tests: Update tests, and add new ones, for recent generator tweaks.

tests/basics/gen_yield_from_throw2.py

-# uPy differs from CPython for this test
-# generator ignored GeneratorExit
+# generator ignores a thrown GeneratorExit (this is allowed)
+
 def gen():
     try:
         yield 123
@@ -7,9 +7,12 @@ def gen():
         print('GeneratorExit')
     yield 456
         
+# thrown a class
 g = gen()
 print(next(g))
-try:
-    g.throw(GeneratorExit)
-except RuntimeError:
-    print('RuntimeError')
+print(g.throw(GeneratorExit))
+
+# thrown an instance
+g = gen()
+print(next(g))
+print(g.throw(GeneratorExit()))

tests/basics/gen_yield_from_throw2.py.exp

-123
-GeneratorExit
-RuntimeError

tests/basics/gen_yield_from_throw3.py

+# yield-from a user-defined generator with a throw() method
+
+class Iter:
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        return 1
+
+    def throw(self, x):
+        print('throw', x)
+        return 456
+
+def gen():
+    yield from Iter()
+
+# calling close() should not call throw()
+g = gen()
+print(next(g))
+g.close()
+
+# can throw a non-exception object
+g = gen()
+print(next(g))
+print(g.throw(123))
+
+# throwing an exception class just injects that class
+g = gen()
+print(next(g))
+print(g.throw(ZeroDivisionError))

tests/run-tests

@@ -281,7 +281,7 @@ def run_tests(pyb, tests, args):
     # Some tests are known to fail with native emitter
     # Remove them from the below when they work
     if args.emit == 'native':
-        skip_tests.update({'basics/%s.py' % t for t in 'gen_yield_from gen_yield_from_close gen_yield_from_ducktype gen_yield_from_exc gen_yield_from_iter gen_yield_from_send gen_yield_from_stopped gen_yield_from_throw gen_yield_from_throw2 generator1 generator2 generator_args generator_close generator_closure generator_exc generator_return generator_send'.split()}) # require yield
+        skip_tests.update({'basics/%s.py' % t for t in 'gen_yield_from gen_yield_from_close gen_yield_from_ducktype gen_yield_from_exc gen_yield_from_iter gen_yield_from_send gen_yield_from_stopped gen_yield_from_throw gen_yield_from_throw2 gen_yield_from_throw3 generator1 generator2 generator_args generator_close generator_closure generator_exc generator_return generator_send'.split()}) # require yield
         skip_tests.update({'basics/%s.py' % t for t in 'bytes_gen class_store_class globals_del string_join'.split()}) # require yield
         skip_tests.update({'basics/async_%s.py' % t for t in 'def await await2 for for2 with with2'.split()}) # require yield
         skip_tests.update({'basics/%s.py' % t for t in 'try_reraise try_reraise2'.split()}) # require raise_varargs