tests/test_invalid.py: add some more invalids

tests/test_invalid.py

@@ -31,3 +31,13 @@ def test_lone_lbrace():
 def test_lone_braces():
 	with pytest.raises(ParseException):
 		loads_xbc('{}')
+
+def test_lone_semi():
+	with pytest.raises(ParseException):
+		loads_xbc(';')
+
+def test_empty():
+	with pytest.raises(ParseException):
+		loads_xbc('\n')
+	with pytest.raises(ParseException):
+		loads_xbc('')