Avoid asserts which could happen when converting a non-ASCII character
to char by representing such characters as hex escapes too, as we
already did for non-printable characters.
This gives correct error messages for expressions involving strings
instead of "unexpected exception" due to a failing assert in wxUniChar
char conversion operator.
Use Catch2 public header instead of using internal Catch v1 headers: we
can do this now because Catch2 supports (albeit in a rather ugly way)
being used with PCH.
Show non-printable characters when comparing strings more clearly if the
comparison fails, this is notably useful for strings containing NULs as
they were previously completely lost.
The variables and helper TempStringAssign class were added in order to
implement this, but somehow it was never done, so wxGetCurrentTestName()
always returned an empty string.
Fix this and so store the class/method name of the currently running
test in the global variables to give more context, notably for GTK+
errors.
It doesn't really add anything and it's more convenient to specify the
section on the command line (using the "-c" option) if it's just a
single word, without spaces, as it doesn't need to be quoted then.
Drop the legacy CppUnit testing framework used for the unit tests.
Replacing it with Catch has the advantage of not requiring CppUnit
libraries to be installed on the system in order to be able to run
tests (Catch is header-only and a copy of it is now included in the
main repository itself) and, in the future, of being able to write
the tests in a much more natural way.
For now, however, avoid changing the existing tests code as much as
[reasonably] possible to avoid introducing bugs in them and provide
the CppUnit compatibility macros in the new wx/catch_cppunit.h header
which allow to preserve the 99% of the existing code unchanged. Some
of the required changes are:
- Decompose asserts using "a && b" conditions into multiple asserts
checking "a" and "b" independently. This would have been better
even with CppUnit (to know which part of condition exactly failed)
and is required with Catch.
- Use extra parentheses around such conditions when they can't be
easily decomposed in the arrays test, due to the use of macros.
This is not ideal from the point of view of messages given when
the tests fail but will do for now.
- Rewrite asserts using "a || b" as a combination of condition
checks and assert macros. Again, this is better anyhow, and is
required with Catch. Incidentally, this allowed to fix a bug in
the "exec" unit test which didn't leave enough time for the new
process to be launched before trying to kill it.
- Remove multiple CPPUNIT_TEST_SUITE_NAMED_REGISTRATION() macros,
our emulation of this macro can be used only once.
- Provide string conversions using Catch-specific StringMaker for
a couple of types.
- Replace custom wxImage comparison with a Catch-specific matcher
class.
- Remove most of test running logic from test.cpp, in particular don't
parse command line ourselves any longer but use Catch built-in
command line parser. This is a source of a minor regression:
previously, both "Foo" and "FooTestCase" could be used as the name of
the test to run, but now only the latter is accepted.
