While it is tried to have the complete test suite covered by both the build
time tests and the opescad-testrun script, not all pass and are documented
here. (Syntax: test name substring / substring list to match or generic
description, R in parentheses indicates failure in openscad-testrun, B in
parentheses indicates failure at build time).

* echotest_include-overwrite-main, echotest_errors-warnings-included (R): They
  fail because they check program output against expected output, this output
  contains (relative) file paths, and those relative paths are different when
  using openscad-testrun.
* tesselation (R): The test suite relies on a particular implementation of the
  Liberation Sans font; they ship it, but it is not included in the Debian
  package because it is prefered to rely on the system's fonts.
* issue1165, issue1215 (RB): There appears to be Z-fighting in the both the
  expected and the actual image, but that can't be expected to be reliable. See
  https://github.com/openscad/openscad/issues/1412 .
* throwntogethertest_issue1089, openscad-cameyeortho_camera-tests,
  openscad-cameyeortho-viewall_camera-tests (RB): seem to just fail with the
  software renderer. See https://github.com/openscad/openscad/issues/1413 .
* 3mfpngtest_cube10, 3mfexport_3mf-export (RB): These fail on big-endian
  machines due to a bug in the code in lib3mf that exports a .3mf file:
  https://github.com/3MFConsortium/lib3mf/issues/160

The tests marked with B are explicitly excluded in debian/rules to make things
build without a general "Some tests are expected to fail, continuing anyway"
exception.

Tests can be explicitly excluded from openscad-testrun by passing it
"-- --exclude-regex PATTERN". If no --exclude-regex is specified like
this, a default pattern is used that matches a few testcases that are
known not to be able to work, as described above.
