things differently with property tests written in PropEr. Start
with the basics of property tests, such as writing stateless
properties, and using the default generators to generate test cases
automatically. More importantly, learn how to think in properties.
Improve your properties, write custom data generators, and discover
what your code can or cannot do. Learn when to use property tests
and when to stick with example tests with real-world sample
projects. Explore various testing approaches to find the one that's
best for your code. Shrink failing test cases to their simpler
expression to highlight exactly what breaks in your code, and
generate highly relevant data through targeted properties. Uncover
the trickiest bugs you can think of with nearly no code at all with
two special types of properties based on state transitions and
finite state machines. Write Erlang and Elixir properties that
generate the most effective tests you'll see, whether they are unit
tests or complex integration and system tests. What You Need Basic
knowledge of Erlang, optionally Elixir For Erlang tests: Erlang/OTP
>= 20.0, with Rebar >= 3.4.0 For Elixir tests: Erlang/OTP
>= 20.0, Elixir >= 1.5.0
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