added unit test to verify storing of null values

tests/unit/data/ar/NullValues.php

+<?php
+
+namespace yiiunit\data\ar;
+
+/**
+ * Class NullValues
+ *
+ * @property integer $id
+ * @property integer $var1
+ * @property integer $var2
+ * @property integer $var3
+ * @property string $stringcol
+ */
+class NullValues extends ActiveRecord
+{
+	public static function tableName()
+	{
+		return 'tbl_null_values';
+	}
+}

tests/unit/data/cubrid.sql

@@ -9,6 +9,7 @@ DROP TABLE IF EXISTS tbl_item;
 DROP TABLE IF EXISTS tbl_order;
 DROP TABLE IF EXISTS tbl_category;
 DROP TABLE IF EXISTS tbl_customer;
+DROP TABLE IF EXISTS tbl_null_values;
 DROP TABLE IF EXISTS tbl_type;
 DROP TABLE IF EXISTS tbl_constraints;
 
@@ -61,6 +62,16 @@ CREATE TABLE `tbl_order_item` (
   CONSTRAINT `FK_order_item_item_id` FOREIGN KEY (`item_id`) REFERENCES `tbl_item` (`id`) ON DELETE CASCADE
 );
 
+CREATE TABLE tbl_null_values (
+  `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
+  `var1` INT UNSIGNED NULL,
+  `var2` INT NULL,
+  `var3` INT DEFAULT NULL,
+  `stringcol` VARCHAR (32) DEFAULT NULL,
+  PRIMARY KEY (id)
+);
+
+
 CREATE TABLE `tbl_type` (
   `int_col` int(11) NOT NULL,
   `int_col2` int(11) DEFAULT '1',

tests/unit/data/mssql.sql

@@ -4,6 +4,7 @@ IF OBJECT_ID('[dbo].[tbl_order]', 'U') IS NOT NULL DROP TABLE [dbo].[tbl_order];
 IF OBJECT_ID('[dbo].[tbl_category]', 'U') IS NOT NULL DROP TABLE [dbo].[tbl_category];
 IF OBJECT_ID('[dbo].[tbl_customer]', 'U') IS NOT NULL DROP TABLE [dbo].[tbl_customer];
 IF OBJECT_ID('[dbo].[tbl_type]', 'U') IS NOT NULL DROP TABLE [dbo].[tbl_type];
+IF OBJECT_ID('[dbo].[tbl_null_values]', 'U') IS NOT NULL DROP TABLE [dbo].[tbl_null_values];
 
 CREATE TABLE [dbo].[tbl_customer] (
 	[id] [int] IDENTITY(1,1) NOT NULL,
@@ -54,6 +55,15 @@ CREATE TABLE [dbo].[tbl_order_item] (
 	) ON [PRIMARY]
 );
 
+CREATE TABLE [dbo].[tbl_null_values] (
+  id [int] UNSIGNED NOT NULL,
+  var1 [int] UNSIGNED NULL,
+  var2 [int] NULL,
+  var3 [int] DEFAULT NULL,
+  stringcol [varchar](32) DEFAULT NULL,
+  PRIMARY KEY (id)
+);
+
 CREATE TABLE [dbo].[tbl_type] (
 	[int_col] [int] NOT NULL,
 	[int_col2] [int] DEFAULT '1',

tests/unit/data/mysql.sql

@@ -9,6 +9,7 @@ DROP TABLE IF EXISTS tbl_item CASCADE;
 DROP TABLE IF EXISTS tbl_order CASCADE;
 DROP TABLE IF EXISTS tbl_category CASCADE;
 DROP TABLE IF EXISTS tbl_customer CASCADE;
+DROP TABLE IF EXISTS tbl_null_values CASCADE;
 DROP TABLE IF EXISTS tbl_type CASCADE;
 DROP TABLE IF EXISTS tbl_constraints CASCADE;
 
@@ -71,6 +72,15 @@ CREATE TABLE `tbl_composite_fk` (
   CONSTRAINT `FK_composite_fk_order_item` FOREIGN KEY (`order_id`,`item_id`) REFERENCES `tbl_order_item` (`order_id`,`item_id`) ON DELETE CASCADE
 );
 
+CREATE TABLE tbl_null_values (
+  `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
+  `var1` INT UNSIGNED NULL,
+  `var2` INT NULL,
+  `var3` INT DEFAULT NULL,
+  `stringcol` VARCHAR (32) DEFAULT NULL,
+  PRIMARY KEY (id)
+);
+
 CREATE TABLE `tbl_type` (
   `int_col` int(11) NOT NULL,
   `int_col2` int(11) DEFAULT '1',

tests/unit/data/postgres.sql

@@ -10,6 +10,7 @@ DROP TABLE IF EXISTS tbl_order CASCADE;
 DROP TABLE IF EXISTS tbl_category CASCADE;
 DROP TABLE IF EXISTS tbl_customer CASCADE;
 DROP TABLE IF EXISTS tbl_type CASCADE;
+DROP TABLE IF EXISTS tbl_null_values CASCADE;
 DROP TABLE IF EXISTS tbl_constraints CASCADE;
 
 CREATE TABLE tbl_constraints
@@ -54,6 +55,15 @@ CREATE TABLE tbl_order_item (
   PRIMARY KEY (order_id,item_id)
 );
 
+CREATE TABLE tbl_null_values (
+  id INT UNSIGNED AUTOINCREMENT NOT NULL,
+  var1 INT UNSIGNED NULL,
+  var2 INT NULL,
+  var3 INT DEFAULT NULL,
+  stringcol VARCHAR(32) DEFAULT NULL,
+  PRIMARY KEY (id)
+);
+
 CREATE TABLE tbl_type (
   int_col integer NOT NULL,
   int_col2 integer DEFAULT '1',

tests/unit/data/sqlite.sql

@@ -10,6 +10,7 @@ DROP TABLE IF EXISTS tbl_order;
 DROP TABLE IF EXISTS tbl_category;
 DROP TABLE IF EXISTS tbl_customer;
 DROP TABLE IF EXISTS tbl_type;
+DROP TABLE IF EXISTS tbl_null_values;
 
 CREATE TABLE tbl_customer (
   id INTEGER NOT NULL,
@@ -57,6 +58,14 @@ CREATE TABLE `tbl_composite_fk` (
   CONSTRAINT `FK_composite_fk_order_item` FOREIGN KEY (`order_id`,`item_id`) REFERENCES `tbl_order_item` (`order_id`,`item_id`) ON DELETE CASCADE
 );
 
+CREATE TABLE tbl_null_values (
+  id INTEGER UNSIGNED PRIMARY KEY NOT NULL,
+  var1 INTEGER UNSIGNED,
+  var2 INTEGER,
+  var3 INTEGER DEFAULT NULL,
+  stringcol VARCHAR(32) DEFAULT NULL
+);
+
 CREATE TABLE tbl_type (
   int_col INTEGER NOT NULL,
   int_col2 INTEGER DEFAULT '1',

tests/unit/framework/db/ActiveRecordTest.php

@@ -4,6 +4,7 @@ namespace yiiunit\framework\db;
 use yii\db\ActiveQuery;
 use yiiunit\data\ar\ActiveRecord;
 use yiiunit\data\ar\Customer;
+use yiiunit\data\ar\NullValues;
 use yiiunit\data\ar\OrderItem;
 use yiiunit\data\ar\Order;
 use yiiunit\data\ar\Item;
@@ -375,4 +376,54 @@ class ActiveRecordTest extends DatabaseTestCase
 		$customers = Customer::find()->all();
 		$this->assertEquals(0, count($customers));
 	}
+
+	public function testStoreNull()
+	{
+		$record = new NullValues();
+		$this->assertNull($record->var1);
+		$this->assertNull($record->var2);
+		$this->assertNull($record->var3);
+		$this->assertNull($record->stringcol);
+
+		$record->id = 1;
+
+		$record->var1 = 123;
+		$record->var2 = 456;
+		$record->var3 = 789;
+		$record->stringcol = 'hello!';
+
+		$record->save(false);
+		$this->assertTrue($record->refresh());
+
+		$this->assertEquals(123, $record->var1);
+		$this->assertEquals(456, $record->var2);
+		$this->assertEquals(789, $record->var3);
+		$this->assertEquals('hello!', $record->stringcol);
+
+		$record->var1 = null;
+		$record->var2 = null;
+		$record->var3 = null;
+		$record->stringcol = null;
+
+		$record->save(false);
+		$this->assertTrue($record->refresh());
+
+		$this->assertNull($record->var1);
+		$this->assertNull($record->var2);
+		$this->assertNull($record->var3);
+		$this->assertNull($record->stringcol);
+
+		$record->var1 = 0;
+		$record->var2 = 0;
+		$record->var3 = 0;
+		$record->stringcol = '';
+
+		$record->save(false);
+		$this->assertTrue($record->refresh());
+
+		$this->assertEquals(0, $record->var1);
+		$this->assertEquals(0, $record->var2);
+		$this->assertEquals(0, $record->var3);
+		$this->assertEquals('', $record->stringcol);
+	}
 }