diff --git a/tests/MageTest/Command/BuiltIn/LockCommandTest.php b/tests/MageTest/Command/BuiltIn/LockCommandTest.php
new file mode 100644
index 0000000..b814ed6
--- /dev/null
+++ b/tests/MageTest/Command/BuiltIn/LockCommandTest.php
@@ -0,0 +1,199 @@
+<?php
+
+namespace MageTest\Command\BuiltIn;
+
+use Mage\Command\BuiltIn\LockCommand;
+use MageTest\TestHelper\BaseTest;
+use malkusch\phpmock\FixedValueFunction;
+use malkusch\phpmock\MockBuilder;
+
+/**
+ * Class LockCommandTest
+ * @package MageTest\Command\BuiltIn
+ * @coversDefaultClass Mage\Command\BuiltIn\LockCommand
+ * @uses malkusch\phpmock\MockBuilder
+ * @uses malkusch\phpmock\FixedValueFunction
+ * @uses malkusch\phpmock\Mock
+ * @uses Mage\Console\Colors
+ * @uses Mage\Console
+ * @uses Mage\Command\AbstractCommand
+ */
+class LockCommandTest extends BaseTest
+{
+    public static $fgetsCount;
+    public static $mockName;
+    public static $mockEmail;
+    public static $mockDesc;
+    public static $filePutContentsResult;
+    public static $filePutContentsFile;
+
+    /**
+     * @var LockCommand
+     */
+    private $lockCommand;
+
+    /**
+     * @var FixedValueFunction
+     */
+    private $fgetsValue;
+
+    /**
+     * @before
+     */
+    public function before()
+    {
+        self::$fgetsCount = 0;
+        $this->lockCommand = new LockCommand();
+
+        $mockBuilder = new MockBuilder();
+        $fopenMock = $mockBuilder
+            ->setName('fopen')
+            ->setNamespace('Mage')
+            ->setFunction(function () {
+                return 'a';
+            })
+            ->build();
+
+        $this->fgetsValue = new FixedValueFunction();
+        $fgetsMock = $mockBuilder
+            ->setNamespace('Mage')
+            ->setName('fgets')
+            ->setFunction(
+                function () {
+                    switch (LockCommandTest::$fgetsCount) {
+                        case 0:
+                            LockCommandTest::$fgetsCount++;
+                            return LockCommandTest::$mockName;
+                        case 1:
+                            LockCommandTest::$fgetsCount++;
+                            return LockCommandTest::$mockEmail;
+                        case 2:
+                            LockCommandTest::$fgetsCount++;
+                            return LockCommandTest::$mockDesc;
+                        default:
+                            throw new \Exception('"fgets" count limit exceed');
+                    }
+                }
+            )
+            ->build();
+        $getCwdMock = $mockBuilder
+            ->setNamespace('Mage\Command\Builtin')
+            ->setName('getcwd')
+            ->setFunction(
+                function () {
+                    return '';
+                }
+            )
+            ->build();
+        $fileGetContentsMock = $mockBuilder
+            ->setNamespace('Mage\Command\Builtin')
+            ->setName('file_put_contents')
+            ->setFunction(
+                function ($file, $contents) {
+                    LockCommandTest::$filePutContentsFile = $file;
+                    LockCommandTest::$filePutContentsResult = $contents;
+                }
+            )
+            ->build();
+
+        $dateMock = $mockBuilder
+            ->setNamespace('Mage\Command\BuiltIn')
+            ->setName('date')
+            ->setFunction(
+                function () {
+                    return '2015-01-01 12:00:00';
+                }
+            )
+            ->build();
+
+        $fopenMock->disable();
+        $fgetsMock->disable();
+        $getCwdMock->disable();
+        $fileGetContentsMock->disable();
+        $dateMock->disable();
+
+        $fopenMock->enable();
+        $fgetsMock->enable();
+        $getCwdMock->enable();
+        $fileGetContentsMock->enable();
+        $dateMock->enable();
+
+        $this->setUpConsoleStatics();
+    }
+
+    public function lockCommandProvider()
+    {
+        return array(
+            'normal' => array(
+                'name' => 'John Smith',
+                'email' => 'john.smith@example.com',
+                'description' => "There's a critical bug here!",
+                'expectedLockFileContents' => "Locked environment at date: 2015-01-01 12:00:00\n"
+                    . "Locked by John Smith (john.smith@example.com)\n"
+                    . "There's a critical bug here!\n",
+            ),
+            'with_no_name' => array(
+                'name' => '',
+                'email' => 'john.smith@example.com',
+                'description' => "There's a critical bug here!",
+                'expectedLockFileContents' => "Locked environment at date: 2015-01-01 12:00:00\n"
+                    . "(john.smith@example.com)\n"
+                    . "There's a critical bug here!\n",
+            ),
+            'with_no_email' => array(
+                'name' => 'John Smith',
+                'email' => '',
+                'description' => "There's a critical bug here!",
+                'expectedLockFileContents' => "Locked environment at date: 2015-01-01 12:00:00\n"
+                    . "Locked by John Smith \n"
+                    . "There's a critical bug here!\n",
+            ),
+            'with_no_name_nor_email' => array(
+                'name' => '',
+                'email' => '',
+                'description' => "There's a critical bug here!",
+                'expectedLockFileContents' => "Locked environment at date: 2015-01-01 12:00:00\n"
+                    . "\n"
+                    . "There's a critical bug here!\n",
+            ),
+            'with_no_desciption' => array(
+                'name' => 'John Smith',
+                'email' => 'john.smith@example.com',
+                'description' => '',
+                'expectedLockFileContents' => "Locked environment at date: 2015-01-01 12:00:00\n"
+                    . "Locked by John Smith (john.smith@example.com)"
+            ),
+        );
+    }
+
+    /**
+     * @covers ::run
+     * @dataProvider lockCommandProvider
+     */
+    public function testRun($name, $email, $description, $expectedLockFileContents)
+    {
+        $expectedOutput = "Your name (enter to leave blank): "
+            . "Your email (enter to leave blank): "
+            . "Reason of lock (enter to leave blank): "
+            . "\tLocked deployment to production environment\n\n";
+        $this->expectOutputString($expectedOutput);
+        $expectedLockFilePath = '/.mage/production.lock';
+        $expectedExitCode = 0;
+
+        self::$mockName = $name;
+        self::$mockEmail = $email;
+        self::$mockDesc = $description;
+
+        $configMock = $this->getMock('Mage\Config');
+        $configMock->expects($this->atLeastOnce())
+            ->method('getEnvironment')
+            ->willReturn('production');
+        $this->lockCommand->setConfig($configMock);
+
+        $actualExitCode = $this->lockCommand->run();
+
+        $this->assertEquals($expectedExitCode, $actualExitCode);
+        $this->assertEquals($expectedLockFileContents, self::$filePutContentsResult);
+        $this->assertEquals($expectedLockFilePath, self::$filePutContentsFile);
+    }
+}