Added DataColumnTest

tests/framework/grid/DataColumnTest.php

@@ -0,0 +1,44 @@
+<?php
+
+
+namespace yiiunit\framework\grid;
+
+use yii\data\ArrayDataProvider;
+use yii\grid\GridView;
+use yiiunit\data\ar\Order;
+
+/**
+ * @author Dmitry Naumenko <d.naumenko.a@gmail.com>
+ *
+ * @group grid
+ */
+class DataColumnTest extends \yiiunit\TestCase
+{
+    public function setUp()
+    {
+        parent::setUp();
+        $this->mockApplication();
+    }
+
+    public function testColumnLabelsOnEmptyProvider()
+    {
+        $grid = new GridView([
+            'dataProvider' => new ArrayDataProvider([
+                'allModels' => [],
+                'totalCount' => 0,
+                'modelClass' => Order::className()
+            ]),
+            'columns' => ['customer_id', 'total']
+        ]);
+
+        $labels = [];
+        foreach ($grid->columns as $column) {
+            $method = new \ReflectionMethod($column, 'getHeaderCellLabel');
+            $method->setAccessible(true);
+            $labels[] = $method->invoke($column);
+            $method->setAccessible(false);
+        }
+
+        $this->assertEquals(['Customer', 'Invoice Total'], $labels);
+    }
+}