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tests/README: Explain how tests get skipped

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1 parent 0d6b234 commit 04fffe6562e01522cc086b877080b0efb9481327 @altasoul altasoul committed with pfalcon Sep 15, 2015
Showing with 13 additions and 3 deletions.
  1. +13 −3 tests/README
@@ -1,7 +1,17 @@
This directory contains tests for various functionality areas of MicroPython.
-To run all stable tests, run "run-tests" script in this directory. Note
-that bytecode tests are not yet stable and should be run separately in
-"bytecode" subdirectory.
+To run all stable tests, run "run-tests" script in this directory.
+Tests of capabilities not supported on all platforms should be written
+to check for the capability being present. If it is not, the test
+should merely output 'SKIP' followed by the line terminator, and call
+sys.exit() to raise SystemExit, instead of attempting to test the
+missing capability. The testing framework (run-tests in this
+directory, test_main.c in qemu_arm) recognizes this as a skipped test.
+There are a few features for which this mechanism cannot be used to
+condition a test. The run-tests script uses small scripts in the
+feature_check directory to check whether each such feature is present,
+and skips the relevant tests if not.
When creating new tests, anything that relies on float support should go in the
float/ subdirectory. Anything that relies on import x, where x is not a built-in

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