Step 1: Initial commit

.gitignore

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+/vendor/
+/*.cache

composer.json

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+{
+	"name": "opdavies/ddev-phpunit-command-example",
+	"description": "An example of adding a custom PHPUnit command to a DDEV project.",
+	"license": "MIT",
+    "autoload-dev": {
+    	"psr-4": {
+            "App\\Tests\\": "tests/"
+    	}
+    },
+	"require-dev": {
+		"phpunit/phpunit": "^9.3"
+	}
+}

phpunit.xml.dist

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="./vendor/phpunit/phpunit/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+>
+    <testsuites>
+        <testsuite name="Unit">
+            <directory suffix="Test.php">./tests</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>

tests/ExampleTest.php

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+<?php
+
+namespace App\Tests;
+
+use PHPUnit\Framework\TestCase;
+
+class ExampleTest extends TestCase
+{
+    /** @test */
+    public function it_passes()
+    {
+        $this->assertTrue(true);
+    }
+}

web/index.php

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+<?php
+
+echo 'Hello World!';