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85 lines
2.6 KiB
Markdown
85 lines
2.6 KiB
Markdown
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# RapidCheck property-based testing for Bitcoin Core
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## Concept
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Property-based testing is experimentally being added to Bitcoin Core with
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[RapidCheck](https://github.com/emil-e/rapidcheck), a C++ framework for
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property-based testing inspired by the Haskell library
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[QuickCheck](https://hackage.haskell.org/package/QuickCheck).
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RapidCheck performs random testing of program properties. A specification of the
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program is given in the form of properties which functions should satisfy, and
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RapidCheck tests that the properties hold in a large number of randomly
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generated cases.
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If an exception is found, RapidCheck tries to find the smallest case, for some
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definition of smallest, for which the property is still false and displays it as
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a counter-example. For example, if the input is an integer, RapidCheck tries to
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find the smallest integer for which the property is false.
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## Running
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If RapidCheck is installed, Bitcoin Core will automatically run the
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property-based tests with the unit tests during `make check`, unless the
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`--without-rapidcheck` flag is passed when configuring.
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For more information, run `./configure --help` and see `--with-rapidcheck` under
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Optional Packages.
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## Setup
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The following instructions have been tested with Linux Debian and macOS.
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1. Clone the RapidCheck source code and cd into the repository.
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```shell
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git clone https://github.com/emil-e/rapidcheck.git
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cd rapidcheck
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```
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2. Build RapidCheck (requires CMake to be installed).
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```shell
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cmake -DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=true -DRC_ENABLE_BOOST_TEST=ON $(pwd)
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make && make install
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```
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3. Configure Bitcoin Core with RapidCheck.
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`cd` to the directory of your local bitcoin repository and run
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`./configure`. In the output you should see:
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```shell
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checking rapidcheck.h usability... yes
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checking rapidcheck.h presence... yes
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checking for rapidcheck.h... yes
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[...]
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Options used to compile and link:
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[...]
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with test = yes
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with prop = yes
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```
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4. Build Bitcoin Core with RapidCheck.
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Now you can run `make` and should see the property-based tests compiled with
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the unit tests:
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```shell
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Making all in src
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[...]
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CXX test/gen/test_bitcoin-crypto_gen.o
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CXX test/test_bitcoin-key_properties.o
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```
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5. Run the unit tests with `make check`. The property-based tests will be run
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with the unit tests.
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```shell
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Running tests: crypto_tests from test/crypto_tests.cpp
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[...]
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Running tests: key_properties from test/key_properties.cpp
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```
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That's it! You are now running property-based tests in Bitcoin Core.
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