first tests to introduce

phpunit.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.5/phpunit.xsd"
+         bootstrap="tests/bootstrap.php"
+         cacheResultFile=".phpunit.cache/test-results"
+         executionOrder="depends,defects"
+         forceCoversAnnotation="true"
+         beStrictAboutCoversAnnotation="true"
+         beStrictAboutOutputDuringTests="true"
+         beStrictAboutTodoAnnotatedTests="true"
+         failOnRisky="true"
+         failOnWarning="true"
+         verbose="true">
+    <testsuites>
+        <testsuite name="default">
+            <directory suffix="Test.php">tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <coverage cacheDirectory=".phpunit.cache/code-coverage"
+              processUncoveredFiles="true">
+        <include>
+            <directory suffix=".php">src</directory>
+        </include>
+    </coverage>
+</phpunit>

tests/DirectoryTest.php

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+<?php
+
+namespace Templado\Cli;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Class RequestTest
+ * @package Templado\Cli
+ *
+ * @covers \Templado\Cli\Directory
+ */
+class DirectoryTest extends TestCase
+{
+    public function testCanBeCreated()
+    {
+        $this->assertInstanceOf(
+            Directory::class,
+            new Directory(__DIR__ . '/_data')
+        );
+    }
+
+    public function testCanBeRetrieved()
+    {
+        $directory = new Directory(__DIR__ . '/_data');
+        $this->assertEquals(__DIR__ . '/_data', $directory->asString());
+    }
+
+    public function testCantBeCreatedOnEmptyArgument()
+    {
+        $this->expectException(DirectoryException::class);
+        new Directory('');
+    }
+
+    public function testCantBeCreatedOnNonExistingDirectory()
+    {
+        $this->expectException(DirectoryException::class);
+        new Directory(__DIR__ . '/DirectoryTest.php');
+    }
+
+    public function testCanGetIterator()
+    {
+        $directory = new Directory(__DIR__ . '/_data');
+        $this->assertInstanceOf(\Traversable::class, $directory->getIterator());
+    }
+
+    public function testCanClear()
+    {
+        $tempDir = __DIR__ . '/_fixture/deleteableFiles';
+
+        //just to be sure we have a valid fixtuer setup
+        if (!file_exists($tempDir . '/somefile.txt'))
+            touch($tempDir . '/somefile.txt');
+        $this->assertEquals(1, count(scandir($tempDir)) - 2);
+
+        $directory = new Directory($tempDir);
+        $directory->clear();
+
+        $this->assertEquals(0, count(scandir($tempDir)) - 2);
+    }
+}

tests/bootstrap.php

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+<?php declare(strict_types=1);
+
+require __DIR__ . '/../src/autoload.php';
+require __DIR__ . '/../vendor/autoload.php';