further work on supporting single and multiple fstring decompilation

pytest/test_fstring.py

@@ -21,9 +21,13 @@ def expressions(draw):
         'container',
         'self.attribute',
         'self.method()',
+        # These expressions are failing, I think these are control
+        # flow problems rather than problems with FORMAT_VALUE,
+        # however I need to confirm this...
         #'sorted(items, key=lambda x: x.name)',
         #'func(*args, **kwargs)',
         #'text or default',
+        #'43 if life_the_universe and everything else None'
     )))
 
 
@@ -119,6 +123,8 @@ def test_format_specifiers(format_specifier):
 
 
 def run_test(text):
+    hypothesis.assume(len(text))
+    hypothesis.assume("f'{" in text)
     expr = text + '\n'
     code = compile(expr, '<string>', 'single')
     deparsed = deparse_code(PYTHON_VERSION, code, compile_mode='single')