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+Running the tests
+-----------------
+
+- All tests reside in the tests/ directory tree.
+
+- Running the tests is as simple as:
+    $ ctest
+
+- Alternatively, the test scripts can be run directly:
+    $ cd tests
+    $ ./run_format_tests.py
+
+- To run the only the tests associated with language X ("cpp", "java", etc.):
+    $ cd tests
+    $ ./run_format_tests.py X
+
+Adding new tests
+----------------
+
+- A test is defined by adding a line in one of the tests/*.test
+  files: you must pick the .test file for the proper programming
+  language, i.e. pick the X.test file which defines tests which use
+  inputs in language X.
+
+- A test has a (unique) number (a.k.a. test name) -- it does not have
+  to be a sequential number, but it might be handy to treat it like
+  that.
+
+- The X.test entry (line) has this format:
+
+    <test.name> <config.file> <input.file>
+
+  where the fields are separated by an arbitrary non-zero amount of
+  whitespace.
+
+- As each test references a config file and an input file (the latter
+  written in programming language X), these are assumed to exist in
+  the paths tests/config/<config.file> and tests/<input.file>
+  respectively. It is _strongly_ advised to put input files in their
+  own subdirectory, so a 'C' source formatting test entry might look
+  like this (in 'c.test'):
+
+    99902 ger-full-cmt-reflow.cfg c/cmt-not-a-boxed-cmt.c
+
+  where 'ger-full-cmt-reflow.cfg' is stored at
+  tests/config/ger-full-cmt-reflow.cfg and 'c/cmt-not-a-boxed-cmt.c'
+  will be fetched from tests/c/cmt-not-a-boxed-cmt.c when you run
+  the tests.
+  
+
+Features
+--------
+
+- You can re-use config files and input files for multiple tests. So
+  one might observe test sets like these:
+
+  # clark's style - blank lines before and after flow control,
+  indented comments:
+  
+    20100 clark.cfg c/i2c-core.c
+    20101 clark.cfg c/comment-indent.c
+    20102 clark.cfg c/indent.cpp
+    20103 clark.cfg c/output.cpp
+
+  and
+
+    21051 return-1.cfg c/nl_return_expr.c
+    21052 return-2.cfg c/nl_return_expr.c
+    21053 return-3.cfg c/nl_return_expr.c
+    21054 return-4.cfg c/nl_return_expr.c
+
+- Reference output files (the reference against which the uncrustify
+  test run output is compared) are to be stored in the path
+  tests/expected/<X>/<NNN-TTTTT.TTT> where <X> is the 'language
+  directory' part of the input file, e.g. 'c' for input file
+  'c/nl_return_expr.c', <NNN> is the test name (number), e.g. '21051',
+  and <TTTTT.TTT> is the file name part of the input test filespec,
+  e.g. 'nl_return_expr.c' for input file spec 'c/nl_return_expr.c'.
+
+  This means that for test
+
+    21051 return-1.cfg c/nl_return_expr.c
+
+  the accompanying reference output is:
+
+    tests/expected/c/21051-nl_return_expr.c
+
+- When starting out with a new test, you don't need to have a
+  'reference output' yet: the test will simply be reported as a
+  'fail'ed test until you do.
+
+- Tip: the easiest way to produce 'reference output' is to copy the
+  test output (from tests/results/...etc... ) to
+  tests/expected/...etc... once you've ascertained that those tests
+  produce the desired (correct) output. The helper script
+  tests/fixtest.sh will copy the results file to the output folder:
+
+    $ fixtest.sh 30014 00110  # copy tests 30014 and 00110
+
+- Tip: the helper script tests/difftest.sh runs 'diff' on the result
+  and output versions to point out what changed.
+
+- Tip: There are also a few options to run_format_tests.py that can
+  help. Most interesting is '-d' will run 'diff' if the test fails.
+
+- Tip: If some errors occur with Windows, set the macro variable
+  NO_MACRO_VARARG to 1 to test some more pointer under Linux.