feature: Implement unit test for custom exception.

src/Exception/CircuitException.php

@@ -36,4 +36,12 @@ public function __construct(
         parent::__construct($message, $code, $previous);
         $this->serviceName = $serviceName;
     }
+
+    /**
+     * @return string
+     */
+    public function getServiceName(): string
+    {
+        return $this->serviceName;
+    }
 }

tests/Unit/Exception/CircuitExceptionTest.php

@@ -0,0 +1,27 @@
+<?php
+
+
+namespace Tests\Unit\Exception;
+
+use GabrielAnhaia\PhpCircuitBreaker\Exception\CircuitException;
+use Tests\TestCase;
+
+/**
+ * Class CircuitExceptionTest
+ *
+ * @package Tests\Unit\Exception
+ *
+ * @author Gabriel Anhaia <[email protected]>
+ */
+class CircuitExceptionTest extends TestCase
+{
+    /**
+     * Test if the exception holds the service-name.
+     */
+    public function testExceptionWithServiceName()
+    {
+        $serviceName = 'TEST_SERVICE_NAME';
+        $exception = new CircuitException($serviceName);
+        $this->assertEquals($serviceName, $exception->getServiceName());
+    }
+}