hy/tests/native_tests/py3_only_tests.hy

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;; Tests where the emited code relies on Python 3.
;; Conditionally included in nosetests runs.
(import [hy._compat [PY33]])
(import [hy.errors [HyCompileError]])
(defn test-yield-from []
"NATIVE: testing yield from"
(try
(eval
'(do (defn yield-from-test []
(for* [i (range 3)]
(yield i))
(yield-from [1 2 3]))
(assert (= (list (yield-from-test)) [0 1 2 1 2 3]))))
(catch [e HyCompileError]
;; Yield-from is supported in py3.3+ only
(assert (not PY33)))
(else (assert PY33))))
(defn test-exception-cause []
(try (raise ValueError :from NameError)
(except [e [ValueError]]
(assert (= (type (. e __cause__)) NameError)))))