[IMP] report_xlsx: test performance improvement

- Switch to setUpClass for avoiding repeat the same setup for each test.
- Include context keys for avoiding mail operations overhead.

report_xlsx/tests/test_report.py

@@ -14,15 +14,26 @@ except ImportError:
 
 
 class TestReport(common.TransactionCase):
-    def setUp(self):
-        super().setUp()
-        report_object = self.env["ir.actions.report"]
-        self.xlsx_report = self.env["report.report_xlsx.abstract"].with_context(
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        # Remove this variable in v16 and put instead:
+        # from odoo.addons.base.tests.common import DISABLED_MAIL_CONTEXT
+        DISABLED_MAIL_CONTEXT = {
+            "tracking_disable": True,
+            "mail_create_nolog": True,
+            "mail_create_nosubscribe": True,
+            "mail_notrack": True,
+            "no_reset_password": True,
+        }
+        cls.env = cls.env(context=dict(cls.env.context, **DISABLED_MAIL_CONTEXT))
+        report_object = cls.env["ir.actions.report"]
+        cls.xlsx_report = cls.env["report.report_xlsx.abstract"].with_context(
             active_model="res.partner"
         )
-        self.report_name = "report_xlsx.partner_xlsx"
-        self.report = report_object._get_report_from_name(self.report_name)
-        self.docs = self.env["res.company"].search([], limit=1).partner_id
+        cls.report_name = "report_xlsx.partner_xlsx"
+        cls.report = report_object._get_report_from_name(cls.report_name)
+        cls.docs = cls.env["res.company"].search([], limit=1).partner_id
 
     def test_report(self):
         report = self.report