Adds unit tests for idType

tests/Database/DatabaseEloquentModelTest.php

@@ -1319,6 +1319,28 @@ public function testIssetBehavesCorrectlyWithAttributesAndRelationships()
         $this->assertTrue(isset($model->some_relation));
     }
 
+    public function testIntIdTypePreserved()
+    {
+        $model = $this->getMock('EloquentModelStub', ['newQueryWithoutScopes', 'updateTimestamps', 'refresh']);
+        $query = m::mock('Illuminate\Database\Eloquent\Builder');
+        $query->shouldReceive('insertGetId')->once()->with([], 'id')->andReturn(1);
+        $model->expects($this->once())->method('newQueryWithoutScopes')->will($this->returnValue($query));
+
+        $this->assertTrue($model->save());
+        $this->assertEquals(1, $model->id);
+    }
+
+    public function testStringIdTypePreserved()
+    {
+        $model = $this->getMock('EloquentIdTypeModelStub', ['newQueryWithoutScopes', 'updateTimestamps', 'refresh']);
+        $query = m::mock('Illuminate\Database\Eloquent\Builder');
+        $query->shouldReceive('insertGetId')->once()->with([], 'id')->andReturn("string id");
+        $model->expects($this->once())->method('newQueryWithoutScopes')->will($this->returnValue($query));
+
+        $this->assertTrue($model->save());
+        $this->assertEquals("string id", $model->id);
+    }
+
     protected function addMockConnection($model)
     {
         $model->setConnectionResolver($resolver = m::mock('Illuminate\Database\ConnectionResolverInterface'));
@@ -1431,6 +1453,11 @@ public function setIncrementing($value)
     }
 }
 
+class EloquentIdTypeModelStub extends EloquentModelStub
+{
+    public $idType = "string";
+}
+
 class EloquentModelFindWithWritePdoStub extends Model
 {
     public function newQuery()