Fix pytest.raises in tests

Author: lovelydinosaur

tests/test_importer.py

@@ -4,28 +4,28 @@
 
 
 def test_invalid_format():
-    with pytest.raises(ImportFromStringError) as exc:
+    with pytest.raises(ImportFromStringError) as exc_info:
         import_from_string("example:")
     expected = 'Import string "example:" must be in format "<module>:<attribute>".'
-    assert expected in str(exc)
+    assert expected in str(exc_info.value)
 
 
 def test_invalid_module():
-    with pytest.raises(ImportFromStringError) as exc:
+    with pytest.raises(ImportFromStringError) as exc_info:
         import_from_string("module_does_not_exist:myattr")
     expected = 'Could not import module "module_does_not_exist".'
-    assert expected in str(exc)
+    assert expected in str(exc_info.value)
 
 
 def test_invalid_attr():
-    with pytest.raises(ImportFromStringError) as exc:
+    with pytest.raises(ImportFromStringError) as exc_info:
         import_from_string("tempfile:attr_does_not_exist")
     expected = 'Attribute "attr_does_not_exist" not found in module "tempfile".'
-    assert expected in str(exc)
+    assert expected in str(exc_info.value)
 
 
 def test_internal_import_error():
-    with pytest.raises(ImportError) as exc:
+    with pytest.raises(ImportError):
         import_from_string("tests.importer.raise_import_error:myattr")