diff --git a/.env.test b/.env.test
new file mode 100644
index 0000000..fb4a966
--- /dev/null
+++ b/.env.test
@@ -0,0 +1,9 @@
+# define your env variables for the test env here
+APP_ENV=test
+
+KERNEL_CLASS='App\Kernel'
+APP_SECRET='$ecretf0rt3st'
+SYMFONY_DEPRECATIONS_HELPER=999999
+PANTHER_APP_ENV=panther
+
+DATA_PATH=var/data/test-data
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index be98836..90789e4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
-
 ###> symfony/framework-bundle ###
 /.env.local
 /.env.local.php
@@ -9,3 +8,9 @@
 /var/
 /vendor/
 ###< symfony/framework-bundle ###
+
+###> symfony/phpunit-bridge ###
+.phpunit
+.phpunit.result.cache
+/phpunit.xml
+###< symfony/phpunit-bridge ###
diff --git a/bin/phpunit b/bin/phpunit
new file mode 100755
index 0000000..4d1ed05
--- /dev/null
+++ b/bin/phpunit
@@ -0,0 +1,13 @@
+#!/usr/bin/env php
+<?php
+
+if (!file_exists(dirname(__DIR__).'/vendor/symfony/phpunit-bridge/bin/simple-phpunit.php')) {
+    echo "Unable to find the `simple-phpunit.php` script in `vendor/symfony/phpunit-bridge/bin/`.\n";
+    exit(1);
+}
+
+if (false === getenv('SYMFONY_PHPUNIT_DIR')) {
+    putenv('SYMFONY_PHPUNIT_DIR='.__DIR__.'/.phpunit');
+}
+
+require dirname(__DIR__).'/vendor/symfony/phpunit-bridge/bin/simple-phpunit.php';
diff --git a/composer.json b/composer.json
index b2f9664..a459c71 100644
--- a/composer.json
+++ b/composer.json
@@ -18,6 +18,9 @@
         "symfony/yaml": "4.4.*"
     },
     "require-dev": {
+        "symfony/browser-kit": "^4.4",
+        "symfony/css-selector": "^4.4",
+        "symfony/phpunit-bridge": "^5.1"
     },
     "config": {
         "preferred-install": {
diff --git a/composer.lock b/composer.lock
index 314728b..a4a06b7 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "d13298efad86d6465db4ec7e91b0ec4a",
+    "content-hash": "54d4b69714e36881377a0e03116ae9e5",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
@@ -3113,7 +3113,305 @@
             "time": "2020-08-26T08:30:46+00:00"
         }
     ],
-    "packages-dev": [],
+    "packages-dev": [
+        {
+            "name": "symfony/browser-kit",
+            "version": "v4.4.15",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/browser-kit.git",
+                "reference": "9a1786e5020783605a30cff2ceed9aca030e8d80"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/browser-kit/zipball/9a1786e5020783605a30cff2ceed9aca030e8d80",
+                "reference": "9a1786e5020783605a30cff2ceed9aca030e8d80",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1.3",
+                "symfony/dom-crawler": "^3.4|^4.0|^5.0"
+            },
+            "require-dev": {
+                "symfony/css-selector": "^3.4|^4.0|^5.0",
+                "symfony/http-client": "^4.3|^5.0",
+                "symfony/mime": "^4.3|^5.0",
+                "symfony/process": "^3.4|^4.0|^5.0"
+            },
+            "suggest": {
+                "symfony/process": ""
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.4-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\BrowserKit\\": ""
+                },
+                "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 BrowserKit Component",
+            "homepage": "https://symfony.com",
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-10-02T08:38:15+00:00"
+        },
+        {
+            "name": "symfony/css-selector",
+            "version": "v4.4.15",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/css-selector.git",
+                "reference": "bf17dc9f6ce144e41f786c32435feea4d8e11dcc"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/css-selector/zipball/bf17dc9f6ce144e41f786c32435feea4d8e11dcc",
+                "reference": "bf17dc9f6ce144e41f786c32435feea4d8e11dcc",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.4-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\CssSelector\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Jean-François Simon",
+                    "email": "jeanfrancois.simon@sensiolabs.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony CssSelector Component",
+            "homepage": "https://symfony.com",
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-07-05T09:39:30+00:00"
+        },
+        {
+            "name": "symfony/dom-crawler",
+            "version": "v4.4.15",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/dom-crawler.git",
+                "reference": "bdcb7633a501770a0daefbf81d2e6b28c3864f2b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/dom-crawler/zipball/bdcb7633a501770a0daefbf81d2e6b28c3864f2b",
+                "reference": "bdcb7633a501770a0daefbf81d2e6b28c3864f2b",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1.3",
+                "symfony/polyfill-ctype": "~1.8",
+                "symfony/polyfill-mbstring": "~1.0"
+            },
+            "conflict": {
+                "masterminds/html5": "<2.6"
+            },
+            "require-dev": {
+                "masterminds/html5": "^2.6",
+                "symfony/css-selector": "^3.4|^4.0|^5.0"
+            },
+            "suggest": {
+                "symfony/css-selector": ""
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.4-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\DomCrawler\\": ""
+                },
+                "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 DomCrawler Component",
+            "homepage": "https://symfony.com",
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-10-02T07:34:48+00:00"
+        },
+        {
+            "name": "symfony/phpunit-bridge",
+            "version": "v5.1.7",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/phpunit-bridge.git",
+                "reference": "150aeb91dd9dafe13ec8416abd62e435330ca12d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/phpunit-bridge/zipball/150aeb91dd9dafe13ec8416abd62e435330ca12d",
+                "reference": "150aeb91dd9dafe13ec8416abd62e435330ca12d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5.9"
+            },
+            "conflict": {
+                "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0|<6.4,>=6.0|9.1.2"
+            },
+            "require-dev": {
+                "symfony/deprecation-contracts": "^2.1"
+            },
+            "suggest": {
+                "symfony/error-handler": "For tracking deprecated interfaces usages at runtime with DebugClassLoader"
+            },
+            "bin": [
+                "bin/simple-phpunit"
+            ],
+            "type": "symfony-bridge",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.1-dev"
+                },
+                "thanks": {
+                    "name": "phpunit/phpunit",
+                    "url": "https://github.com/sebastianbergmann/phpunit"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Bridge\\PhpUnit\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony PHPUnit Bridge",
+            "homepage": "https://symfony.com",
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-10-02T12:57:56+00:00"
+        }
+    ],
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": [],
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
new file mode 100644
index 0000000..d81f0c3
--- /dev/null
+++ b/phpunit.xml.dist
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!-- https://phpunit.readthedocs.io/en/latest/configuration.html -->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="bin/.phpunit/phpunit.xsd"
+         backupGlobals="false"
+         colors="true"
+         bootstrap="tests/bootstrap.php"
+>
+    <php>
+        <ini name="error_reporting" value="-1" />
+        <server name="APP_ENV" value="test" force="true" />
+        <server name="SHELL_VERBOSITY" value="-1" />
+        <server name="SYMFONY_PHPUNIT_REMOVE" value="" />
+        <server name="SYMFONY_PHPUNIT_VERSION" value="7.5" />
+    </php>
+
+    <testsuites>
+        <testsuite name="Project Test Suite">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">src</directory>
+        </whitelist>
+    </filter>
+
+    <listeners>
+        <listener class="Symfony\Bridge\PhpUnit\SymfonyTestsListener" />
+    </listeners>
+</phpunit>
diff --git a/src/Repository/Question/QuestionRepository.php b/src/Repository/Question/QuestionRepository.php
index 22be3c6..1f258e4 100644
--- a/src/Repository/Question/QuestionRepository.php
+++ b/src/Repository/Question/QuestionRepository.php
@@ -33,14 +33,18 @@ public function __construct(StorageInterface $storage, DataFormatterInterface $f
     public function getAll(): QuestionCollection
     {
         $questionsData = $this->storage->get();
-
+        if (null === $questionsData) {
+            return new QuestionCollection();
+        }
         return $this->formatter->getCollectionFromStorageFormat($questionsData);
     }
 
     public function storeOne(AbstractQuestion $question): AbstractQuestion
     {
         $storedData = $this->storage->get();
-        $questions = $storedData ? $this->formatter->getCollectionFromStorageFormat($storedData) : new QuestionCollection();
+        $questions = $storedData ? $this->formatter->getCollectionFromStorageFormat(
+            $storedData
+        ) : new QuestionCollection();
 
         $questions->add($question);
 
diff --git a/symfony.lock b/symfony.lock
index 8d37d98..689b23e 100644
--- a/symfony.lock
+++ b/symfony.lock
@@ -53,6 +53,9 @@
     "stichoza/google-translate-php": {
         "version": "v4.1.1"
     },
+    "symfony/browser-kit": {
+        "version": "v4.4.15"
+    },
     "symfony/cache": {
         "version": "v4.4.13"
     },
@@ -75,12 +78,18 @@
             "config/bootstrap.php"
         ]
     },
+    "symfony/css-selector": {
+        "version": "v4.4.15"
+    },
     "symfony/debug": {
         "version": "v4.4.13"
     },
     "symfony/dependency-injection": {
         "version": "v4.4.13"
     },
+    "symfony/dom-crawler": {
+        "version": "v4.4.15"
+    },
     "symfony/dotenv": {
         "version": "v4.4.13"
     },
@@ -140,6 +149,21 @@
     "symfony/mime": {
         "version": "v4.4.13"
     },
+    "symfony/phpunit-bridge": {
+        "version": "4.3",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "master",
+            "version": "4.3",
+            "ref": "6d0e35f749d5f4bfe1f011762875275cd3f9874f"
+        },
+        "files": [
+            ".env.test",
+            "bin/phpunit",
+            "phpunit.xml.dist",
+            "tests/bootstrap.php"
+        ]
+    },
     "symfony/polyfill-intl-idn": {
         "version": "v1.18.1"
     },
@@ -178,6 +202,9 @@
     "symfony/service-contracts": {
         "version": "v2.2.0"
     },
+    "symfony/test-pack": {
+        "version": "v1.0.6"
+    },
     "symfony/var-dumper": {
         "version": "v4.4.13"
     },
diff --git a/tests/Functional/Controller/QuestionsControllerTest.php b/tests/Functional/Controller/QuestionsControllerTest.php
new file mode 100644
index 0000000..38937fb
--- /dev/null
+++ b/tests/Functional/Controller/QuestionsControllerTest.php
@@ -0,0 +1,38 @@
+<?php
+
+
+namespace App\Tests\Functional\Controller;
+
+use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+
+class QuestionsControllerTest extends WebTestCase
+{
+    public function testGetAction()
+    {
+        static::createClient()->request('GET', '/questions');
+
+        $this->assertResponseStatusCodeSame(200);
+        $this->assertResponseHeaderSame('content-type', 'application/json');
+    }
+
+    public function testPostActionValidData()
+    {
+        /* Todo move it to parent class */
+        $json = file_get_contents(__DIR__ . '/../../fixtures/questionValidPostData.json');
+        $client = static::createClient();
+        $client->request('POST', '/question', [], [], [], $json);
+
+        $this->assertResponseStatusCodeSame(200);
+        $this->assertResponseHeaderSame('content-type', 'application/json');
+        $this->assertJsonStringEqualsJsonString($client->getResponse()->getContent(), $json);
+    }
+
+    public function testPostActionInvalidData()
+    {
+        $json = file_get_contents(__DIR__ . '/../../fixtures/questionInvalidPostData.json');
+        $client = static::createClient();
+        $client->request('POST', '/question', [], [], [], $json);
+
+        $this->assertResponseStatusCodeSame(400);
+    }
+}
\ No newline at end of file
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
new file mode 100644
index 0000000..469dcce
--- /dev/null
+++ b/tests/bootstrap.php
@@ -0,0 +1,11 @@
+<?php
+
+use Symfony\Component\Dotenv\Dotenv;
+
+require dirname(__DIR__).'/vendor/autoload.php';
+
+if (file_exists(dirname(__DIR__).'/config/bootstrap.php')) {
+    require dirname(__DIR__).'/config/bootstrap.php';
+} elseif (method_exists(Dotenv::class, 'bootEnv')) {
+    (new Dotenv())->bootEnv(dirname(__DIR__).'/.env');
+}
diff --git a/tests/fixtures/questionInvalidPostData.json b/tests/fixtures/questionInvalidPostData.json
new file mode 100644
index 0000000..f62e74c
--- /dev/null
+++ b/tests/fixtures/questionInvalidPostData.json
@@ -0,0 +1,12 @@
+{
+  "text": "What does mean O.A.T. ?",
+  "createdAt": "2019-06-02 00:00:00",
+  "choices": [
+    {
+      "text": "Open Assessment Technologies"
+    },
+    {
+      "text": "Open Acknowledgment Technologies"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/tests/fixtures/questionValidPostData.json b/tests/fixtures/questionValidPostData.json
new file mode 100644
index 0000000..ee748ae
--- /dev/null
+++ b/tests/fixtures/questionValidPostData.json
@@ -0,0 +1,15 @@
+{
+  "text": "What does mean O.A.T. ?",
+  "createdAt": "2019-06-02 00:00:00",
+  "choices": [
+    {
+      "text": "Open Assignment Technologies"
+    },
+    {
+      "text": "Open Assessment Technologies"
+    },
+    {
+      "text": "Open Acknowledgment Technologies"
+    }
+  ]
+}
\ No newline at end of file