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guile/test-suite
Andy Wingo 02ebea537f peval: simpler and more precise treatment of mutability
* module/language/tree-il/optimize.scm (peval): The old approach of
  optimistically producing constants and then de-constifying them at
  their uses was not only cumbersome but incorrect: it both failed to
  preserve identity in some cases and failed to retain immutable
  constant values.  Instead, now we only produce constants if they
  really are constant and immutable.  The constant folder has to have a
  few more algebraic cases to be as effective as it was, to destructure
  (car (cons _ _)) appropriately.  On the plus side, now constructors
  and deconstructors can handle impure cases more generally.

* test-suite/tests/tree-il.test ("partial evaluation"): Add constructor
  and destructuring tests.  Adapt other tests to new expectations.
2011-09-25 02:54:45 +02:00
..
lalr Add Boucher's lalr-scm' as the (system base lalr)' module. 2010-03-31 00:41:59 +02:00
standalone fix scm_to_latin1_stringn for substrings 2011-09-10 11:38:25 -07:00
tests peval: simpler and more precise treatment of mutability 2011-09-25 02:54:45 +02:00
vm Update (ice-9 match) from Chibi-Scheme. 2011-09-03 22:18:02 +02:00
ChangeLog-2008 Rename ChangeLog' files to ChangeLog-2008'. 2008-09-12 21:49:58 +02:00
guile-test make guile-test work without configuration 2010-12-07 13:21:00 +01:00
lib.scm Misc textual editing 2011-02-13 22:13:33 +00:00
Makefile.am Update (ice-9 match) from Chibi-Scheme. 2011-09-03 22:18:02 +02:00
README Revert "Note need for subscription to bug-guile@gnu.org." 2008-12-10 19:07:14 +00:00

This directory contains some tests for Guile, and some generic test
support code.

To run these tests, you will need a version of Guile more recent than
15 Feb 1999 --- the tests use the (ice-9 and-let*) and (ice-9
getopt-long) modules, which were added to Guile around then.

For information about how to run the test suite, read the usage
instructions in the comments at the top of the guile-test script.

You can reference the file `lib.scm' from your own code as the module
(test-suite lib); it also has comments at the top and before each
function explaining what's going on.

Please write more Guile tests, and send them to bug-guile@gnu.org.
We'll merge them into the distribution.  All test suites must be
licensed for our use under the GPL, but I don't think I'm going to
collect assignment papers for them.



Some test suite philosophy:

GDB has an extensive test suite --- around 6300 tests.  Every time the
test suite catches a bug, it's great.

GDB is so complicated that folks are often unable to get a solid
understanding of the code before making a change --- we just don't
have time.  You'll see people say things like, "Here's a fix for X; it
doesn't cause any regressions."  The subtext is, I made a change that
looks reasonable, and the test suite didn't complain, so it must be
okay.

I think this is terrible, because it suggests that the writer is using
the test suite as a substitute for having a rock-solid explanation of
why their changes are correct.  The problem is that any test suite is
woefully incomplete.  Diligent reasoning about code can catch corner
conditions or limitations that no test suite will ever find.



Jim's rule for test suites:

Every test suite failure should be a complete, mysterious surprise,
never a possibility you were prepared for.  Any other attitude
indicates that you're using the test suite as a crutch, which you need
only because your understanding is weak.