diff --git a/fusion_centralize_billing/tests/test_invoice_ledger.py b/fusion_centralize_billing/tests/test_invoice_ledger.py
index c2f4fe29..3d2a7494 100644
--- a/fusion_centralize_billing/tests/test_invoice_ledger.py
+++ b/fusion_centralize_billing/tests/test_invoice_ledger.py
@@ -18,11 +18,26 @@ def _inv_fixture():
     }]
 
 
+def _fc_ensure_ca_billing_env(env):
+    """Prod (`nexamain`) is a fully-configured Canadian company; a bare test DB is not.
+    Give it the two things the ledger needs: an active CAD currency and a 13% sale tax
+    matching invoice.ledger.wizard._fc_tax_for (type_tax_use=sale, percent, amount=13)."""
+    cad = env.ref('base.CAD')
+    if not cad.active:
+        cad.sudo().write({'active': True})
+    Tax = env['account.tax'].sudo()
+    if not Tax.search([('type_tax_use', '=', 'sale'),
+                       ('amount_type', '=', 'percent'), ('amount', '=', 13.0)], limit=1):
+        Tax.create({'name': 'HST 13%', 'type_tax_use': 'sale',
+                    'amount_type': 'percent', 'amount': 13.0})
+
+
 @tagged('post_install', '-at_install')
 class TestLedgerFamily(TransactionCase):
 
     def setUp(self):
         super().setUp()
+        _fc_ensure_ca_billing_env(self.env)
         self.W = self.env['fusion.billing.invoice.ledger.wizard'].sudo()
 
     def test_family_classification(self):
@@ -47,6 +62,7 @@ class TestLedgerTax(TransactionCase):
 
     def setUp(self):
         super().setUp()
+        _fc_ensure_ca_billing_env(self.env)
         self.W = self.env['fusion.billing.invoice.ledger.wizard'].sudo()
 
     def test_tax_for_13pct_is_a_13_percent_sale_tax(self):
@@ -68,6 +84,7 @@ class TestLedgerIngest(TransactionCase):
 
     def setUp(self):
         super().setUp()
+        _fc_ensure_ca_billing_env(self.env)
         self.W = self.env['fusion.billing.invoice.ledger.wizard'].sudo()
         self.Move = self.env['account.move']
 
@@ -174,6 +191,7 @@ class TestLedgerVerifiedSync(TransactionCase):
 
     def setUp(self):
         super().setUp()
+        _fc_ensure_ca_billing_env(self.env)
         self.W = self.env['fusion.billing.invoice.ledger.wizard'].sudo()
         self.Move = self.env['account.move']
         ICP = self.env['ir.config_parameter'].sudo()
diff --git a/fusion_centralize_billing/tests/test_usage.py b/fusion_centralize_billing/tests/test_usage.py
index c31db95b..020d573e 100644
--- a/fusion_centralize_billing/tests/test_usage.py
+++ b/fusion_centralize_billing/tests/test_usage.py
@@ -9,7 +9,8 @@ class TestRatingCron(TransactionCase):
 
     def setUp(self):
         super().setUp()
-        self.metric = self.env['fusion.billing.metric'].sudo().create(
+        Metric = self.env['fusion.billing.metric'].sudo()
+        self.metric = Metric.search([('code', '=', 'cpu_seconds')], limit=1) or Metric.create(
             {'name': 'CPU seconds', 'code': 'cpu_seconds', 'aggregation': 'sum'})
         self.plan_a = self.env['sale.subscription.plan'].sudo().create(
             {'name': 'Plan A', 'billing_period_value': 1, 'billing_period_unit': 'month'})
@@ -67,7 +68,8 @@ class TestUsageIngestion(TransactionCase):
 
     def setUp(self):
         super().setUp()
-        self.metric = self.env['fusion.billing.metric'].sudo().create(
+        Metric = self.env['fusion.billing.metric'].sudo()
+        self.metric = Metric.search([('code', '=', 'cpu_seconds')], limit=1) or Metric.create(
             {'name': 'CPU seconds', 'code': 'cpu_seconds', 'aggregation': 'sum'})
         self.plan = self.env['sale.subscription.plan'].sudo().create(
             {'name': 'Monthly', 'billing_period_value': 1, 'billing_period_unit': 'month'})
diff --git a/fusion_centralize_billing/tests/test_webhook.py b/fusion_centralize_billing/tests/test_webhook.py
index 38e73cab..b8710123 100644
--- a/fusion_centralize_billing/tests/test_webhook.py
+++ b/fusion_centralize_billing/tests/test_webhook.py
@@ -13,11 +13,17 @@ class TestWebhookEngine(TransactionCase):
 
     def setUp(self):
         super().setUp()
-        self.service = self.env['fusion.billing.service'].sudo().create({
+        Service = self.env['fusion.billing.service'].sudo()
+        vals = {
             'name': 'NexaCloud', 'code': 'nexacloud',
             'webhook_url': 'https://api.vps.nexasystems.ca/billing/webhook',
             'webhook_secret': 'whsec_test',
-        })
+        }
+        self.service = Service.search([('code', '=', 'nexacloud')], limit=1)
+        if self.service:
+            self.service.write(vals)
+        else:
+            self.service = Service.create(vals)
         self.Webhook = self.env['fusion.billing.webhook'].sudo()
 
     def test_enqueue_signs_payload(self):