Running regression tests:
-------------------------

Prerequisites: cmake, python

cd tests
mkdir build
cd build
cmake ..
make
make test


Adding  a new regression test:
------------------------------

1) create a test file at an appropriate location under testdata/
2) if the test is non-obvious, create a human readable description of the test in the same directory (e.g testdata/scad/mytest.txt)
3) if a new test app was written, this must be added to tests/CMakeLists
4) run the test with the environment variable TEST_GENERATE=1, e.g.:
   $ ECAD_GENERATE=1 ctest -R mytest
   (this will generate a mytest-expected.txt file which is used for regression testing)
5) manually verify that the output is correct (test-data/scad/mytest-expected.txt)
6) run the test normally and verify that it passes:
  $ ctest -R mytest

Note that test files which don't have an *-expected.<suffix> file will
be ignored for the test apps in question.