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+This directory contains the test cases.
+
+Each test must have a filename of the form: ``t*.nim``
+
+**Note:** [Testament](https://nim-lang.github.io/Nim/testament.html) is only aware of tests under a directory (eg `tests/foo/`) and will ignore
+top-level tests like `tests/tbar.nim`.
+
+# Specs
+
+Each test can contain a spec in a ``discard """ ... """`` block.
+
+**Check out the [``parseSpec`` procedure](https://github.com/nim-lang/Nim/blob/devel/testament/specs.nim#L315) in the ``specs`` module for a full and reliable reference**
+
+## action
+
+Specifies what action this test should take.
+
+**Default: run**
+
+Options:
+
+* ``compile`` - compiles the module and fails the test if compilations fails.
+* ``run`` - compiles and runs the module, fails the test if compilation or
+            execution of test code fails.
+* ``reject`` - compiles the module and fails the test if compilation succeeds.
+
+There are certain spec keys that imply ``run``, including ``output`` and
+``outputsub``.
+
+# Categories
+
+Each folder under this directory represents a test category, which can be
+tested by running `koch tests pcat <category>` (or `cat` to avoid parallel
+testing, which is slower).
+
+The folder ``dll`` contains simple DLL tests.
+
+The folder ``realtimeGC`` contains a test for validating that the realtime GC
+can run properly without linking against the nimrtl.dll/so.