Add eloquent test for cursor pagination with union and multiple aliases

tests/Integration/Database/EloquentCursorPaginateTest.php

@@ -21,6 +21,7 @@ protected function afterRefreshingDatabase()
 
         Schema::create('test_users', function ($table) {
             $table->increments('id');
+            $table->string('name')->nullable();
             $table->timestamps();
         });
     }
@@ -167,6 +168,32 @@ public function testPaginationWithMultipleWhereClauses()
         );
     }
 
+    public function testPaginationWithMultipleAliases()
+    {
+        TestUser::create(['name' => 'A (user)']);
+        TestUser::create(['name' => 'C (user)']);
+
+        TestPost::create(['title' => 'B (post)']);
+        TestPost::create(['title' => 'D (post)']);
+
+        $table1 = TestPost::select(['title as alias']);
+        $table2 = TestUser::select(['name as alias']);
+
+        $columns = ['alias'];
+        $cursorName = 'cursor-name';
+        $cursor = new Cursor(['alias' => 'A (user)']);
+
+        $result = $table1->toBase()
+            ->union($table2->toBase())
+            ->orderBy('alias', 'asc')
+            ->cursorPaginate(1, $columns, $cursorName, $cursor);
+
+        $this->assertSame(['alias'], $result->getOptions()['parameters']);
+
+        $this->assertCount(1, $result->items(), 'Expect cursor paginated query should have 1 result');
+        $this->assertEquals('B (post)', current($result->items())->alias, 'Expect the paginated query would return `B (post)`');
+    }
+
     public function testPaginationWithAliasedOrderBy()
     {
         for ($i = 1; $i <= 6; $i++) {