Removed phpsec as the testing library, added phpunit and converted the first spec test to phpunit format. Also added mockery.

tests/Flarum/Core/Settings/MemoryCacheSettingsRepositoryTest.php

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+<?php
+namespace tests\Flarum\Core\Settings;
+
+use Flarum\Core\Settings\MemoryCacheSettingsRepository;
+use Flarum\Core\Settings\SettingsRepository;
+use Mockery as m;
+use tests\Test\TestCase;
+
+class MemoryCacheSettingsRepositoryTest extends TestCase
+{
+    private $baseRepository;
+    private $repository;
+
+    public function init()
+    {
+        $this->baseRepository = m::mock(SettingsRepository::class);
+        $this->repository = new MemoryCacheSettingsRepository($this->baseRepository);
+    }
+    
+    public function test_it_should_return_all_settings_when_not_cached()
+    {
+        $this->baseRepository->shouldReceive('all')->once()->andReturn(['key' => 'value']);
+
+        $this->assertEquals(['key' => 'value'], $this->repository->all());
+        $this->assertEquals(['key' => 'value'], $this->repository->all()); // Assert twice to ensure we hit the cache
+    }
+
+    public function test_it_should_retrieve_a_specific_value()
+    {
+        $this->baseRepository->shouldReceive('all')->once()->andReturn(['key1' => 'value1', 'key2' => 'value2']);
+
+        $this->assertEquals('value2', $this->repository->get('key2'));
+        $this->assertEquals('value2', $this->repository->get('key2')); // Assert twice to ensure we hit the cache
+    }
+    
+    public function test_it_should_set_a_key_value_pair()
+    {
+        $this->baseRepository->shouldReceive('set')->once();
+
+        $this->repository->set('key', 'value');
+
+        $this->assertEquals('value', $this->repository->get('key'));
+    }
+}

tests/Test/TestCase.php

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+<?php
+namespace tests\Test;
+
+use Mockery;
+use PHPUnit_Framework_TestCase;
+
+class TestCase extends PHPUnit_Framework_TestCase
+{
+    public function setUp()
+    {
+        Mockery::close();
+
+        $this->init();
+    }
+
+    protected function init()
+    {
+        // To be overloaded by children - saves having to do setUp/mockery::close every time
+    }
+}

tests/phpunit.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false"
+         syntaxCheck="false">
+
+    <testsuites>
+        <testsuite name="all">
+            <directory suffix="Test.php">./</directory>
+        </testsuite>
+    </testsuites>
+
+    <php>
+        <env name="APP_ENV" value="testing"/>
+        <env name="CACHE_DRIVER" value="array"/>
+    </php>
+
+</phpunit>