Test get through relations with customized local keys

tests/BelongsToThroughTest.php

@@ -4,8 +4,10 @@
 
 use Tests\Models\Comment;
 use Tests\Models\Country;
+use Tests\Models\CustomerAddress;
 use Tests\Models\Post;
 use Tests\Models\User;
+use Tests\Models\VendorCustomer;
 
 class BelongsToThroughTest extends TestCase
 {
@@ -134,4 +136,14 @@ public function testGetThroughParents()
         $this->assertInstanceOf(User::class, $throughParents[0]);
         $this->assertInstanceOf(Post::class, $throughParents[1]);
     }
+
+    public function testGetThroughWithCustomizedLocalKeys()
+    {
+        $addresses = CustomerAddress::with('vendorCustomer')->get();
+
+        $this->assertEquals(41, $addresses[0]->vendorCustomer->id);
+        $this->assertEquals(42, $addresses[1]->vendorCustomer->id);
+        $this->assertInstanceOf(VendorCustomer::class, $addresses[1]->vendorCustomer);
+        $this->assertFalse($addresses[2]->vendorCustomer()->exists());
+    }
 }

tests/Models/CustomerAddress.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Tests\Models;
+
+use Znck\Eloquent\Relations\BelongsToThrough;
+
+class CustomerAddress extends Model
+{
+    public function vendorCustomer(): BelongsToThrough
+    {
+        return $this->belongsToThrough(
+            VendorCustomer::class, 
+            VendorCustomerAddress::class,
+            foreignKeyLookup: [VendorCustomerAddress::class => 'id'],
+            localKeyLookup: [VendorCustomerAddress::class => 'customer_address_id'],
+        );
+    }
+}

tests/Models/VendorCustomer.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Tests\Models;
+
+class VendorCustomer extends Model
+{
+    //
+}

tests/Models/VendorCustomerAddress.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Tests\Models;
+
+class VendorCustomerAddress extends Model
+{
+    //
+}

tests/TestCase.php

@@ -9,8 +9,11 @@
 use PHPUnit\Framework\TestCase as Base;
 use Tests\Models\Comment;
 use Tests\Models\Country;
+use Tests\Models\CustomerAddress;
 use Tests\Models\Post;
 use Tests\Models\User;
+use Tests\Models\VendorCustomer;
+use Tests\Models\VendorCustomerAddress;
 
 abstract class TestCase extends Base
 {
@@ -61,6 +64,20 @@ protected function migrate()
             $table->unsignedInteger('custom_post_id')->nullable();
             $table->unsignedInteger('parent_id')->nullable();
         });
+
+        DB::schema()->create('vendor_customers', function (Blueprint $table) {
+            $table->increments('id');
+        });
+
+        DB::schema()->create('customer_addresses', function (Blueprint $table) {
+            $table->increments('id');
+        });
+
+        DB::schema()->create('vendor_customer_addresses', function (Blueprint $table) {
+            $table->increments('id');
+            $table->unsignedInteger('vendor_customer_id');
+            $table->unsignedInteger('customer_address_id');
+        });
     }
 
     /**
@@ -91,6 +108,17 @@ protected function seed()
         Comment::create(['id' => 34, 'post_id' => null, 'custom_post_id' => 21, 'parent_id' => 33]);
         Comment::create(['id' => 35, 'post_id' => null, 'custom_post_id' => 24, 'parent_id' => 34]);
 
+        VendorCustomer::create(['id' => 41]);
+        VendorCustomer::create(['id' => 42]);
+        VendorCustomer::create(['id' => 43]);
+
+        CustomerAddress::create(['id' => 51]);
+        CustomerAddress::create(['id' => 52]);
+        CustomerAddress::create(['id' => 53]);
+
+        VendorCustomerAddress::create(['id' => 61, 'vendor_customer_id' => 41, 'customer_address_id' => 51]);
+        VendorCustomerAddress::create(['id' => 62, 'vendor_customer_id' => 42, 'customer_address_id' => 52]);
+
         Model::reguard();
     }
 }