chore: added unit test

Author: josetapadas

test-data/unit/check-async-await.test

@@ -1013,13 +1013,15 @@ async def foo(x: int) -> int: ...
 
 # These are allowed in some cases:
 top_level = await foo(1)  # E: "await" outside function  [top-level-await]
-crasher = [await foo(x) for x in [1, 2, 3]]  # E: "await" outside function  [top-level-await]
+crasher = [await foo(x) for x in [1, 2, 3]]  # E: "async for" outside async function  [syntax] \
+                                             # E: "await" outside function  [top-level-await]
 
 def bad() -> None:
     # These are always critical / syntax issues:
-    y = [await foo(x) for x in [1, 2, 3]]  # E: "await" outside coroutine ("async def")  [await-not-async]
+    y = [await foo(x) for x in [1, 2, 3]]  # E: "async for" outside async function  [syntax]
 async def good() -> None:
     y = [await foo(x) for x in [1, 2, 3]]  # OK
+
 [builtins fixtures/async_await.pyi]
 [typing fixtures/typing-async.pyi]
 
@@ -1080,3 +1082,13 @@ class Launcher(P):
 
 [builtins fixtures/async_await.pyi]
 [typing fixtures/typing-async.pyi]
+
+[case testAwaitInsideGeneratorExpr]
+def foo():
+    yield 0
+
+def bar():
+    (await x for x in foo())
+
+[builtins fixtures/async_await.pyi]
+[typing fixtures/typing-async.pyi]