Add more f-string tests.

test/test_fstring.py

@@ -1,6 +1,6 @@
 import pytest
 
-from parso import load_grammar
+from parso import load_grammar, ParserSyntaxError
 
 
 @pytest.fixture
@@ -16,9 +16,38 @@ def grammar():
         '{1!a:1}',
         '{1:1}',
         '{1:1.{32}}',
+        '{1::>4}',
+        '{foo} {bar}',
+
+        # Invalid, but will be checked, later.
+        '{}',
+        '{1:}',
+        '{:}',
+        '{:1}',
+        '{!:}',
+        '{!}',
+        '{!a}',
+        '{1:{}}',
+        '{1:{:}}',
     ]
 )
 def test_valid(code, grammar):
     fstring = grammar.parse(code, error_recovery=False)
     assert fstring.type == 'fstring'
     assert fstring.get_code() == code
+
+
+@pytest.mark.parametrize(
+    'code', [
+        '}',
+        '{',
+        '{1!{a}}',
+        '{!{a}}',
+    ]
+)
+def test_invalid(code, grammar):
+    with pytest.raises(ParserSyntaxError):
+        grammar.parse(code, error_recovery=False)
+
+    # It should work with error recovery.
+    grammar.parse(code, error_recovery=True)