[SOAP-13] Create missing InvalidConfigurationException tests

Author: lucasppons

.travis.yml

@@ -13,4 +13,4 @@ script:
 after_script:
   - mkdir -p build/logs
   - vendor/bin/phpunit --coverage-clover build/logs/clover.xml
-  - php vendor/bin/coveralls -v
+  - vendor/bin/php-coveralls --exclude-no-stmt -v

tests/Exceptions/InvalidConfigurationExceptionTest.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Tests\Exceptions;
+
+use Tests\TestCase;
+use Symfony\Component\HttpFoundation\Response;
+use SoapBox\SignedRequests\Exceptions\InvalidConfigurationException;
+
+class InvalidConfigurationExceptionTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function an_invalid_configuration_exception_is_constructed_with_a_default_message()
+    {
+        $exception = new InvalidConfigurationException();
+        $this->assertEquals(InvalidConfigurationException::MESSAGE, $exception->getMessage());
+    }
+
+    /**
+     * @test
+     */
+    public function the_message_for_the_exception_can_be_overwritten_during_construction()
+    {
+        $message = "So broken";
+        $exception = new InvalidConfigurationException($message);
+        $this->assertNotEquals(InvalidConfigurationException::MESSAGE, $exception->getMessage());
+        $this->assertEquals($message, $exception->getMessage());
+    }
+
+    /**
+     * @test
+     */
+    public function it_returns_a_bad_request_status_code()
+    {
+        $exception = new InvalidConfigurationException();
+        $this->assertEquals(Response::HTTP_UNPROCESSABLE_ENTITY, $exception->getStatusCode());
+    }
+
+    /**
+     * @test
+     */
+    public function it_returns_an_empty_set_of_response_headers()
+    {
+        $exception = new InvalidConfigurationException();
+        $this->assertEmpty($exception->getHeaders());
+    }
+}