diff --git a/.gitattributes b/.gitattributes
index 7cb1419..f726fe2 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,7 +1,10 @@
-/.gitattributes export-ignore
-/.gitignore export-ignore
-/.scrutinizer.yml export-ignore
-/composer.lock export-ignore
-/phpunit.xml.dist export-ignore
-/doc export-ignore
-/tests export-ignore
+/.gitattributes         export-ignore
+/.gitignore             export-ignore
+/.scrutinizer.yml       export-ignore
+/.sensiolabs.yml        export-ignore
+
+/composer.lock          export-ignore
+/phpunit.xml.dist       export-ignore
+
+/doc                    export-ignore
+/tests                  export-ignore
diff --git a/.gitignore b/.gitignore
index 61ead86..2f85675 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
+/tests/runtime
 /vendor
diff --git a/.scrutinizer.yml b/.scrutinizer.yml
index 539311f..f146a98 100644
--- a/.scrutinizer.yml
+++ b/.scrutinizer.yml
@@ -1,7 +1,7 @@
 build:
     environment:
         php:
-            version: 5.6.16
+            version: 5.6
     dependencies:
         before:
             - sudo composer self-update
@@ -9,8 +9,10 @@ build:
 imports:
     - php
 tools:
-    php_sim: false
     php_cpd: false
+    php_sim: false
 filter:
     excluded_paths:
+        - docs/*
+        - tests/*
         - vendor/*
diff --git a/.sensiolabs.yml b/.sensiolabs.yml
new file mode 100644
index 0000000..2477722
--- /dev/null
+++ b/.sensiolabs.yml
@@ -0,0 +1,6 @@
+exclude_patterns:
+    - docs/*
+    - tests/*
+    - vendor/*
+    - "*.jpg"
+    - "*.png"
diff --git a/composer.json b/composer.json
index 968b616..7dcbbb1 100644
--- a/composer.json
+++ b/composer.json
@@ -20,12 +20,15 @@
     "require": {
         "yiisoft/yii2": "~2.0.1"
     },
+    "require-dev": {
+        "phpunit/phpunit": "^5.4"
+    },
     "config": {
         "process-timeout": 1800
     },
     "autoload": {
         "psr-4": {
-            "sergeymakinen\\facades\\": ""
+            "sergeymakinen\\facades\\": "src"
         }
     }
 }
diff --git a/composer.lock b/composer.lock
index 5cd5442..4445aa8 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,8 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "c9b5556ad2f126deb05f179b95ca9163",
-    "content-hash": "109114ed9efce9c2fc17daccf0db2c9b",
+    "hash": "75420ed1b51ad29c5ca78545bd06d4ef",
+    "content-hash": "4773caf3b8518d0e52df61d2c6f89f7d",
     "packages": [
         {
             "name": "bower-asset/jquery",
@@ -323,7 +323,1316 @@
             "time": "2016-06-05 20:34:32"
         }
     ],
-    "packages-dev": [],
+    "packages-dev": [
+        {
+            "name": "doctrine/instantiator",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/instantiator.git",
+                "reference": "416fb8ad1d095a87f1d21bc40711843cd122fd4a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/416fb8ad1d095a87f1d21bc40711843cd122fd4a",
+                "reference": "416fb8ad1d095a87f1d21bc40711843cd122fd4a",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3,<8.0-DEV"
+            },
+            "require-dev": {
+                "athletic/athletic": "~0.1.8",
+                "ext-pdo": "*",
+                "ext-phar": "*",
+                "phpunit/phpunit": "~4.0",
+                "squizlabs/php_codesniffer": "~2.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com",
+                    "homepage": "http://ocramius.github.com/"
+                }
+            ],
+            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
+            "homepage": "https://github.com/doctrine/instantiator",
+            "keywords": [
+                "constructor",
+                "instantiate"
+            ],
+            "time": "2016-03-31 10:24:22"
+        },
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.5.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "399c1f9781e222f6eb6cc238796f5200d1b7f108"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/399c1f9781e222f6eb6cc238796f5200d1b7f108",
+                "reference": "399c1f9781e222f6eb6cc238796f5200d1b7f108",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4.0"
+            },
+            "require-dev": {
+                "doctrine/collections": "1.*",
+                "phpunit/phpunit": "~4.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "homepage": "https://github.com/myclabs/DeepCopy",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "time": "2016-10-31 17:19:45"
+        },
+        {
+            "name": "phpdocumentor/reflection-common",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
+                "reference": "144c307535e82c8fdcaacbcfc1d6d8eeb896687c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/144c307535e82c8fdcaacbcfc1d6d8eeb896687c",
+                "reference": "144c307535e82c8fdcaacbcfc1d6d8eeb896687c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "phpDocumentor\\Reflection\\": [
+                        "src"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jaap van Otterdijk",
+                    "email": "opensource@ijaap.nl"
+                }
+            ],
+            "description": "Common reflection classes used by phpdocumentor to reflect the code structure",
+            "homepage": "http://www.phpdoc.org",
+            "keywords": [
+                "FQSEN",
+                "phpDocumentor",
+                "phpdoc",
+                "reflection",
+                "static analysis"
+            ],
+            "time": "2015-12-27 11:43:31"
+        },
+        {
+            "name": "phpdocumentor/reflection-docblock",
+            "version": "3.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
+                "reference": "8331b5efe816ae05461b7ca1e721c01b46bafb3e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/8331b5efe816ae05461b7ca1e721c01b46bafb3e",
+                "reference": "8331b5efe816ae05461b7ca1e721c01b46bafb3e",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5",
+                "phpdocumentor/reflection-common": "^1.0@dev",
+                "phpdocumentor/type-resolver": "^0.2.0",
+                "webmozart/assert": "^1.0"
+            },
+            "require-dev": {
+                "mockery/mockery": "^0.9.4",
+                "phpunit/phpunit": "^4.4"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "phpDocumentor\\Reflection\\": [
+                        "src/"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Mike van Riel",
+                    "email": "me@mikevanriel.com"
+                }
+            ],
+            "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
+            "time": "2016-09-30 07:12:33"
+        },
+        {
+            "name": "phpdocumentor/type-resolver",
+            "version": "0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/TypeResolver.git",
+                "reference": "b39c7a5b194f9ed7bd0dd345c751007a41862443"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/b39c7a5b194f9ed7bd0dd345c751007a41862443",
+                "reference": "b39c7a5b194f9ed7bd0dd345c751007a41862443",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5",
+                "phpdocumentor/reflection-common": "^1.0"
+            },
+            "require-dev": {
+                "mockery/mockery": "^0.9.4",
+                "phpunit/phpunit": "^5.2||^4.8.24"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "phpDocumentor\\Reflection\\": [
+                        "src/"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Mike van Riel",
+                    "email": "me@mikevanriel.com"
+                }
+            ],
+            "time": "2016-06-10 07:14:17"
+        },
+        {
+            "name": "phpspec/prophecy",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpspec/prophecy.git",
+                "reference": "6c52c2722f8460122f96f86346600e1077ce22cb"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/6c52c2722f8460122f96f86346600e1077ce22cb",
+                "reference": "6c52c2722f8460122f96f86346600e1077ce22cb",
+                "shasum": ""
+            },
+            "require": {
+                "doctrine/instantiator": "^1.0.2",
+                "php": "^5.3|^7.0",
+                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2",
+                "sebastian/comparator": "^1.1",
+                "sebastian/recursion-context": "^1.0|^2.0"
+            },
+            "require-dev": {
+                "phpspec/phpspec": "^2.0",
+                "phpunit/phpunit": "^4.8 || ^5.6.5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.6.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Prophecy\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Konstantin Kudryashov",
+                    "email": "ever.zet@gmail.com",
+                    "homepage": "http://everzet.com"
+                },
+                {
+                    "name": "Marcello Duarte",
+                    "email": "marcello.duarte@gmail.com"
+                }
+            ],
+            "description": "Highly opinionated mocking framework for PHP 5.3+",
+            "homepage": "https://github.com/phpspec/prophecy",
+            "keywords": [
+                "Double",
+                "Dummy",
+                "fake",
+                "mock",
+                "spy",
+                "stub"
+            ],
+            "time": "2016-11-21 14:58:47"
+        },
+        {
+            "name": "phpunit/php-code-coverage",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
+                "reference": "6cba06ff75a1a63a71033e1a01b89056f3af1e8d"
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+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.6 || ^7.0",
+                "phpunit/php-file-iterator": "~1.3",
+                "phpunit/php-text-template": "~1.2",
+                "phpunit/php-token-stream": "^1.4.2",
+                "sebastian/code-unit-reverse-lookup": "~1.0",
+                "sebastian/environment": "^1.3.2 || ^2.0",
+                "sebastian/version": "~1.0|~2.0"
+            },
+            "require-dev": {
+                "ext-xdebug": ">=2.1.4",
+                "phpunit/phpunit": "^5.4"
+            },
+            "suggest": {
+                "ext-dom": "*",
+                "ext-xdebug": ">=2.4.0",
+                "ext-xmlwriter": "*"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sb@sebastian-bergmann.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that provides collection, processing, and rendering functionality for PHP code coverage information.",
+            "homepage": "https://github.com/sebastianbergmann/php-code-coverage",
+            "keywords": [
+                "coverage",
+                "testing",
+                "xunit"
+            ],
+            "time": "2016-11-01 05:06:24"
+        },
+        {
+            "name": "phpunit/php-file-iterator",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
+                "reference": "3cc8f69b3028d0f96a9078e6295d86e9bf019be5"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/3cc8f69b3028d0f96a9078e6295d86e9bf019be5",
+                "reference": "3cc8f69b3028d0f96a9078e6295d86e9bf019be5",
+                "shasum": ""
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+            },
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+            "extra": {
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sb@sebastian-bergmann.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "FilterIterator implementation that filters files based on a list of suffixes.",
+            "homepage": "https://github.com/sebastianbergmann/php-file-iterator/",
+            "keywords": [
+                "filesystem",
+                "iterator"
+            ],
+            "time": "2016-10-03 07:40:28"
+        },
+        {
+            "name": "phpunit/php-text-template",
+            "version": "1.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-text-template.git",
+                "reference": "31f8b717e51d9a2afca6c9f046f5d69fc27c8686"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-text-template/zipball/31f8b717e51d9a2afca6c9f046f5d69fc27c8686",
+                "reference": "31f8b717e51d9a2afca6c9f046f5d69fc27c8686",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Simple template engine.",
+            "homepage": "https://github.com/sebastianbergmann/php-text-template/",
+            "keywords": [
+                "template"
+            ],
+            "time": "2015-06-21 13:50:34"
+        },
+        {
+            "name": "phpunit/php-timer",
+            "version": "1.0.8",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-timer.git",
+                "reference": "38e9124049cf1a164f1e4537caf19c99bf1eb260"
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+            },
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+            "autoload": {
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+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sb@sebastian-bergmann.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Utility class for timing",
+            "homepage": "https://github.com/sebastianbergmann/php-timer/",
+            "keywords": [
+                "timer"
+            ],
+            "time": "2016-05-12 18:03:57"
+        },
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+            "version": "dev-master",
+            "source": {
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+                "url": "https://github.com/sebastianbergmann/php-token-stream.git",
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
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+            "description": "Wrapper around PHP's tokenizer extension.",
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+            "keywords": [
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+                    "Symfony\\Component\\Yaml\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony Yaml Component",
+            "homepage": "https://symfony.com",
+            "time": "2016-11-19 20:35:20"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "4a8bf11547e139e77b651365113fc12850c43d9a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/4a8bf11547e139e77b651365113fc12850c43d9a",
+                "reference": "4a8bf11547e139e77b651365113fc12850c43d9a",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6",
+                "sebastian/version": "^1.0.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.3-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "time": "2016-11-23 20:04:41"
+        }
+    ],
     "aliases": [],
     "minimum-stability": "dev",
     "stability-flags": [],
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
new file mode 100644
index 0000000..3a7669f
--- /dev/null
+++ b/phpunit.xml.dist
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit backupGlobals="false"
+    backupStaticAttributes="false"
+    bootstrap="./tests/bootstrap.php"
+    colors="true"
+    convertErrorsToExceptions="true"
+    convertNoticesToExceptions="true"
+    convertWarningsToExceptions="true"
+    processIsolation="false"
+    stopOnError="false"
+    stopOnFailure="false"
+    syntaxCheck="true"
+    verbose="true">
+    <testsuites>
+        <testsuite name="Test Suite">
+            <directory suffix="Test.php">./tests</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory suffix=".php">./src</directory>
+        </whitelist>
+    </filter>
+</phpunit>
diff --git a/Asset.php b/src/Asset.php
similarity index 100%
rename from Asset.php
rename to src/Asset.php
diff --git a/Auth.php b/src/Auth.php
similarity index 100%
rename from Auth.php
rename to src/Auth.php
diff --git a/Cache.php b/src/Cache.php
similarity index 97%
rename from Cache.php
rename to src/Cache.php
index b0bc89e..f6f9f12 100644
--- a/Cache.php
+++ b/src/Cache.php
@@ -50,9 +50,6 @@
  * @method static bool flush() Deletes all values from cache.
  * @see \yii\caching\Cache::flush
  *
- * @method static mixed get(mixed $key) Retrieves a value from cache with a specified key.
- * @see \yii\caching\Cache::get
- *
  * @method static null|\yii\base\Behavior getBehavior(string $name) Returns the named behavior object.
  * @see \yii\base\Component::getBehavior
  *
@@ -130,7 +127,7 @@ public static function getFacadeComponentId()
      * the corresponding value in the cache will be invalidated when it is fetched via [[get()]].
      * This parameter is ignored if [[serializer]] is false.
      *
-     * @return bool whether the value is successfully stored into cache.
+     * @return mixed the value stored into cache.
      */
     public static function cache($key, $default, $duration = 0, $dependency = null)
     {
diff --git a/Db.php b/src/Db.php
similarity index 100%
rename from Db.php
rename to src/Db.php
diff --git a/Error.php b/src/Error.php
similarity index 100%
rename from Error.php
rename to src/Error.php
diff --git a/Facade.php b/src/Facade.php
similarity index 97%
rename from Facade.php
rename to src/Facade.php
index 0df76d3..0678220 100644
--- a/Facade.php
+++ b/src/Facade.php
@@ -141,19 +141,25 @@ public static function __callStatic($name, $arguments)
 
     /**
      * @inheritDoc
+     * @codeCoverageIgnore
      */
     private function __construct()
-    {}
+    {
+    }
 
     /**
      * @inheritDoc
+     * @codeCoverageIgnore
      */
     private function __wakeup()
-    {}
+    {
+    }
 
     /**
      * @inheritDoc
+     * @codeCoverageIgnore
      */
     private function __clone()
-    {}
+    {
+    }
 }
diff --git a/Formatter.php b/src/Formatter.php
similarity index 100%
rename from Formatter.php
rename to src/Formatter.php
diff --git a/Http.php b/src/Http.php
similarity index 100%
rename from Http.php
rename to src/Http.php
diff --git a/I18n.php b/src/I18n.php
similarity index 100%
rename from I18n.php
rename to src/I18n.php
diff --git a/Log.php b/src/Log.php
similarity index 100%
rename from Log.php
rename to src/Log.php
diff --git a/Mailer.php b/src/Mailer.php
similarity index 100%
rename from Mailer.php
rename to src/Mailer.php
diff --git a/Redis.php b/src/Redis.php
similarity index 100%
rename from Redis.php
rename to src/Redis.php
diff --git a/Request.php b/src/Request.php
similarity index 100%
rename from Request.php
rename to src/Request.php
diff --git a/Response.php b/src/Response.php
similarity index 98%
rename from Response.php
rename to src/Response.php
index 2379413..2654c7d 100644
--- a/Response.php
+++ b/src/Response.php
@@ -11,6 +11,8 @@
 
 namespace sergeymakinen\facades;
 
+use yii\helpers\Url;
+
 /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
 /**
  * Yii::$app->get('response') facade.
@@ -318,8 +320,7 @@ protected static function sendFormat($format, $data, array $headers)
         $response->data = $data;
         foreach ($headers as $name => $value) {
             if (strtolower($name) === 'location') {
-                /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
-                $value = \yii\helpers\Url::to($value);
+                $value = Url::to($value);
                 if (strpos($value, '/') === 0 && strpos($value, '//') !== 0) {
                     $value = Request::getHostInfo() . $value;
                 }
diff --git a/Router.php b/src/Router.php
similarity index 100%
rename from Router.php
rename to src/Router.php
diff --git a/Security.php b/src/Security.php
similarity index 100%
rename from Security.php
rename to src/Security.php
diff --git a/Session.php b/src/Session.php
similarity index 100%
rename from Session.php
rename to src/Session.php
diff --git a/Url.php b/src/Url.php
similarity index 100%
rename from Url.php
rename to src/Url.php
diff --git a/User.php b/src/User.php
similarity index 100%
rename from User.php
rename to src/User.php
diff --git a/View.php b/src/View.php
similarity index 100%
rename from View.php
rename to src/View.php
diff --git a/tests/CacheTest.php b/tests/CacheTest.php
new file mode 100644
index 0000000..a8fe321
--- /dev/null
+++ b/tests/CacheTest.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace sergeymakinen\tests;
+
+use sergeymakinen\facades\Cache;
+use sergeymakinen\facades\Facade;
+use yii\caching\FileCache;
+
+class CacheTest extends TestCase
+{
+    protected $key = 'cacheKey';
+
+    protected $default = 'foo';
+
+    protected $value = 'bar';
+
+    public function testCache()
+    {
+        $this->assertEquals(false, Cache::get($this->key));
+        $this->assertEquals($this->value, Cache::cache($this->key, $this->value));
+        $this->assertEquals($this->value, Cache::get($this->key));
+        $this->assertEquals($this->value, Cache::cache($this->key, function () {
+            return $this->default;
+        }));
+        $this->assertEquals($this->value, Cache::get($this->key));
+        Cache::delete($this->key);
+        $this->assertEquals($this->default, Cache::cache($this->key, function () {
+            return $this->default;
+        }));
+        $this->assertEquals($this->default, Cache::get($this->key));
+    }
+
+    public function testGet()
+    {
+        $this->assertEquals(false, Cache::get($this->key));
+        $this->assertEquals($this->default, Cache::get($this->key, $this->default));
+        $this->assertEquals($this->value, Cache::get($this->key, function () {
+            return $this->value;
+        }));
+    }
+
+    protected function setUp()
+    {
+        parent::setUp();
+        $this->createConsoleApplication([
+            'components' => [
+                'cache' => [
+                    'class' => FileCache::class
+                ]
+            ]
+        ]);
+        Facade::setFacadeApplication(\Yii::$app);
+        Cache::flush();
+    }
+}
diff --git a/tests/FacadeTest.php b/tests/FacadeTest.php
new file mode 100644
index 0000000..7bebc2c
--- /dev/null
+++ b/tests/FacadeTest.php
@@ -0,0 +1,194 @@
+<?php
+
+namespace sergeymakinen\tests;
+
+use sergeymakinen\facades\Facade;
+use sergeymakinen\tests\mocks\Component;
+use sergeymakinen\tests\mocks\Component2;
+use sergeymakinen\tests\mocks\Component2Facade;
+use sergeymakinen\tests\mocks\ComponentFacade;
+use yii\base\InvalidConfigException;
+
+class FacadeTest extends TestCase
+{
+    protected $config = [
+        'components' => [
+            'component' => [
+                'class' => Component::class
+            ],
+            'component2' => [
+                'class' => Component2::class
+            ]
+        ]
+    ];
+
+    protected $mappings = [
+        'Asset' => 'assetManager',
+        'Auth' => 'auth',
+        'Cache' => 'cache',
+        'Db' => 'db',
+        'Error' => 'errorHandler',
+        'Formatter' => 'formatter',
+        'Http' => 'httpClient',
+        'I18n' => 'i18n',
+        'Log' => 'log',
+        'Mailer' => 'mailer',
+        'Redis' => 'redis',
+        'Request' => 'request',
+        'Response' => 'response',
+        'Router' => 'urlManager',
+        'Security' => 'security',
+        'Session' => 'session',
+        'Url' => 'urlManager',
+        'User' => 'user',
+        'View' => 'view',
+    ];
+
+    public function testGetFacadeComponentId()
+    {
+        $this->expectException(InvalidConfigException::class);
+        Facade::getFacadeComponentId();
+        $this->assertSame('component', ComponentFacade::getFacadeComponentId());
+        $this->assertSame('component2', Component2Facade::getFacadeComponentId());
+    }
+
+    /**
+     * @covers \sergeymakinen\facades\Facade::clearResolvedFacadeComponent
+     */
+    public function testClearResolvedFacadeComponent()
+    {
+        ComponentFacade::getProperty();
+        ComponentFacade::method();
+        Component2Facade::getProperty();
+        Component2Facade::method();
+        $accessors = $this->getInaccessibleProperty(Facade::class, '_accessors');
+        $components = $this->getInaccessibleProperty(Facade::class, '_components');
+        $this->assertArrayHasKey('component', $accessors);
+        $this->assertArrayHasKey('component2', $accessors);
+        $this->assertArrayHasKey('component', $components);
+        $this->assertArrayHasKey('component2', $components);
+
+        Facade::clearResolvedFacadeComponent('component');
+
+        $accessors = $this->getInaccessibleProperty(Facade::class, '_accessors');
+        $components = $this->getInaccessibleProperty(Facade::class, '_components');
+        $this->assertArrayNotHasKey('component', $accessors);
+        $this->assertArrayHasKey('component2', $accessors);
+        $this->assertArrayNotHasKey('component', $components);
+        $this->assertArrayHasKey('component2', $components);
+    }
+
+    public function testClearResolvedFacadeComponents()
+    {
+        ComponentFacade::getProperty();
+        ComponentFacade::method();
+        Component2Facade::getProperty();
+        Component2Facade::method();
+        $accessors = $this->getInaccessibleProperty(Facade::class, '_accessors');
+        $components = $this->getInaccessibleProperty(Facade::class, '_components');
+        $this->assertArrayHasKey('component', $accessors);
+        $this->assertArrayHasKey('component2', $accessors);
+        $this->assertArrayHasKey('component', $components);
+        $this->assertArrayHasKey('component2', $components);
+
+        Facade::clearResolvedFacadeComponents();
+
+        $accessors = $this->getInaccessibleProperty(Facade::class, '_accessors');
+        $components = $this->getInaccessibleProperty(Facade::class, '_components');
+        $this->assertEmpty($accessors);
+        $this->assertEmpty($components);
+    }
+
+    public function testGetFacadeComponent()
+    {
+        $this->assertSame(\Yii::$app->get('component'), ComponentFacade::getFacadeComponent());
+        $this->assertSame(\Yii::$app->get('component2'), Component2Facade::getFacadeComponent());
+    }
+
+    public function testGetFacadeApplication()
+    {
+        $this->setInaccessibleProperty(Facade::class, '_app', null);
+        $this->assertSame(\Yii::$app, ComponentFacade::getFacadeApplication());
+    }
+
+    public function testSetFacadeApplication()
+    {
+        $this->assertEquals(\Yii::$app, ComponentFacade::getFacadeApplication());
+        ComponentFacade::getProperty();
+        ComponentFacade::method();
+        Component2Facade::getProperty();
+        Component2Facade::method();
+        $accessors = $this->getInaccessibleProperty(Facade::class, '_accessors');
+        $components = $this->getInaccessibleProperty(Facade::class, '_components');
+        $this->assertArrayHasKey('component', $accessors);
+        $this->assertArrayHasKey('component2', $accessors);
+        $this->assertArrayHasKey('component', $components);
+        $this->assertArrayHasKey('component2', $components);
+
+        $component = \Yii::$app->get('component');
+        $component2 = \Yii::$app->get('component2');
+        $oldApp = \Yii::$app;
+        $this->createConsoleApplication($this->config);
+        $this->assertNotSame(\Yii::$app, $oldApp);
+        $this->assertSame($oldApp, Facade::getFacadeApplication());
+        $this->assertNotSame(\Yii::$app, Facade::getFacadeApplication());
+        
+        Facade::setFacadeApplication(\Yii::$app);
+        $accessors = $this->getInaccessibleProperty(Facade::class, '_accessors');
+        $components = $this->getInaccessibleProperty(Facade::class, '_components');
+        $this->assertEmpty($accessors);
+        $this->assertEmpty($components);
+        $this->assertSame(\Yii::$app->get('component'), ComponentFacade::getFacadeComponent());
+        $this->assertSame(\Yii::$app->get('component2'), Component2Facade::getFacadeComponent());
+        $this->assertNotSame($component, ComponentFacade::getFacadeComponent());
+        $this->assertNotSame($component2, Component2Facade::getFacadeComponent());
+
+        $this->destroyApplication();
+        \Yii::$app = $oldApp;
+        Facade::setFacadeApplication(\Yii::$app);
+        $this->assertSame(\Yii::$app->get('component'), ComponentFacade::getFacadeComponent());
+        $this->assertSame(\Yii::$app->get('component2'), Component2Facade::getFacadeComponent());
+        $this->assertSame($component, ComponentFacade::getFacadeComponent());
+        $this->assertSame($component2, Component2Facade::getFacadeComponent());
+    }
+
+    public function testCallStatic()
+    {
+        /** @var Component $component */
+        $component = \Yii::$app->get('component');
+        $this->assertEquals($component->property, ComponentFacade::getProperty());
+
+        $newValue = 'foo';
+        $component->property = $newValue;
+        $this->assertEquals($component->property, ComponentFacade::getProperty());
+
+        $newValue = 'bar';
+        ComponentFacade::setProperty($newValue);
+        $this->assertEquals(ComponentFacade::getProperty(), $component->property);
+
+        $this->assertEquals($newValue, ComponentFacade::method($newValue));
+    }
+
+    public function testPrivateConstruction()
+    {
+        $this->assertFalse((new \ReflectionMethod(ComponentFacade::class, '__construct'))->isPublic());
+        $this->assertFalse((new \ReflectionMethod(ComponentFacade::class, '__clone'))->isPublic());
+        $this->assertFalse((new \ReflectionMethod(ComponentFacade::class, '__wakeup'))->isPublic());
+    }
+
+    public function testMappings()
+    {
+        foreach ($this->mappings as $className => $id) {
+            /** @var Facade $class */
+            $class = 'sergeymakinen\facades\\' . $className;
+            $this->assertEquals($id, $class::getFacadeComponentId());
+        }
+    }
+
+    protected function setUp()
+    {
+        parent::setUp();
+        $this->createConsoleApplication($this->config);
+        Facade::setFacadeApplication(\Yii::$app);
+    }
+}
diff --git a/tests/ResponseTest.php b/tests/ResponseTest.php
new file mode 100644
index 0000000..5e16ff9
--- /dev/null
+++ b/tests/ResponseTest.php
@@ -0,0 +1,82 @@
+<?php
+
+namespace sergeymakinen\tests;
+
+use sergeymakinen\facades\Facade;
+use sergeymakinen\facades\Response;
+use yii\helpers\Url;
+
+class ResponseTest extends TestCase
+{
+    protected $headers = [
+        'foo' => 'bar',
+        'location' => '/'
+    ];
+
+    protected $data = [
+        'foo' => 'bar',
+        'bar' => 'foo'
+    ];
+
+    public function testBare()
+    {
+        $response = Response::bare(204, $this->headers);
+        $this->assertEquals(204, $response->statusCode);
+        $this->checkResponse($response, \yii\web\Response::FORMAT_RAW, null);
+    }
+
+    public function testHtml()
+    {
+        $response = Response::html($this->data, $this->headers);
+        $this->checkResponse($response, \yii\web\Response::FORMAT_HTML, $this->data);
+    }
+
+    public function testJson()
+    {
+        $response = Response::json($this->data, $this->headers);
+        $this->checkResponse($response, \yii\web\Response::FORMAT_JSON, $this->data);
+    }
+
+    public function testJsonp()
+    {
+        $response = Response::jsonp($this->data, 'foobar', $this->headers);
+        $this->checkResponse($response, \yii\web\Response::FORMAT_JSONP, [
+            'callback' => 'foobar',
+            'data' => $this->data
+        ]);
+    }
+
+    public function testRaw()
+    {
+        $response = Response::raw($this->data, $this->headers);
+        $this->checkResponse($response, \yii\web\Response::FORMAT_RAW, $this->data);
+    }
+
+    public function testXml()
+    {
+        $response = Response::xml($this->data, $this->headers);
+        $this->checkResponse($response, \yii\web\Response::FORMAT_XML, $this->data);
+    }
+
+    protected function setUp()
+    {
+        parent::setUp();
+        $this->createWebApplication();
+        Facade::setFacadeApplication(\Yii::$app);
+    }
+
+    protected function checkResponse(\yii\web\Response $response, $format, $data)
+    {
+        $this->assertEquals($format, $response->format);
+        $this->assertSame($data, $response->data);
+        foreach ($this->headers as $name => $value) {
+            $this->assertTrue($response->headers->has($name));
+            if ($name === 'location') {
+                $value = \Yii::$app->request->getHostInfo() . Url::to($value);
+                $this->assertEquals($value, $response->headers->get($name));
+            } else {
+                $this->assertEquals($value, $response->headers->get($name));
+            }
+        }
+    }
+}
diff --git a/tests/TestCase.php b/tests/TestCase.php
new file mode 100644
index 0000000..9ac3981
--- /dev/null
+++ b/tests/TestCase.php
@@ -0,0 +1,120 @@
+<?php
+
+namespace sergeymakinen\tests;
+
+use yii\helpers\ArrayHelper;
+
+abstract class TestCase extends \PHPUnit_Framework_TestCase
+{
+    protected function tearDown()
+    {
+        parent::tearDown();
+        $this->destroyApplication();
+    }
+
+    protected function createConsoleApplication($config = [], $class = \yii\console\Application::class)
+    {
+        new $class(ArrayHelper::merge([
+            'id' => 'console-test',
+            'basePath' => __DIR__,
+            'vendorPath' => __DIR__ . '/../vendor',
+        ], $config));
+    }
+
+    protected function createWebApplication($config = [], $class = \yii\web\Application::class)
+    {
+        new $class(ArrayHelper::merge([
+            'id' => 'web-test',
+            'basePath' => __DIR__,
+            'vendorPath' => __DIR__ . '/../vendor',
+            'components' => [
+                'request' => [
+                    'enableCookieValidation' => false,
+                    'scriptFile' => __DIR__ . '/index.php',
+                    'scriptUrl' => '/index.php',
+                ],
+            ]
+        ], $config));
+    }
+
+    protected function destroyApplication()
+    {
+        if (!isset(\Yii::$app)) {
+            return;
+        }
+
+        if (\Yii::$app->has('session', true)) {
+            \Yii::$app->session->close();
+        }
+        \Yii::$app = null;
+    }
+
+    /**
+     * @param object|string $object
+     * @param string $name
+     *
+     * @return \ReflectionProperty
+     */
+    protected function getProperty($object, $name)
+    {
+        $class = new \ReflectionClass($object);
+        while (!$class->hasProperty($name)) {
+            $class = $class->getParentClass();
+        }
+        return $class->getProperty($name);
+    }
+
+    /**
+     * @param object|string $object
+     * @param string $name
+     *
+     * @return \ReflectionMethod
+     */
+    protected function getMethod($object, $name)
+    {
+        $class = new \ReflectionClass($object);
+        while (!$class->hasMethod($name)) {
+            $class = $class->getParentClass();
+        }
+        return $class->getMethod($name);
+    }
+
+    /**
+     * @param object|string $object
+     * @param string $name
+     *
+     * @return mixed
+     */
+    protected function getInaccessibleProperty($object, $name)
+    {
+        $property = $this->getProperty($object, $name);
+        $property->setAccessible(true);
+        return $property->getValue($object);
+    }
+
+    /**
+     * @param object|string $object
+     * @param string $name
+     * @param mixed $value
+     */
+    protected function setInaccessibleProperty($object, $name, $value)
+    {
+        $property = $this->getProperty($object, $name);
+        $property->setAccessible(true);
+        $property->setValue($value);
+    }
+
+    /**
+     * @param object|string $object
+     * @param string $name
+     * @param array $args
+     *
+     * @return mixed
+     */
+    protected function invokeInaccessibleMethod($object, $name, array $args = [])
+    {
+        $method = $this->getMethod($object, $name);
+        $method->setAccessible(true);
+        return $method->invokeArgs($object, $args);
+    }
+}
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
new file mode 100644
index 0000000..8f67a47
--- /dev/null
+++ b/tests/bootstrap.php
@@ -0,0 +1,20 @@
+<?php
+
+error_reporting(-1);
+ini_set('display_errors', true);
+
+require_once __DIR__ . '/../vendor/autoload.php';
+$loader = new Composer\Autoload\ClassLoader();
+$loader->addPsr4('sergeymakinen\tests\\', __DIR__, true);
+$loader->register();
+
+$_SERVER['SCRIPT_FILENAME'] = __FILE__;
+$_SERVER['SCRIPT_NAME'] = '/index.php';
+$_SERVER['SERVER_NAME'] = 'example.com';
+
+define('YII_DEBUG', true);
+define('YII_ENABLE_ERROR_HANDLER', false);
+
+require_once __DIR__ . '/../vendor/yiisoft/yii2/Yii.php';
+
+require_once __DIR__ . '/TestCase.php';
diff --git a/tests/mocks/Component.php b/tests/mocks/Component.php
new file mode 100644
index 0000000..a2035b6
--- /dev/null
+++ b/tests/mocks/Component.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace sergeymakinen\tests\mocks;
+
+class Component
+{
+    public $property = 'value';
+
+    public function method($input = null)
+    {
+        return $input;
+    }
+}
diff --git a/tests/mocks/Component2.php b/tests/mocks/Component2.php
new file mode 100644
index 0000000..e82e8cb
--- /dev/null
+++ b/tests/mocks/Component2.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace sergeymakinen\tests\mocks;
+
+class Component2 extends Component
+{
+}
diff --git a/tests/mocks/Component2Facade.php b/tests/mocks/Component2Facade.php
new file mode 100644
index 0000000..626c4f4
--- /dev/null
+++ b/tests/mocks/Component2Facade.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace sergeymakinen\tests\mocks;
+
+class Component2Facade extends ComponentFacade
+{
+    public static function getFacadeComponentId()
+    {
+        return 'component2';
+    }
+}
diff --git a/tests/mocks/ComponentFacade.php b/tests/mocks/ComponentFacade.php
new file mode 100644
index 0000000..2a55e77
--- /dev/null
+++ b/tests/mocks/ComponentFacade.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace sergeymakinen\tests\mocks;
+
+use sergeymakinen\facades\Facade;
+
+/**
+ * @method static mixed method(mixed $input = null)
+ * @method static mixed getProperty()
+ * @method static void setProperty(mixed $value)
+ */
+class ComponentFacade extends Facade
+{
+    public static function getFacadeComponentId()
+    {
+        return 'component';
+    }
+}