create email and emailer with tests

tests/Unit/Email/EmailTest.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Tests\Unit\Email;
+
+use PHPUnit\Framework\TestCase;
+use FreightQuote\Email\Email;
+
+class EmailTest extends TestCase
+{
+    private Email $email;
+
+    public function setUp(): void
+    {
+        $this->email = new Email();
+    }
+
+    public function test_email_recipients(): void
+    {
+        $emailAddress = 'test@email.com';
+        $this->email->addRecipient($emailAddress);
+        $this->assertEquals([$emailAddress], $this->email->getRecipients());
+    }
+
+    public function test_email_cc(): void
+    {
+        $emailAddress = 'test@email.com';
+        $this->email->addCC($emailAddress);
+        $this->assertEquals([$emailAddress], $this->email->getCC());
+    }
+
+    public function test_email_bcc(): void
+    {
+        $emailAddress = 'test@email.com';
+        $this->email->addBCC($emailAddress);
+        $this->assertEquals([$emailAddress], $this->email->getBCC());
+    }
+
+    public function test_email_subject(): void
+    {
+        $subject = 'test subject';
+        $this->email->setSubject($subject);
+        $this->assertEquals($subject, $this->email->getSubject());
+    }
+
+    public function test_email_body(): void
+    {
+        $body = 'test body';
+        $this->email->setBody($body);
+        $this->assertEquals($body, $this->email->getBody());
+    }
+
+    public function test_email_attachments(): void
+    {
+        $path = '/path/to/file';
+        $this->email->addAttachment($path);
+        $this->assertEquals([$path], $this->email->getAttachments());
+    }
+}