Fix tests

pyecore/ecore.py

@@ -709,7 +709,7 @@ def __set__(self, instance, value):
             # if value is not previous_value and isinstance(value, ECollection):
             #     raise AttributeError('Cannot reafect an ECollection with '
             #                          'another one, even if compatible')
-            if isinstance(value, Iterable):
+            if not isinstance(value, str) and isinstance(value, Iterable):
                 previous_value.clear()
                 previous_value.extend(value)
                 return

tests/test_basics.py

@@ -242,13 +242,18 @@ def test_collection_affectation():
     x, y = A(), A()
 
     a = A(name='tes')
-    with pytest.raises(BadValueError):
-        x.toa = [a]
+    # with pytest.raises(BadValueError):
+    col = x.toa
+    x.toa = [a]
+
+    assert x.toa is col
 
     x.toa.append(a)
 
-    with pytest.raises(AttributeError):
-        y.toa = x.toa
+    y.toa = x.toa
+
+    assert y.toa is not x.toa
+    assert x.toa[0] in y.toa
 
     b = A()
     y.toa += [b]