fix: honor tenant validation during plugin imports

tests/test_importer_plugin_compat.py

@@ -0,0 +1,55 @@
+from django.db import models
+
+from netbox_export.services.importer import _field_kwargs
+from netbox_export.services.references import ReferenceResolver
+
+
+class Tenant(models.Model):
+    class Meta:
+        app_label = "tenancy"
+
+
+class TenantManagedObject(models.Model):
+    tenant = models.ForeignKey(Tenant, on_delete=models.PROTECT, null=True)
+
+    class Meta:
+        app_label = "compat_tests"
+
+
+def tenant_record():
+    return {
+        "fields": {},
+        "relations": {"tenant": {"ref": "tenancy.tenant:23"}},
+    }
+
+
+def test_unresolved_tenant_blocks_initial_save_when_netbox_utilities_requires_it():
+    resolver = ReferenceResolver({}, [], lambda label: None)
+
+    kwargs, unresolved, unresolved_values, missing_required = _field_kwargs(
+        TenantManagedObject,
+        tenant_record(),
+        resolver,
+        tenant_required=True,
+    )
+
+    assert kwargs is None
+    assert unresolved == []
+    assert unresolved_values == []
+    assert missing_required == []
+
+
+def test_unresolved_optional_tenant_remains_deferred_without_requirement():
+    resolver = ReferenceResolver({}, [], lambda label: None)
+
+    kwargs, unresolved, unresolved_values, missing_required = _field_kwargs(
+        TenantManagedObject,
+        tenant_record(),
+        resolver,
+        tenant_required=False,
+    )
+
+    assert kwargs == {}
+    assert unresolved == [("tenant", {"ref": "tenancy.tenant:23"})]
+    assert unresolved_values == []
+    assert missing_required == []