diff --git a/app/tests/Feature/Jobs/RouteSupplierLeadJobTest.php b/app/tests/Feature/Jobs/RouteSupplierLeadJobTest.php
index baa4131f..5bfc4f4b 100644
--- a/app/tests/Feature/Jobs/RouteSupplierLeadJobTest.php
+++ b/app/tests/Feature/Jobs/RouteSupplierLeadJobTest.php
@@ -46,27 +46,7 @@ function runRouteJob(int $supplierLeadId): void
     );
 }
 
-/**
- * Link Лидерра-project to supplier_project via the new pivot (Plan 1 model).
- * LeadRouter post-Plan-2 eligibility query reads project_supplier_links only —
- * legacy supplier_b{1,2,3}_project_id FK is ignored for routing.
- *
- * Guarded against re-declaration — LeadRouterTest.php declares the same helper
- * globally; Pest loads both files in one PHP process, so the second declaration
- * would Fatal. Bodies are semantically identical.
- */
-if (! function_exists('linkProjectToSupplier')) {
-    function linkProjectToSupplier(Project $project, SupplierProject $supplier): void
-    {
-        DB::table('project_supplier_links')->insert([
-            'project_id' => $project->id,
-            'supplier_project_id' => $supplier->id,
-            'platform' => $supplier->platform,
-            // @phpstan-ignore-next-line property.notFound — subject_code in $fillable/casts, IDE stubs lag
-            'subject_code' => $supplier->subject_code,
-        ]);
-    }
-}
+// `linkProjectToSupplier` helper now lives in tests/Pest.php — single source.
 
 it('routes 1 lead to N tenants — creates N deal copies (sharing-model)', function (): void {
     $supplier = SupplierProject::factory()->create([
@@ -563,9 +543,7 @@ it('caps deal creation at 3 recipients and tags deal with subject from payload',
             'tenant_id' => $t->id, 'is_active' => true,
             'daily_limit_target' => 10, 'delivered_today' => 0, 'delivery_days_mask' => 127,
         ]);
-        DB::table('project_supplier_links')->insert([
-            'project_id' => $p->id, 'supplier_project_id' => $sp->id, 'platform' => 'B1', 'subject_code' => 82,
-        ]);
+        linkProjectToSupplier($p, $sp);
     }
 
     $lead = SupplierLead::factory()->create([
diff --git a/app/tests/Feature/Services/LeadRouterTest.php b/app/tests/Feature/Services/LeadRouterTest.php
index 694c2550..a54747bb 100644
--- a/app/tests/Feature/Services/LeadRouterTest.php
+++ b/app/tests/Feature/Services/LeadRouterTest.php
@@ -19,20 +19,7 @@ beforeEach(function (): void {
     DB::statement("SELECT set_config('app.current_tenant_id', '0', true)");
 });
 
-// Guarded — RouteSupplierLeadJobTest.php declares the same helper; Pest loads
-// both files in one process, so unguarded redeclare would Fatal.
-if (! function_exists('linkProjectToSupplier')) {
-    function linkProjectToSupplier(Project $project, SupplierProject $sp): void
-    {
-        DB::table('project_supplier_links')->insert([
-            'project_id' => $project->id,
-            'supplier_project_id' => $sp->id,
-            'platform' => $sp->platform,
-            // @phpstan-ignore-next-line property.notFound — subject_code is in $fillable/casts, IDE stubs lag
-            'subject_code' => $sp->subject_code,
-        ]);
-    }
-}
+// `linkProjectToSupplier` helper now lives in tests/Pest.php — single source.
 
 it('returns project linked via pivot to the supplier_project', function (): void {
     $tenant = Tenant::factory()->create(['balance_leads' => 100]);
diff --git a/app/tests/Pest.php b/app/tests/Pest.php
index 5f4655de..86715d44 100644
--- a/app/tests/Pest.php
+++ b/app/tests/Pest.php
@@ -1,6 +1,9 @@
 <?php
 
+use App\Models\Project;
+use App\Models\SupplierProject;
 use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\DB;
 use Tests\TestCase;
 
 /*
@@ -50,3 +53,23 @@ function something()
 {
     // ..
 }
+
+/**
+ * Link a Лидерра-project to a supplier_project via the M:N pivot
+ * (Plan 1 model). Post-Plan-2 LeadRouter eligibility queries the pivot
+ * only; legacy supplier_b{1,2,3}_project_id FK is ignored for routing.
+ *
+ * Single source — replaces previous duplicated declarations in
+ * LeadRouterTest.php / RouteSupplierLeadJobTest.php (Plan 2 cleanup).
+ * pivot created_at has DEFAULT NOW(); supplier->subject_code may be null.
+ */
+function linkProjectToSupplier(Project $project, SupplierProject $supplier): void
+{
+    DB::table('project_supplier_links')->insert([
+        'project_id' => $project->id,
+        'supplier_project_id' => $supplier->id,
+        'platform' => $supplier->platform,
+        // @phpstan-ignore-next-line property.notFound — subject_code is in $fillable/casts, IDE stubs lag
+        'subject_code' => $supplier->subject_code,
+    ]);
+}