[Swift-devel] language parser regression tests

[Ben Clifford]

In r598 I committed a bunch of regression tests for the language parser.

There are two sets of tests:
 
The first set consists of a number of swift text source files and 
corresponding expected XML intermediate form files. When the tests run, 
they check that the input files produce the expected output files. I'll 
probably extend this to have expected .kml files too.

The second set consists of swift source text that should not compile. The 
tests pass when the compiler reports an error compiling, and fails if the 
compiler reports successful compilation. As there is no expected XML/KML 
output, these tests do not have expected-xml files.

The tests are not run in the nighly build at the moment, though I should 
probably make that so.

These tests something to be aware of if modifying the parser/compiler 
code.

To run them at the moment, 

  cd tests/language
  ./run

with the swift bin directory on the path.

To add tests, put a .dtm file in working/ (I should rename those to 
.swift) and the expected xml file in working-base/   or put a broken .dtm 
file in not-working/  (depending on whether you want the first or second 
kind of test mentioned above)

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