Overhaul test suite

[jgm]

The test suite is a complicated mess, and it's hard to add new tests.

• Reorganize it for simplicity
• Consider using tasty-golden
• Add documentation on adding tests
• Consider adding a benchmark suite with tasty-bench

[jgm]

Notes on the current test suite:

Directory structure:

• tests
  • writers (contains .tex .omml .mml .eqn) (used as golden files for writer tests)
  • readers (used as golden files for reader tests, and as sources for writer tests and round-trip tests)
    • mml (contains .native)
    • tex (contains .native)
    • omml (contains .native)
  • src (contains .mml .tex) (used as input for reader tests)

I think one of the things that makes the test suite hard to modify is that the same files are used as golden files for reader tests and as sources for writer tests... (tests/readers)

Standard tests:

• runReader on all readers (tex, mml, omml)

  • compares result of converting input src/%.EXT to the result in readers/EXT/%.native where EXT depends on reader
  • if --regenerate-tests, then regenerate this output file

• runWriter on all writers (tex, mml, omml, eqn) - currently pandoc writer is not tested

  • for sources, uses both readers/mml/%.native and readers/tex/%.native
  • converts these and compares to results in writers/%.EXT where EXT depends on the writer
  • if --regenerate-tests, then regenerate the golden file

Optional round-trip (with --round-trip), for tex, mml, omml:

• convert readers/EXT/%.native using the specified writer, then use the reader to convert back to native, and compare to the original

[jgm]

fmt=omml ; mkdir -p test/reader/$fmt;  for x in tests/src/*.$fmt; do out=test/reader/$fmt/${$(basename $x)%.$fmt} ; echo "Creating $out"; echo "<<< $fmt" >$out ; cat $x >>$out; echo >>$out ;  echo ">>> native" >>$out ; ppsh < tests/readers/$fmt/${$(basename $x)%.$fmt}.native >>$out ; done

fmt=tex ; mkdir -p test/writer/$fmt;  for x in tests/readers/mml/*.native tests/readers/tex/*.native ; do out=test/writer/$fmt/${$(basename $x)%.$fmt} ; echo "Creating $out"; echo "<<< native" >$out ; ppsh < $x >>$out;  echo ">>> $fmt" >>$out ; cat tests/writers/${$(basename x)%.native}.$fmt >>$out ; done