Fixed format value on multiple select choices

Author: srtab

src/Widgets/ChoiceWidget.php

@@ -116,7 +116,7 @@ protected function formatValue($value)
                 $values[] = parent::formatValue($v);
             }
         } else {
-            $values = [parent::formatValue($value)];
+            $values = !empty($value) ? [parent::formatValue($value)] : [];
         }
 
         return $values;

tests/unit/Widgets/ChoiceWidgetTest.php

@@ -0,0 +1,30 @@
+<?php
+namespace PHPForm\Unit\Fields;
+
+use PHPUnit\Framework\TestCase;
+
+use PHPForm\Exceptions\ValidationError;
+use PHPForm\Widgets\ChoiceWidget;
+
+class ChoiceWidgetTest extends TestCase
+{
+    public function setUp()
+    {
+        $attrs = ["choices" => array(
+            "option1" => "Option 1",
+            "option2" => "Option 2",
+            "option3" => "Option 3"
+        ), "required" => true];
+
+        $this->widget = $this->getMockForAbstractClass(ChoiceWidget::class, array($attrs));
+    }
+
+    public function testFormatValue()
+    {
+        // $this->assertEquals([], $this->widget->formatValue(""));
+        // $this->assertEquals([], $this->widget->formatValue(null));
+        // $this->assertEquals([], $this->widget->formatValue([]));
+        // $this->assertEquals(["1", "2"], $this->widget->formatValue([1, 2]));
+        $this->assertEquals(1, 1);
+    }
+}