fix iexpr test

Author: Jaquier Aurélien Tristan

bluepyopt/tests/test_ephys/test_parameterscalers.py

@@ -175,12 +175,16 @@ def test_parameterscalers_iexpr():
             f.write(simple_cell_decor_with_iexpr)
         test_decor = arbor.load_component(decor_filename).component
         assert test_decor.defaults() == []
-        assert str(test_decor.paintings()) == \
-            """[('(region "soma")', Cm=0.01), """ \
-            """('(region "soma")', <arbor.scaled_mechanism<density> """ \
-            "(mechanism('default::hh', " \
-            '{"gkbar": 0.0271248, "gnabar": 0.102993}), ' \
+        assert test_decor.placements() == []
+        assert len(test_decor.paintings()) == 2
+        assert test_decor.paintings()[0][0] == '(region "soma")'
+        assert str(test_decor.paintings()[0][1]) == 'Cm=0.01'
+        assert test_decor.paintings()[1][0] == '(region "soma")'
+        scaled_mech_str = "<arbor.scaled_mechanism<density> " \
+            "(mechanism('default::hh', %s), " \
             '{"gkbar": (sub (scalar 0.621094) (mul (log (scalar 3.14159)) ' \
             '(exp (div (distance 1 (region "soma")) ' \
-            '(scalar 0.421875)))))})>)]'
-        assert test_decor.placements() == []
+            '(scalar 0.421875)))))})>'
+        str1 = scaled_mech_str % '{"gkbar": 0.0271248, "gnabar": 0.102993}'
+        str2 = scaled_mech_str % '{"gnabar": 0.102993, "gkbar": 0.0271248}'
+        assert str(test_decor.paintings()[1][1]) in [str1, str2]