diff --git a/tests/test_caluire_axel_schema.py b/tests/test_caluire_axel_schema.py
index 2c392bfd..01d2d2e3 100644
--- a/tests/test_caluire_axel_schema.py
+++ b/tests/test_caluire_axel_schema.py
@@ -69,12 +69,14 @@ def test_bool_mapping(bool_type, value, expected, py_expected):
     )
 
     schema = CaluireAxelSchema(xsd, 'PORTAIL')
-    xml_data = schema.encode({'PORTAIL': {'BOOL': value}})
-    assert xml_data.find('BOOL').text == expected
 
     if py_expected is None:
         with pytest.raises(xmlschema.XMLSchemaValidationError):
+            xml_data = schema.encode({'PORTAIL': {'BOOL': value}})
+            assert xml_data.find('BOOL').text == expected
             schema.decode(xml_data)
     else:
+        xml_data = schema.encode({'PORTAIL': {'BOOL': value}})
+        assert xml_data.find('BOOL').text == expected
         json_data = schema.decode(xml_data)
         assert json_data['BOOL'] is py_expected
diff --git a/tests/test_toulouse_axel_schema.py b/tests/test_toulouse_axel_schema.py
index 67c8e1ae..d955559f 100644
--- a/tests/test_toulouse_axel_schema.py
+++ b/tests/test_toulouse_axel_schema.py
@@ -48,10 +48,9 @@ def test_date_mapping(date_type):
     json_data = schema.decode(xml_data)
     assert json_data['DATE'] == '2019-12-12'
 
-    xml_data = schema.encode({'PORTAIL': {'DATE': 'foobar'}})
-    assert xml_data.find('DATE').text == 'foobar'
-
     with pytest.raises(xmlschema.XMLSchemaValidationError):
+        xml_data = schema.encode({'PORTAIL': {'DATE': 'foobar'}})
+        assert xml_data.find('DATE').text == 'foobar'
         schema.decode(xml_data)
 
     if date_type == 'DATEType':
@@ -107,12 +106,14 @@ def test_bool_mapping(bool_type, value, expected, py_expected):
     )
 
     schema = AxelSchema(xsd, 'PORTAIL')
-    xml_data = schema.encode({'PORTAIL': {'BOOL': value}})
-    assert xml_data.find('BOOL').text == expected
 
     if py_expected is None:
         with pytest.raises(xmlschema.XMLSchemaValidationError):
+            xml_data = schema.encode({'PORTAIL': {'BOOL': value}})
+            assert xml_data.find('BOOL').text == expected
             schema.decode(xml_data)
     else:
+        xml_data = schema.encode({'PORTAIL': {'BOOL': value}})
+        assert xml_data.find('BOOL').text == expected
         json_data = schema.decode(xml_data)
         assert json_data['BOOL'] is py_expected