Fix test

sylee957 · sylee957 · commit e24d30dcec5b · 2020-04-30T07:58:45.000+09:00
diff --git a/sympy/matrices/tests/test_immutable.py b/sympy/matrices/tests/test_immutable.py
@@ -21,7 +21,8 @@ def test_creation():
 def test_immutability():
     with raises(TypeError):
         IM[2, 2] = 5
-        ISM[2, 2]
+    with raises(TypeError):
+        ISM[2, 2] = 5
 
 
 def test_slicing():
