Removed PHPunit learning files

src/Email.php

@@ -1,33 +0,0 @@
-<?php declare(strict_types=1);
-
-namespace MMK2410\MyTodoList;
-
-final class Email
-{
-    private $email;
-
-    private function __construct(string $email)
-    {
-        $this->ensureIsValidEmail($email);
-        $this->email = $email;
-    }
-
-    public static function fromString(string $email): self
-    {
-        return new self($email);
-    }
-
-    public function __toString(): string
-    {
-        return $this->email;
-    }
-
-    private function ensureIsValidEmail(string $email): void
-    {
-        if(!filter_var($email, FILTER_VALIDATE_EMAIL)) {
-            throw new \InvalidArgumentException(
-                sprintf("%s is not a valid email address", $email)
-            );
-        }
-    }
-}

tests/EmailTest.php

@@ -1,27 +0,0 @@
-<?php declare(strict_types=1);
-use PHPUnit\Framework\TestCase;
-use MMK2410\MyTodoList\Email;
-
-final class EmailTest extends TestCase
-{
-    private $email = 'user@example.com';
-
-    public function testCanBeCreatedFromValidEmailAddress(): void {
-        $this->assertInstanceOf(
-            Email::class,
-            Email::fromString($this->email)
-        );
-    }
-
-    public function testCannotBeCreatedFromInvalidEmailAddress(): void {
-        $this->expectException(InvalidArgumentException::class);
-        Email::fromString('invalid');
-    }
-
-    public function testCanBeUsedAsString(): void {
-        $this->assertEquals(
-            $this->email,
-            Email::fromString($this->email)
-        );
-    }
-}