Merge pull request #2 from DanielSiepmann/feature/improve-api

Improve API

.github/workflows/ci.yaml

@@ -14,6 +14,8 @@ jobs:
     strategy:
       matrix:
         php-version:
+          - 7.2
+          - 7.3
           - 7.4
     steps:
       - name: Checkout
@@ -27,6 +29,29 @@ jobs:
       - name: PHP lint
         run: "find *.php src tests -name '*.php' -print0 | xargs -0 -n 1 -P 4 php -l"
 
+  check-cgl:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Get Composer Cache Directory
+        id: composer-cache
+        run: |
+            echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - uses: actions/cache@v1
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-composer-
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress --no-suggest
+
+      - name: Check CGL
+        run: ./vendor/bin/phpcs
+
   tests:
     runs-on: ubuntu-latest
     steps:

composer.json

@@ -10,9 +10,9 @@
         }
     ],
     "require": {
-        "guzzlehttp/guzzle": "^6.5",
         "ext-json": "*",
-		"php": "^7.4"
+        "guzzlehttp/guzzle": "^6.5",
+        "php": "7.2.* || 7.3.* || 7.4.*"
     },
     "autoload": {
         "files": [ "src/Constants/VerificationTypes.php" ],
@@ -27,6 +27,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^9.3",
-        "phpspec/prophecy-phpunit": "^2.0"
+        "phpspec/prophecy-phpunit": "^2.0",
+        "squizlabs/php_codesniffer": "^3.5"
     }
 }

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": "5ddae281cdc978a7b2312629a0fec326",
+    "content-hash": "20a8d4087070dc229b18c15160e7bf79",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
@@ -2481,6 +2481,57 @@
             ],
             "time": "2020-06-26T12:18:43+00:00"
         },
+        {
+            "name": "squizlabs/php_codesniffer",
+            "version": "3.5.6",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/squizlabs/PHP_CodeSniffer.git",
+                "reference": "e97627871a7eab2f70e59166072a6b767d5834e0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/e97627871a7eab2f70e59166072a6b767d5834e0",
+                "reference": "e97627871a7eab2f70e59166072a6b767d5834e0",
+                "shasum": ""
+            },
+            "require": {
+                "ext-simplexml": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": ">=5.4.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.0 || ^5.0 || ^6.0 || ^7.0"
+            },
+            "bin": [
+                "bin/phpcs",
+                "bin/phpcbf"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.x-dev"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Greg Sherwood",
+                    "role": "lead"
+                }
+            ],
+            "description": "PHP_CodeSniffer tokenizes PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.",
+            "homepage": "https://github.com/squizlabs/PHP_CodeSniffer",
+            "keywords": [
+                "phpcs",
+                "standards"
+            ],
+            "time": "2020-08-10T04:50:15+00:00"
+        },
         {
             "name": "symfony/polyfill-ctype",
             "version": "v1.18.1",
@@ -2660,7 +2711,7 @@
     "prefer-lowest": false,
     "platform": {
         "ext-json": "*",
-        "php": "^7.4"
+        "php": "7.2.* || 7.3.* || 7.4.*"
     },
     "platform-dev": [],
     "plugin-api-version": "1.1.0"

phpcs.xml.dist

@@ -0,0 +1,14 @@
+<?xml version="1.0"?>
+<ruleset name="project">
+    <description>This project coding standard</description>
+
+    <file>src/</file>
+    <file>tests/</file>
+
+    <arg name="encoding" value="utf-8" />
+    <arg name="extensions" value="php" />
+
+    <rule ref="PSR12">
+        <exclude name="Generic.Files.LineLength.TooLong" />
+    </rule>
+</ruleset>

src/Api/Skill.php

@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SkillDisplay\PHPToolKit\Api;
+
+/*
+ * Copyright (C) 2020 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use GuzzleHttp\Client;
+use GuzzleHttp\Exception\ClientException;
+use GuzzleHttp\Psr7\Request;
+use SkillDisplay\PHPToolKit\Configuration\Settings;
+use SkillDisplay\PHPToolKit\Entity\Skill as Entity;
+
+class Skill
+{
+    /**
+     * @var Settings
+     */
+    protected $settings;
+
+    /**
+     * @var Client
+     */
+    protected $client;
+
+    public function __construct(
+        Settings $settings,
+        Client $client
+    ) {
+        $this->settings = $settings;
+        $this->client = $client;
+    }
+
+    public function getById(int $id): Entity
+    {
+        if ($id <= 0) {
+            throw new \Exception('ID of Skill has to be a positive integer.', 1600764849);
+        }
+
+        $url = $this->settings->getAPIUrl() . '/api/v1/skill/' . $id;
+        try {
+            $result = $this->client->send(new Request(
+                'GET',
+                $url,
+                [
+                    'Content-Type' => 'application/json',
+                    'x-api-key' => $this->settings->getApiKey()
+                ]
+            ));
+        } catch (ClientException $e) {
+            if ($e->getCode() === 404) {
+                throw new \InvalidArgumentException('Given Skill with id "' . $id . '" not available.', 1601881616);
+            }
+            throw $e;
+        }
+
+        if ($result->getStatusCode() !== 200) {
+            throw new \Exception('Did not get proper response for skill.', 1600694312);
+        }
+
+        return Entity::createFromJson((string) $result->getBody());
+    }
+}

src/Api/SkillSet.php

@@ -0,0 +1,86 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SkillDisplay\PHPToolKit\Api;
+
+/*
+ * Copyright (C) 2020 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use GuzzleHttp\Client;
+use GuzzleHttp\Psr7\Request;
+use SkillDisplay\PHPToolKit\Configuration\Settings;
+use SkillDisplay\PHPToolKit\Entity\SkillSet as Entity;
+
+class SkillSet
+{
+    /**
+     * @var Settings
+     */
+    protected $settings;
+
+    /**
+     * @var Client
+     */
+    protected $client;
+
+    public function __construct(
+        Settings $settings,
+        Client $client
+    ) {
+        $this->settings = $settings;
+        $this->client = $client;
+    }
+
+    public function getById(int $id): Entity
+    {
+        if ($id <= 0) {
+            throw new \Exception('ID of SkillSet has to be a positive integer.', 1600764811);
+        }
+
+        $url = $this->settings->getAPIUrl() . '/api/v1/skillset/' . $id;
+        try {
+            $result = $this->client->send(new Request(
+                'GET',
+                $url,
+                [
+                    'Content-Type' => 'application/json',
+                    'x-api-key' => $this->settings->getApiKey()
+                ]
+            ));
+        } catch (ClientException $e) {
+            if ($e->getCode() === 404) {
+                throw new \InvalidArgumentException('Given SkillSet with id "' . $id . '" not available.', 1601881616);
+            }
+            throw $e;
+        }
+
+        if ($result->getStatusCode() !== 200) {
+            throw new \Exception('Did not get proper response for SkillSet.', 1600694312);
+        }
+
+        $body = (string) $result->getBody();
+
+        if (strpos($body, 'Oops, an error occurred') !== false) {
+            throw new \Exception('Did not get proper response for SkillSet. SkillSet with id "' . $id . '" does probably not exist.', 1600694312);
+        }
+
+        return Entity::createFromJson($body);
+    }
+}

src/Configuration/Settings.php

@@ -1,15 +1,35 @@
 <?php
+
 declare(strict_types=1);
 
 namespace SkillDisplay\PHPToolKit\Configuration;
 
 class Settings
 {
-    private string $user_secret;
-    private string $apiKey;
-    private int $verifierID;
-    private string $APIUrl;
-    private string $mySkillDisplayUrl;
+    /**
+     * @var string
+     */
+    private $user_secret = '';
+
+    /**
+     * @var string
+     */
+    private $apiKey = '';
+
+    /**
+     * @var int
+     */
+    private $verifierID = 0;
+
+    /**
+     * @var string
+     */
+    private $APIUrl = '';
+
+    /**
+     * @var string
+     */
+    private $mySkillDisplayUrl = '';
 
     public function getVerifierID(): int
     {
@@ -49,7 +69,7 @@ class Settings
         $this->apiKey = $apiKey;
         $this->verifierID = $verifierID;
         $this->user_secret = $user_secret;
-        $this->APIUrl = is_null($domain) ? 'https://www.skilldisplay.eu' : 'https://' . $domain;
-        $this->mySkillDisplayUrl = is_null($domain) ? 'https://my.skilldisplay.eu' : 'https://my.' . $domain;
+        $this->APIUrl = (is_null($domain)) ? 'https://www.skilldisplay.eu' : 'https://' . $domain;
+        $this->mySkillDisplayUrl = (is_null($domain)) ? 'https://my.skilldisplay.eu' : 'https://my.' . $domain;
     }
 }

src/Constants/VerificationTypes.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 define('VERIFICATION_SELF', 'self');
 define('VERIFICATION_EDUCATIONAL', 'education');
 define('VERIFICATION_BUSINESS', 'business');

src/Entity/Skill.php

@@ -0,0 +1,67 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SkillDisplay\PHPToolKit\Entity;
+
+/*
+ * Copyright (C) 2020 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+class Skill
+{
+    /**
+     * @var array
+     */
+    private $data;
+
+    private function __construct(array $data)
+    {
+        $this->data = $data;
+    }
+
+    public function getId(): int
+    {
+        return $this->data['uid'];
+    }
+
+    public function getTitle(): string
+    {
+        return $this->data['title'] ?? '';
+    }
+
+    public function getDescription(): string
+    {
+        return $this->data['description'] ?? '';
+    }
+
+    public function getGoals(): string
+    {
+        return $this->data['goals'] ?? '';
+    }
+
+    public function toArray(): array
+    {
+        return $this->data;
+    }
+
+    public static function createFromJson(string $json): Skill
+    {
+        return new Skill(json_decode($json, true));
+    }
+}

src/Entity/SkillSet.php

@@ -0,0 +1,80 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SkillDisplay\PHPToolKit\Entity;
+
+/*
+ * Copyright (C) 2020 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+class SkillSet
+{
+    /**
+     * @var array
+     */
+    private $data;
+
+    private function __construct(array $data)
+    {
+        $this->data = $data;
+    }
+
+    public function getId(): int
+    {
+        return $this->data['uid'];
+    }
+
+    public function getName(): string
+    {
+        return $this->data['name'] ?? '';
+    }
+
+    public function getDescription(): string
+    {
+        return $this->data['description'] ?? '';
+    }
+
+    /**
+     * @return Skill[]
+     */
+    public function getSkills(): array
+    {
+        static $skills = [];
+
+        if ($skills !== []) {
+            return $skills;
+        }
+
+        foreach ($this->data['skills'] as $skill) {
+            $skills[] = Skill::createFromJson(json_encode($skill));
+        }
+
+        return $skills;
+    }
+
+    public function toArray(): array
+    {
+        return $this->data;
+    }
+
+    public static function createFromJson(string $json): SkillSet
+    {
+        return new SkillSet(json_decode($json, true));
+    }
+}

src/Example/APIKeyRequired/AutoGrantSelfVerification.php

@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace SkillDisplay\PHPToolKit\Example\APIKeyRequired;

src/Example/FullSettingsRequired/AutoGrantBusinessVerification.php

@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace SkillDisplay\PHPToolKit\Example\APIKeyRequired;

src/Example/Includes/ExampleSettings.php

@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 use SkillDisplay\PHPToolKit\Configuration\Settings;

src/Example/NoSettingsRequired/RenderCustomVerificationLinks.php

@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace SkillDisplay\PHPToolKit\Example\NoSettingsRequired;

src/Example/NoSettingsRequired/RenderVerificationButtons.php

@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace SkillDisplay\PHPToolKit\Example\NoSettingsRequired;

src/Verification/Issuer.php

@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace SkillDisplay\PHPToolKit\Verification;
@@ -9,8 +10,15 @@ use SkillDisplay\PHPToolKit\Configuration\Settings;
 
 class Issuer
 {
-    private Settings $settings;
-    private string $apislug = '/api/v1/verification/create';
+    /**
+     * @var Settings
+     */
+    private $settings;
+
+    /**
+     * @var string
+     */
+    private $apislug = '/api/v1/verification/create';
 
     /**
      * @param int $ID ID of the Skill or SkillSet
@@ -24,8 +32,7 @@ class Issuer
         string $useremail,
         string $vtype,
         bool $isSkillSet = false
-    ): array
-    {
+    ): array {
         if ($isSkillSet) {
             $requestData['SkillSetId'] = $ID;
         } else {
@@ -72,8 +79,7 @@ class Issuer
         string $useremail,
         string $vtype,
         bool $isSkillSet = false
-    ): ResponseInterface
-    {
+    ): ResponseInterface {
         $requestData = $this->generateSignedRequestData($skillID, $useremail, $vtype, $isSkillSet);
 
         $client = new \GuzzleHttp\Client();

tests/Unit/Api/SkillSetTest.php

@@ -0,0 +1,148 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SkillDisplay\PHPToolKit\Tests\Unit\Api;
+
+/*
+ * Copyright (C) 2020 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use GuzzleHttp\Client;
+use GuzzleHttp\Psr7\Request;
+use GuzzleHttp\Psr7\Response;
+use Prophecy\Argument;
+use Prophecy\PhpUnit\ProphecyTrait;
+use SkillDisplay\PHPToolKit\Api\SkillSet;
+use PHPUnit\Framework\TestCase;
+use SkillDisplay\PHPToolKit\Configuration\Settings;
+use SkillDisplay\PHPToolKit\Entity\SkillSet as Entity;
+
+/**
+ * @covers SkillDisplay\PHPToolKit\Api\SkillSet
+ */
+class SkillSetTest extends TestCase
+{
+    use ProphecyTrait;
+
+    /**
+     * @test
+     */
+    public function instanceCanBeCreated()
+    {
+        $settings = $this->prophesize(Settings::class);
+        $client = $this->prophesize(Client::class);
+
+        $subject = new SkillSet(
+            $settings->reveal(),
+            $client->reveal()
+        );
+
+        static::assertInstanceOf(SkillSet::class, $subject);
+    }
+
+    /**
+     * @test
+     */
+    public function fetchedEntityFromApi()
+    {
+        $settings = $this->prophesize(Settings::class);
+        $client = $this->prophesize(Client::class);
+        $response = $this->prophesize(Response::class);
+
+        $settings->getAPIUrl()->willReturn('https://example.com');
+        $settings->getApiKey()->willReturn('none');
+
+        $client->send(Argument::that(function (Request $request) {
+            return (string) $request->getUri() === 'https://example.com/api/v1/skillset/10'
+                && $request->getHeader('x-api-key') === ['none']
+                && $request->getHeader('Content-Type') === ['application/json']
+                && $request->getMethod() === 'GET'
+                ;
+        }))->willReturn($response->reveal());
+
+        $response->getStatusCode()->willReturn(200);
+        $response->getBody()->willReturn('{"uid":10}');
+
+        $subject = new SkillSet(
+            $settings->reveal(),
+            $client->reveal()
+        );
+        $result = $subject->getById(10);
+        static::assertInstanceOf(Entity::class, $result);
+    }
+
+    /**
+     * @test
+     */
+    public function throwsExceptionIfStatusCodeIsNot200()
+    {
+        $settings = $this->prophesize(Settings::class);
+        $client = $this->prophesize(Client::class);
+        $response = $this->prophesize(Response::class);
+
+        $settings->getAPIUrl()->willReturn('https://example.com');
+        $settings->getApiKey()->willReturn('none');
+
+        $client->send(Argument::any())->willReturn($response->reveal());
+
+        $response->getStatusCode()->willReturn(500);
+
+        $subject = new SkillSet(
+            $settings->reveal(),
+            $client->reveal()
+        );
+
+        $this->expectExceptionMessage('Did not get proper response for SkillSet.');
+        $this->expectExceptionCode(1600694312);
+
+        $result = $subject->getById(10);
+    }
+
+    /**
+     * @test
+     * @dataProvider nonePositiveIds
+     */
+    public function throwsExceptionIfSkillSetIdIsNotPositive(int $skillId)
+    {
+        $settings = $this->prophesize(Settings::class);
+        $client = $this->prophesize(Client::class);
+
+        $subject = new SkillSet(
+            $settings->reveal(),
+            $client->reveal()
+        );
+
+        $this->expectExceptionMessage('ID of SkillSet has to be a positive integer.');
+        $this->expectExceptionCode(1600764811);
+
+        $subject->getById($skillId);
+    }
+
+    public function nonePositiveIds(): array
+    {
+        return [
+            'zero' => [
+                'skillId' => 0,
+            ],
+            'negative' => [
+                'skillId' => -1,
+            ],
+        ];
+    }
+}

tests/Unit/Api/SkillTest.php

@@ -0,0 +1,148 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SkillDisplay\PHPToolKit\Tests\Unit\Api;
+
+/*
+ * Copyright (C) 2020 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use GuzzleHttp\Client;
+use GuzzleHttp\Psr7\Request;
+use GuzzleHttp\Psr7\Response;
+use Prophecy\Argument;
+use Prophecy\PhpUnit\ProphecyTrait;
+use SkillDisplay\PHPToolKit\Api\Skill;
+use PHPUnit\Framework\TestCase;
+use SkillDisplay\PHPToolKit\Configuration\Settings;
+use SkillDisplay\PHPToolKit\Entity\Skill as Entity;
+
+/**
+ * @covers SkillDisplay\PHPToolKit\Api\Skill
+ */
+class SkillTest extends TestCase
+{
+    use ProphecyTrait;
+
+    /**
+     * @test
+     */
+    public function instanceCanBeCreated()
+    {
+        $settings = $this->prophesize(Settings::class);
+        $client = $this->prophesize(Client::class);
+
+        $subject = new Skill(
+            $settings->reveal(),
+            $client->reveal()
+        );
+
+        static::assertInstanceOf(Skill::class, $subject);
+    }
+
+    /**
+     * @test
+     */
+    public function fetchedEntityFromApi()
+    {
+        $settings = $this->prophesize(Settings::class);
+        $client = $this->prophesize(Client::class);
+        $response = $this->prophesize(Response::class);
+
+        $settings->getAPIUrl()->willReturn('https://example.com');
+        $settings->getApiKey()->willReturn('none');
+
+        $client->send(Argument::that(function (Request $request) {
+            return (string) $request->getUri() === 'https://example.com/api/v1/skill/10'
+                && $request->getHeader('x-api-key') === ['none']
+                && $request->getHeader('Content-Type') === ['application/json']
+                && $request->getMethod() === 'GET'
+                ;
+        }))->willReturn($response->reveal());
+
+        $response->getStatusCode()->willReturn(200);
+        $response->getBody()->willReturn('{"uid":10}');
+
+        $subject = new Skill(
+            $settings->reveal(),
+            $client->reveal()
+        );
+        $result = $subject->getById(10);
+        static::assertInstanceOf(Entity::class, $result);
+    }
+
+    /**
+     * @test
+     */
+    public function throwsExceptionIfStatusCodeIsNot200()
+    {
+        $settings = $this->prophesize(Settings::class);
+        $client = $this->prophesize(Client::class);
+        $response = $this->prophesize(Response::class);
+
+        $settings->getAPIUrl()->willReturn('https://example.com');
+        $settings->getApiKey()->willReturn('none');
+
+        $client->send(Argument::any())->willReturn($response->reveal());
+
+        $response->getStatusCode()->willReturn(500);
+
+        $subject = new Skill(
+            $settings->reveal(),
+            $client->reveal()
+        );
+
+        $this->expectExceptionMessage('Did not get proper response for skill.');
+        $this->expectExceptionCode(1600694312);
+
+        $result = $subject->getById(10);
+    }
+
+    /**
+     * @test
+     * @dataProvider nonePositiveIds
+     */
+    public function throwsExceptionIfSkillIdIsNotPositive(int $skillId)
+    {
+        $settings = $this->prophesize(Settings::class);
+        $client = $this->prophesize(Client::class);
+
+        $subject = new Skill(
+            $settings->reveal(),
+            $client->reveal()
+        );
+
+        $this->expectExceptionMessage('ID of Skill has to be a positive integer.');
+        $this->expectExceptionCode(1600764849);
+
+        $subject->getById($skillId);
+    }
+
+    public function nonePositiveIds(): array
+    {
+        return [
+            'zero' => [
+                'skillId' => 0,
+            ],
+            'negative' => [
+                'skillId' => -1,
+            ],
+        ];
+    }
+}

tests/Unit/Configuration/SettingsTest.php

@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace SkillDisplay\PHPToolKit\Tests\Unit\Configuration;

tests/Unit/Entity/SkillSetTest.php

@@ -0,0 +1,115 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SkillDisplay\PHPToolKit\Tests\Unit\Entity;
+
+/*
+ * Copyright (C) 2020 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use PHPUnit\Framework\TestCase;
+use SkillDisplay\PHPToolKit\Entity\SkillSet;
+
+/**
+ * @covers SkillDisplay\PHPToolKit\Entity\SkillSet
+ */
+class SkillSetTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function instanceCanNotBeCreatedViaConstructor()
+    {
+        $this->expectErrorMessage('Call to private SkillDisplay\PHPToolKit\Entity\SkillSet::__construct() from context \'SkillDisplay\PHPToolKit\Tests\Unit\Entity\SkillSetTest\'');
+        new SkillSet();
+    }
+
+    /**
+     * @test
+     */
+    public function instanceCanBeCreatedFromJson()
+    {
+        $subject = SkillSet::createFromJson('{}');
+        static::assertInstanceOf(SkillSet::class, $subject);
+    }
+
+    /**
+     * @test
+     */
+    public function instanceReturnsId()
+    {
+        $subject = SkillSet::createFromJson('{"uid":90}');
+        static::assertSame(90, $subject->getId());
+    }
+
+    /**
+     * @test
+     */
+    public function instanceReturnsName()
+    {
+        $subject = SkillSet::createFromJson('{"name":"Example name"}');
+        static::assertSame('Example name', $subject->getName());
+    }
+
+    /**
+     * @test
+     */
+    public function instanceReturnsDescription()
+    {
+        $subject = SkillSet::createFromJson('{"description":"<p>Example description</p>"}');
+        static::assertSame('<p>Example description</p>', $subject->getDescription());
+    }
+
+    /**
+     * @test
+     */
+    public function instanceReturnsSkills()
+    {
+        $subject = SkillSet::createFromJson('{"skills":[{"uid":90,"title":"Example title 1"},{"goals":"<p>Example goals</p>","uid":91,"title":"Example title 2"}]}');
+        $skills = $subject->getSkills();
+
+        static::assertCount(2, $skills);
+        static::assertSame(90, $skills[0]->getId());
+        static::assertSame(91, $skills[1]->getId());
+    }
+
+    /**
+     * @test
+     */
+    public function instanceReturnsSameSkillInstancesA2ndTime()
+    {
+        $subject = SkillSet::createFromJson('{"skills":[{"uid":90,"title":"Example title 1"},{"goals":"<p>Example goals</p>","uid":91,"title":"Example title 2"}]}');
+        $skillsFirstCall = $subject->getSkills();
+        $skillsSecondCall = $subject->getSkills();
+
+        static::assertSame($skillsFirstCall, $skillsSecondCall);
+    }
+
+    /**
+     * @test
+     */
+    public function canBeConvertedToArray()
+    {
+        $subject = SkillSet::createFromJson('{"uid":90,"name":"Example name"}');
+        static::assertSame([
+            'uid' => 90,
+            'name' => 'Example name',
+        ], $subject->toArray());
+    }
+}

tests/Unit/Entity/SkillTest.php

@@ -0,0 +1,100 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SkillDisplay\PHPToolKit\Tests\Unit\Entity;
+
+/*
+ * Copyright (C) 2020 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use PHPUnit\Framework\TestCase;
+use SkillDisplay\PHPToolKit\Entity\Skill;
+
+/**
+ * @covers SkillDisplay\PHPToolKit\Entity\Skill
+ */
+class SkillTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function instanceCanNotBeCreatedViaConstructor()
+    {
+        $this->expectErrorMessage('Call to private SkillDisplay\PHPToolKit\Entity\Skill::__construct() from context \'SkillDisplay\PHPToolKit\Tests\Unit\Entity\SkillTest\'');
+        new Skill();
+    }
+
+    /**
+     * @test
+     */
+    public function instanceCanBeCreatedFromJson()
+    {
+        $subject = Skill::createFromJson('{}');
+        static::assertInstanceOf(Skill::class, $subject);
+    }
+
+    /**
+     * @test
+     */
+    public function instanceReturnsId()
+    {
+        $subject = Skill::createFromJson('{"uid":90}');
+        static::assertSame(90, $subject->getId());
+    }
+
+    /**
+     * @test
+     */
+    public function instanceReturnsTitle()
+    {
+        $subject = Skill::createFromJson('{"title":"Example title"}');
+        static::assertSame('Example title', $subject->getTitle());
+    }
+
+    /**
+     * @test
+     */
+    public function instanceReturnsDescription()
+    {
+        $subject = Skill::createFromJson('{"description":"<p>Example description</p>"}');
+        static::assertSame('<p>Example description</p>', $subject->getDescription());
+    }
+
+    /**
+     * @test
+     */
+    public function instanceReturnsGoals()
+    {
+        $subject = Skill::createFromJson('{"goals":"<p>Example goals</p>"}');
+        static::assertSame('<p>Example goals</p>', $subject->getGoals());
+    }
+
+    /**
+     * @test
+     */
+    public function canBeConvertedToArray()
+    {
+        $subject = Skill::createFromJson('{"goals":"<p>Example goals</p>","uid":90,"title":"Example title"}');
+        static::assertSame([
+            'goals' => '<p>Example goals</p>',
+            'uid' => 90,
+            'title' => 'Example title',
+        ], $subject->toArray());
+    }
+}