Zint backend test suite
-----------------------

In order to build the zint test suite, zint has to be compiled with the
ZINT_TEST option enabled:

  cd <project-dir>
  mkdir build
  cd build
  cmake -DZINT_TEST=ON ..
  cmake --build .

When using generators that support multiple build configurations, such as
Visual C++ Project Files (the default generator on win32), the configuration
can be provided via --config:

  cd <project-dir>
  mkdir build
  cd build
  cmake -DZINT_TEST=ON -DCMAKE_BUILD_TYPE=Debug ..
  cmake --build . --config Debug

Note specifying a matching CMAKE_BUILD_TYPE is required to set the test PATH
environment for Windows.
  
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In order to run the test suite, the path of the zint library may need to be
communicated to the runtime linker. On UNIX-like systems, this is done by
exporting LD_LIBRARY_PATH to the path containing the zint library, which is
<build-dir>/backend:

  cd <project-dir>
  cd build
  export LD_LIBRARY_PATH=$(pwd)/backend

Setting LD_LIBRARY_PATH is not required if the zint library to be tested is
installed into a system library path ( /usr/lib for example ) prior to running
the tests, or if the tests are not run individually.

(On Windows, the PATH may need to be set to include the DLL location.)

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To run all tests (within <build-dir>):

  ctest

When using a generator that does support multiple build configurations, the
configuration that was used to build the project has to be explicitly provided
to ctest, even if it was the default one:

  ctest -C Debug

For various useful options, e.g. matching (-R) and excluding (-E) tests, see
https://cmake.org/cmake/help/latest/manual/ctest.1.html#options

Tests can also be run individually, eg:

  backend/tests/test_common
  backend/tests/test_vector

To run a single test function within an individual test, use '-f <func-name>':

  backend/tests/test_common -f utf8_to_unicode
  backend/tests/test_dotcode -f input

To run a single dataset item in a single test function, use '-i <index>':

  backend/tests/test_dotcode -f input -i 2

To run a range of dataset items in a single test function, use '-i <start>-<end>':

  backend/tests/test_dotcode -f input -i 2-5

To exclude a single dataset item in a single test function, use '-x <index>':

  backend/tests/test_dotcode -f input -x 4

This can also take a range, '-x <start>-<end>':

  backend/tests/test_dotcode -f input -x 4-6

Exclude can be used multiple times (unlike '-i'):

  backend/tests/test_dotcode -f input -x 4 -x 6-8

The include and exclude options can be used together:

  backend/tests/test_dotcode -f input -i 2-7 -x 4 -x 6

To show debug info (if any), use '-d <flag>':

  backend/tests/test_dotcode -f input -i 2 -d 1

E.g. to print which dataset items are being run, use '-d 16':

  backend/tests/test_dotcode -f input -d 16 -i 2

(for other flags see <project-dir>/backend/tests/testcommon.h)

To run a test against BWIPP (if any), use '-d 128':

  backend/tests/test_composite -d 128

(see also <project-dir>/backend/tests/tools/run_bwipp_tests.sh)

To run a test against ZXing-C++ (if any), use '-d 512':

  backend/tests/test_rss -d 512

(see also <project-dir>/backend/tests/tools/run_zxingcpp_tests.sh)

To generate test data, use '-g':

  backend/tests/test_dotcode -f encode -g

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If the zint library was built with static linkage support, i.e. ZINT_STATIC
is ON, an additional test executable, which uses the zint-static library, will
be built. The static variant of each test shares the test name, but has a
"-static" suffix. For example,

  backend/tests/test_dotcode

would run the dotcode test that uses the shared zint library, while

  backend/tests/test_dotcode-static

runs the same test built against the zint-static library.

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To make with gcc sanitize, first set for libzint and make:

  cd <project-dir>
  cd build
  cmake -DZINT_SANITIZE=ON ..
  make && sudo make install

Similarly to make with gcc debug:

  cd <project-dir>
  cd build
  cmake -DZINT_DEBUG=ON ..
  make && sudo make install

To undo sanitize/debug, remake each after setting:

  cmake -DZINT_SANITIZE=OFF ..
  cmake -DZINT_DEBUG=OFF ..

To get a clean libzint, set the above and also:

  cmake -DZINT_TEST=OFF ..

(The tests will now fail to link.)