diff --git a/api/.env.test b/api/.env.test
new file mode 100644
index 0000000000000000000000000000000000000000..d0486867ed386d60931f80353f41aaef61974081
--- /dev/null
+++ b/api/.env.test
@@ -0,0 +1,5 @@
+# define your env variables for the test env here
+KERNEL_CLASS='App\Kernel'
+APP_SECRET='$ecretf0rt3st'
+SYMFONY_DEPRECATIONS_HELPER=999999
+PANTHER_APP_ENV=panther
diff --git a/api/.gitignore b/api/.gitignore
index c05dd56c07c3431e9799d03e92056d9850b1d43a..8f66341d467ef628f5dbd77973fa6f7828d08847 100644
--- a/api/.gitignore
+++ b/api/.gitignore
@@ -14,3 +14,9 @@
 /.php_cs
 /.php_cs.cache
 ###< friendsofphp/php-cs-fixer ###
+
+###> symfony/phpunit-bridge ###
+.phpunit
+.phpunit.result.cache
+/phpunit.xml
+###< symfony/phpunit-bridge ###
diff --git a/api/bin/phpunit b/api/bin/phpunit
new file mode 100755
index 0000000000000000000000000000000000000000..4d1ed05d3c5434e3da54cd09b150d5904ac3e79f
--- /dev/null
+++ b/api/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/api/composer.json b/api/composer.json
index 68b8230c28582ac693eef8356803d0e41dbd10fc..6592755698feec78546c5034ddd9e12ae8d23bcc 100644
--- a/api/composer.json
+++ b/api/composer.json
@@ -17,8 +17,11 @@
     "require-dev": {
         "api-platform/schema-generator": "^2.1",
         "doctrine/doctrine-fixtures-bundle": "^3.3",
+        "justinrainbow/json-schema": "^5.2",
+        "symfony/http-client": "4.3.*",
         "symfony/maker-bundle": "^1.11",
-        "symfony/profiler-pack": "^1.0"
+        "symfony/profiler-pack": "^1.0",
+        "symfony/test-pack": "^1.0"
     },
     "conflict": {
         "symfony/symfony": "*"
diff --git a/api/composer.lock b/api/composer.lock
index 970ed9dc2d0c61b5de09b08cbe417b59eb6be40f..993a99260b1ae5c6321b141c371ead9601291a08 100644
--- a/api/composer.lock
+++ b/api/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": "eef8f519a5922cc8e8751172a04b0948",
+    "content-hash": "549348049e77f9a8db31f7dbef31f8e1",
     "packages": [
         {
             "name": "api-platform/api-pack",
@@ -3286,23 +3286,24 @@
         },
         {
             "name": "symfony/http-client",
-            "version": "v4.3.8",
+            "version": "v4.3.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/http-client.git",
-                "reference": "ae3a9cd491f1aadb5583f34a6bda5cca34081ce8"
+                "reference": "8d25d5816b33c7c5cde0d557af31c924e68d4fb9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/http-client/zipball/ae3a9cd491f1aadb5583f34a6bda5cca34081ce8",
-                "reference": "ae3a9cd491f1aadb5583f34a6bda5cca34081ce8",
+                "url": "https://api.github.com/repos/symfony/http-client/zipball/8d25d5816b33c7c5cde0d557af31c924e68d4fb9",
+                "reference": "8d25d5816b33c7c5cde0d557af31c924e68d4fb9",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.1.3",
                 "psr/log": "^1.0",
                 "symfony/http-client-contracts": "^1.1.7",
-                "symfony/polyfill-php73": "^1.11"
+                "symfony/polyfill-php73": "^1.11",
+                "symfony/service-contracts": "^1.0|^2"
             },
             "provide": {
                 "psr/http-client-implementation": "1.0",
@@ -3344,7 +3345,7 @@
             ],
             "description": "Symfony HttpClient component",
             "homepage": "https://symfony.com",
-            "time": "2019-11-08T08:23:45+00:00"
+            "time": "2019-11-28T14:09:27+00:00"
         },
         {
             "name": "symfony/http-client-contracts",
@@ -6023,6 +6024,72 @@
             "description": "A tool to automatically fix PHP code style",
             "time": "2019-11-03T13:31:09+00:00"
         },
+        {
+            "name": "justinrainbow/json-schema",
+            "version": "5.2.9",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/justinrainbow/json-schema.git",
+                "reference": "44c6787311242a979fa15c704327c20e7221a0e4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/justinrainbow/json-schema/zipball/44c6787311242a979fa15c704327c20e7221a0e4",
+                "reference": "44c6787311242a979fa15c704327c20e7221a0e4",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "~2.2.20||~2.15.1",
+                "json-schema/json-schema-test-suite": "1.2.0",
+                "phpunit/phpunit": "^4.8.35"
+            },
+            "bin": [
+                "bin/validate-json"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "JsonSchema\\": "src/JsonSchema/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bruno Prieto Reis",
+                    "email": "bruno.p.reis@gmail.com"
+                },
+                {
+                    "name": "Justin Rainbow",
+                    "email": "justin.rainbow@gmail.com"
+                },
+                {
+                    "name": "Igor Wiedler",
+                    "email": "igor@wiedler.ch"
+                },
+                {
+                    "name": "Robert Schönthal",
+                    "email": "seroscho@googlemail.com"
+                }
+            ],
+            "description": "A library to validate a json schema.",
+            "homepage": "https://github.com/justinrainbow/json-schema",
+            "keywords": [
+                "json",
+                "schema"
+            ],
+            "time": "2019-09-25T14:49:45+00:00"
+        },
         {
             "name": "league/html-to-markdown",
             "version": "4.9.0",
@@ -6190,6 +6257,179 @@
             ],
             "time": "2018-02-15T16:58:55+00:00"
         },
+        {
+            "name": "symfony/browser-kit",
+            "version": "v4.3.9",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/browser-kit.git",
+                "reference": "b14fa08508afd152257d5dcc7adb5f278654d972"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/browser-kit/zipball/b14fa08508afd152257d5dcc7adb5f278654d972",
+                "reference": "b14fa08508afd152257d5dcc7adb5f278654d972",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1.3",
+                "symfony/dom-crawler": "~3.4|~4.0"
+            },
+            "require-dev": {
+                "symfony/css-selector": "~3.4|~4.0",
+                "symfony/http-client": "^4.3",
+                "symfony/mime": "^4.3",
+                "symfony/process": "~3.4|~4.0"
+            },
+            "suggest": {
+                "symfony/process": ""
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.3-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",
+            "time": "2019-10-28T17:07:32+00:00"
+        },
+        {
+            "name": "symfony/css-selector",
+            "version": "v4.3.9",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/css-selector.git",
+                "reference": "f4b3ff6a549d9ed28b2b0ecd1781bf67cf220ee9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/css-selector/zipball/f4b3ff6a549d9ed28b2b0ecd1781bf67cf220ee9",
+                "reference": "f4b3ff6a549d9ed28b2b0ecd1781bf67cf220ee9",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.3-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",
+            "time": "2019-10-02T08:36:26+00:00"
+        },
+        {
+            "name": "symfony/dom-crawler",
+            "version": "v4.3.9",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/dom-crawler.git",
+                "reference": "4b9efd5708c3a38593e19b6a33e40867f4f89d72"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/dom-crawler/zipball/4b9efd5708c3a38593e19b6a33e40867f4f89d72",
+                "reference": "4b9efd5708c3a38593e19b6a33e40867f4f89d72",
+                "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"
+            },
+            "suggest": {
+                "symfony/css-selector": ""
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.3-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",
+            "time": "2019-10-28T17:07:32+00:00"
+        },
         {
             "name": "symfony/maker-bundle",
             "version": "v1.14.3",
@@ -6312,6 +6552,71 @@
             ],
             "time": "2019-10-28T20:59:01+00:00"
         },
+        {
+            "name": "symfony/phpunit-bridge",
+            "version": "v5.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/phpunit-bridge.git",
+                "reference": "010cf42a81e7bec744edfdef5f76d6394f4906a7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/phpunit-bridge/zipball/010cf42a81e7bec744edfdef5f76d6394f4906a7",
+                "reference": "010cf42a81e7bec744edfdef5f76d6394f4906a7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5.9"
+            },
+            "conflict": {
+                "phpunit/phpunit": "<5.4.3"
+            },
+            "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": "5.0-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",
+            "time": "2019-11-28T14:20:16+00:00"
+        },
         {
             "name": "symfony/process",
             "version": "v4.3.8",
@@ -6389,6 +6694,34 @@
             "description": "A pack for the Symfony web profiler",
             "time": "2018-12-10T12:11:44+00:00"
         },
+        {
+            "name": "symfony/test-pack",
+            "version": "v1.0.6",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/test-pack.git",
+                "reference": "ff87e800a67d06c423389f77b8209bc9dc469def"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/test-pack/zipball/ff87e800a67d06c423389f77b8209bc9dc469def",
+                "reference": "ff87e800a67d06c423389f77b8209bc9dc469def",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0",
+                "symfony/browser-kit": "*",
+                "symfony/css-selector": "*",
+                "symfony/phpunit-bridge": "*"
+            },
+            "type": "symfony-pack",
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "A pack for functional and end-to-end testing within a Symfony app",
+            "time": "2019-06-21T06:27:32+00:00"
+        },
         {
             "name": "symfony/var-dumper",
             "version": "v4.3.8",
diff --git a/api/phpunit.xml.dist b/api/phpunit.xml.dist
new file mode 100644
index 0000000000000000000000000000000000000000..5b7c82022104a0bda3efc1ea5d1d55fca4bd5132
--- /dev/null
+++ b/api/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="config/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>
+            <directory>src</directory>
+        </whitelist>
+    </filter>
+
+    <listeners>
+        <listener class="Symfony\Bridge\PhpUnit\SymfonyTestsListener" />
+    </listeners>
+</phpunit>
diff --git a/api/symfony.lock b/api/symfony.lock
index 55a3eb5820d66891d23f09f0eefad1268a24b849..1607aea62f4d612ba07fb7fd684c4206ad580eb1 100644
--- a/api/symfony.lock
+++ b/api/symfony.lock
@@ -149,6 +149,9 @@
     "jdorn/sql-formatter": {
         "version": "v1.2.17"
     },
+    "justinrainbow/json-schema": {
+        "version": "5.2.9"
+    },
     "league/html-to-markdown": {
         "version": "4.9.0"
     },
@@ -209,6 +212,9 @@
     "symfony/asset": {
         "version": "v4.3.8"
     },
+    "symfony/browser-kit": {
+        "version": "v4.3.9"
+    },
     "symfony/cache": {
         "version": "v4.3.8"
     },
@@ -231,6 +237,9 @@
             "config/bootstrap.php"
         ]
     },
+    "symfony/css-selector": {
+        "version": "v4.3.9"
+    },
     "symfony/debug": {
         "version": "v4.3.8"
     },
@@ -240,6 +249,9 @@
     "symfony/doctrine-bridge": {
         "version": "v4.3.8"
     },
+    "symfony/dom-crawler": {
+        "version": "v4.3.9"
+    },
     "symfony/dotenv": {
         "version": "v4.3.8"
     },
@@ -334,6 +346,22 @@
     "symfony/options-resolver": {
         "version": "v4.3.8"
     },
+    "symfony/phpunit-bridge": {
+        "version": "4.3",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "master",
+            "version": "4.3",
+            "ref": "170be6250b77b421f02e986e2853df86c7bd6516"
+        },
+        "files": [
+            ".env.test",
+            "bin/phpunit",
+            "config/bootstrap.php",
+            "phpunit.xml.dist",
+            "tests/.gitignore"
+        ]
+    },
     "symfony/polyfill-intl-idn": {
         "version": "v1.12.0"
     },
@@ -405,6 +433,9 @@
     "symfony/stopwatch": {
         "version": "v4.3.8"
     },
+    "symfony/test-pack": {
+        "version": "v1.0.6"
+    },
     "symfony/translation-contracts": {
         "version": "v1.1.7"
     },
diff --git a/api/tests/.gitignore b/api/tests/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/api/tests/AnalyticsTest.php b/api/tests/AnalyticsTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..be86618673aef3b51e22b917870b577163977ea1
--- /dev/null
+++ b/api/tests/AnalyticsTest.php
@@ -0,0 +1,164 @@
+<?php
+
+namespace App\Tests;
+
+use ApiPlatform\Core\Bridge\Symfony\Bundle\Test\ApiTestCase;
+use App\Entity\Book;
+use Hautelook\AliceBundle\PhpUnit\RefreshDatabaseTrait;
+
+class AnalyticsTest extends ApiTestCase
+{
+    public function testAverageSurfacePriceOk(): void
+    {
+        $response = static::createClient()->request('GET', '/property_sales/average_surface_price');
+
+        // Asserts that the response has 200 Status Code
+        $this->assertResponseIsSuccessful();
+        // Asserts that the returned content type is JSON
+        $this->assertResponseHeaderSame('content-type', 'application/json');
+    }
+
+    public function testSalesByRegionOk(): void
+    {
+        $response = static::createClient()->request('GET', '/property_sales/sales_by_region', [
+            'query' => [
+                'year' => 2016 
+            ],
+        ]);
+
+        // Asserts that the response has 200 Status Code
+        $this->assertResponseIsSuccessful();
+        // Asserts that the returned content type is JSON (the default)
+        $this->assertResponseHeaderSame('content-type', 'application/json');
+    }
+
+    public function testSalesByRegionIncorrect(): void
+    {
+        $response = static::createClient()->request('GET', '/property_sales/sales_by_region', [
+            'query' => [
+                'year' => 201677
+            ],
+        ]);
+
+        // Assertion on the Status Code
+        $this->assertResponseStatusCodeSame(400);
+        // Asserts that the returned content type is Text (errors respond with texts)
+        $this->assertResponseHeaderSame('content-type', 'application/text');
+
+        $text = $response->getContent(false);
+        assert(strcmp($text, 'Bad Request') !== false, "Tests the text returned with the error");
+    }
+
+    public function testSalesByRegionNoParameter(): void
+    {
+        $response = static::createClient()->request('GET', '/property_sales/sales_by_region');
+
+        // Assertion on the Status Code
+        $this->assertResponseStatusCodeSame(400);
+        // Asserts that the returned content type is Text (errors respond with texts)
+        $this->assertResponseHeaderSame('content-type', 'application/text');
+    }
+
+    public function testSalesByGranularityOk(): void
+    {
+        $response = static::createClient()->request('GET', '/property_sales/sales_by_granularity', [
+            'query' => [
+                'granularity' => 'day',
+                'date_start' => '2018-11-24',
+                'date_end' => '2018-12-24' 
+            ],
+        ]);
+
+        // Asserts that the response has 200 Status Code
+        $this->assertResponseIsSuccessful();
+        // Asserts that the returned content type is JSON (the default)
+        $this->assertResponseHeaderSame('content-type', 'application/json');
+    }
+
+    public function testSalesByGranularityGranularityIncorrect(): void
+    {
+        $response = static::createClient()->request('GET', '/property_sales/sales_by_granularity', [
+            'query' => [
+                'granularity' => 'week',
+                'date_start' => '2018-11-24',
+                'date_end' => '2018-12-24' 
+            ],
+        ]);
+
+        // Assertion on the Status Code
+        $this->assertResponseStatusCodeSame(400);
+        // Asserts that the returned content type is Text (errors respond with texts)
+        $this->assertResponseHeaderSame('content-type', 'application/text');
+
+        $text = $response->getContent(false);
+        assert(strpos($text, 'wrong format') !== false, "Tests that the error is a wrong format");
+    }
+
+    public function testSalesByGranularityDateStartIncorrect(): void
+    {
+        $response = static::createClient()->request('GET', '/property_sales/sales_by_granularity', [
+            'query' => [
+                'granularity' => 'day',
+                'date_start' => 'arriva',
+                'date_end' => '2018-12-24' 
+            ],
+        ]);
+
+        // Assertion on the Status Code
+        $this->assertResponseStatusCodeSame(400);
+        // Asserts that the returned content type is Text (errors respond with texts)
+        $this->assertResponseHeaderSame('content-type', 'application/text');
+
+        $text = $response->getContent(false);
+        assert(strpos($text, 'wrong format') !== false, "Tests that the error is a wrong format");
+    }
+
+    public function testSalesByGranularityDateEndIncorrect(): void
+    {
+        $response = static::createClient()->request('GET', '/property_sales/sales_by_granularity', [
+            'query' => [
+                'granularity' => 'day',
+                'date_start' => '2018-11-24',
+                'date_end' => 'speedy gonzales' 
+            ],
+        ]);
+
+        // Assertion on the Status Code
+        $this->assertResponseStatusCodeSame(400);
+        // Asserts that the returned content type is Text (errors respond with texts)
+        $this->assertResponseHeaderSame('content-type', 'application/text');
+
+        $text = $response->getContent(false);
+        assert(strpos($text, 'wrong format') !== false, "Tests that the error is a wrong format");
+    }
+
+    public function testSalesByGranularityDateEndBeforeDateStart(): void
+    {
+        $response = static::createClient()->request('GET', '/property_sales/sales_by_granularity', [
+            'query' => [
+                'granularity' => 'day',
+                'date_start' => '2018-11-24',
+                'date_end' => '2017-11-24' 
+            ],
+        ]);
+
+        // Assertion on the Status Code
+        $this->assertResponseStatusCodeSame(400);
+        // Asserts that the returned content type is Text (errors respond with texts)
+        $this->assertResponseHeaderSame('content-type', 'application/text');
+
+        $text = $response->getContent(false);
+        assert(strpos($text, 'before') !== false, "Tests that the error is a end before start");
+    }
+
+    public function testSalesByGranularityNoParameter(): void
+    {
+        $response = static::createClient()->request('GET', '/property_sales/sales_by_granularity');
+
+        // Assertion on the Status Code
+        $this->assertResponseStatusCodeSame(400);
+        // Asserts that the returned content type is Text (errors respond with texts)
+        $this->assertResponseHeaderSame('content-type', 'application/text');
+    }
+}
+?>
\ No newline at end of file