Laravel 5.6 updates

Travis config update

Removed HHVM script as Laravel no longer support HHVM after releasing 5.3

vendor/sebastian/diff/tests/Exception/ConfigurationExceptionTest.php

@@ -0,0 +1,41 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SebastianBergmann\Diff;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers SebastianBergmann\Diff\ConfigurationException
+ */
+final class ConfigurationExceptionTest extends TestCase
+{
+    public function testConstructWithDefaults(): void
+    {
+        $e = new ConfigurationException('test', 'A', 'B');
+
+        $this->assertSame(0, $e->getCode());
+        $this->assertNull($e->getPrevious());
+        $this->assertSame('Option "test" must be A, got "string#B".', $e->getMessage());
+    }
+
+    public function testConstruct(): void
+    {
+        $e = new ConfigurationException(
+            'test',
+            'integer',
+            new \SplFileInfo(__FILE__),
+            789,
+            new \BadMethodCallException(__METHOD__)
+        );
+
+        $this->assertSame('Option "test" must be integer, got "SplFileInfo".', $e->getMessage());
+    }
+}