[TEST] mis_builder: prove non-admins cannot generate reports

Normal users get `AccessError` when trying to preview or print reports.

Tests OCA#415.

@moduon MT-1527

mis_builder/tests/test_mis_report_instance.py

@@ -586,3 +586,7 @@ def test_raise_when_unknown_kpi_value_type(self):
     def test_raise_when_wrong_tuple_length_with_subkpis(self):
         with self.assertRaises(SubKPITupleLengthError):
             self.report_instance_3.compute()
+
+    def test_unprivileged(self):
+        test_user = common.new_test_user(self.env, "mis_you")
+        self.report_instance.with_user(test_user).compute()