diff --git a/mis_builder/models/mis_report_instance.py b/mis_builder/models/mis_report_instance.py
index 935f8efe6..1c8cc3af3 100644
--- a/mis_builder/models/mis_report_instance.py
+++ b/mis_builder/models/mis_report_instance.py
@@ -332,8 +332,7 @@ def _get_additional_move_line_filter(self):
         Returns an Odoo domain expression (a python list)
         compatible with account.move.line."""
         self.ensure_one()
-        filters = self._get_filter_domain_from_context()
-        return filters
+        return self._get_filter_domain_from_context()
 
     @api.multi
     def _get_additional_query_filter(self, query):
diff --git a/mis_builder/pyproject.toml b/mis_builder/pyproject.toml
index 7ef453a20..2d560e05f 100644
--- a/mis_builder/pyproject.toml
+++ b/mis_builder/pyproject.toml
@@ -5,3 +5,6 @@
     issue_format = "`#{issue} <https://github.com/oca/mis-builder/issues/{issue}>`_"
     directory = "readme/newsfragments"
     filename = "readme/HISTORY.rst"
+
+[tool.black]
+    line-length=79
diff --git a/mis_builder/tests/__init__.py b/mis_builder/tests/__init__.py
index c39ffac02..13cac9c0e 100644
--- a/mis_builder/tests/__init__.py
+++ b/mis_builder/tests/__init__.py
@@ -3,6 +3,7 @@
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
 
 from . import test_accounting_none
+from . import test_analytic_filters
 from . import test_aep
 from . import test_multi_company_aep
 from . import test_aggregate
diff --git a/mis_builder/tests/test_analytic_filters.py b/mis_builder/tests/test_analytic_filters.py
new file mode 100644
index 000000000..a8cd5b161
--- /dev/null
+++ b/mis_builder/tests/test_analytic_filters.py
@@ -0,0 +1,52 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 ACSONE SA/NV (<http://acsone.eu>)
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
+
+from odoo.tests.common import TransactionCase
+
+
+class TestAnalyticFilters(TransactionCase):
+    def test_context_with_filters(self):
+        aaa = self.env["account.analytic.account"].search([], limit=1)
+        mri = self.env["mis.report.instance"].new()
+        mri.analytic_account_id = False
+        assert mri._context_with_filters().get("mis_report_filters") == {}
+        mri.analytic_account_id = aaa
+        assert mri._context_with_filters().get("mis_report_filters") == {
+            "analytic_account_id": {"value": aaa.id}
+        }
+        # test _context_with_filters does nothing is a filter is already
+        # in the context
+        mri.with_context(
+            mis_report_filters={"f": 1}
+        )._context_with_filters().get("mis_report_filters") == {"f": 1}
+
+    def _check_get_filter_domain_from_context(
+        self, mis_report_filters, expected_domain
+    ):
+        domain = (
+            self.env["mis.report.instance.period"]
+            .with_context(mis_report_filters=mis_report_filters)
+            ._get_filter_domain_from_context()
+        )
+        assert domain == expected_domain
+
+    def test_get_filter_domain_from_context_1(self):
+        # no filter, no domain
+        self._check_get_filter_domain_from_context({}, [])
+        # the most basic analytic account filter (default operator is =)
+        self._check_get_filter_domain_from_context(
+            {"analytic_account_id": {"value": 1}},
+            [("analytic_account_id", "=", 1)],
+        )
+        # custom operator
+        self._check_get_filter_domain_from_context(
+            {"analytic_account_id": {"value": 1, "operator": "!="}},
+            [("analytic_account_id", "!=", 1)],
+        )
+        # any field name works
+        self._check_get_filter_domain_from_context(
+            {"some_field": {"value": "x"}}, [("some_field", "=", "x")]
+        )
+        # filter name without value => no domain
+        self._check_get_filter_domain_from_context({"some_field": None}, [])