add unit tests

Author: xaviermarchegay

tests/Exception/MissingTransformerExceptionTest.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Exception;
+
+use CleverAge\ProcessBundle\Exception\MissingTransformerException;
+use PHPUnit\Framework\TestCase;
+use UnexpectedValueException;
+
+class MissingTransformerExceptionTest extends TestCase
+{
+    /**
+     * @covers \CleverAge\ProcessBundle\Exception\MissingTransformerException::create
+     */
+    public function testCreate(): void
+    {
+        $exception = MissingTransformerException::create('my_transformer');
+
+        $this->assertInstanceOf(UnexpectedValueException::class, $exception);
+        $this->assertEquals('No transformer with code : my_transformer', $exception->getMessage());
+    }
+}