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index 07b89402..fd36a529 100644
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+                "reference": "34369daee48eafb2651bea869b4b15d75ccc35f9",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.0",
-                "sebastian/diff": "^2.0",
-                "sebastian/exporter": "^3.0"
+                "sebastian/diff": "^2.0 || ^3.0",
+                "sebastian/exporter": "^3.1"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.0"
+                "phpunit/phpunit": "^6.4"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.0.x-dev"
+                    "dev-master": "2.1.x-dev"
                 }
             },
             "autoload": {
@@ -959,13 +968,13 @@
                 }
             ],
             "description": "Provides the functionality to compare PHP values for equality",
-            "homepage": "http://www.github.com/sebastianbergmann/comparator",
+            "homepage": "https://github.com/sebastianbergmann/comparator",
             "keywords": [
                 "comparator",
                 "compare",
                 "equality"
             ],
-            "time": "2017-08-03T07:14:59+00:00"
+            "time": "2018-02-01 13:46:46"
         },
         {
             "name": "sebastian/diff",
@@ -1017,7 +1026,7 @@
             "keywords": [
                 "diff"
             ],
-            "time": "2017-08-03T08:09:46+00:00"
+            "time": "2017-08-03 08:09:46"
         },
         {
             "name": "sebastian/environment",
@@ -1067,7 +1076,7 @@
                 "environment",
                 "hhvm"
             ],
-            "time": "2017-07-01T08:51:00+00:00"
+            "time": "2017-07-01 08:51:00"
         },
         {
             "name": "sebastian/exporter",
@@ -1134,7 +1143,7 @@
                 "export",
                 "exporter"
             ],
-            "time": "2017-04-03T13:19:02+00:00"
+            "time": "2017-04-03 13:19:02"
         },
         {
             "name": "sebastian/global-state",
@@ -1185,7 +1194,7 @@
             "keywords": [
                 "global state"
             ],
-            "time": "2017-04-27T15:39:26+00:00"
+            "time": "2017-04-27 15:39:26"
         },
         {
             "name": "sebastian/object-enumerator",
@@ -1232,7 +1241,7 @@
             ],
             "description": "Traverses array structures and object graphs to enumerate all referenced objects",
             "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
-            "time": "2017-08-03T12:35:26+00:00"
+            "time": "2017-08-03 12:35:26"
         },
         {
             "name": "sebastian/object-reflector",
@@ -1277,7 +1286,7 @@
             ],
             "description": "Allows reflection of object attributes, including inherited and non-public ones",
             "homepage": "https://github.com/sebastianbergmann/object-reflector/",
-            "time": "2017-03-29T09:07:27+00:00"
+            "time": "2017-03-29 09:07:27"
         },
         {
             "name": "sebastian/recursion-context",
@@ -1330,7 +1339,7 @@
             ],
             "description": "Provides functionality to recursively process PHP variables",
             "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
-            "time": "2017-03-03T06:23:57+00:00"
+            "time": "2017-03-03 06:23:57"
         },
         {
             "name": "sebastian/resource-operations",
@@ -1372,7 +1381,7 @@
             ],
             "description": "Provides a list of PHP built-in functions that operate on resources",
             "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
-            "time": "2015-07-28T20:34:47+00:00"
+            "time": "2015-07-28 20:34:47"
         },
         {
             "name": "sebastian/version",
@@ -1415,7 +1424,7 @@
             ],
             "description": "Library that helps with managing the version number of Git-hosted PHP projects",
             "homepage": "https://github.com/sebastianbergmann/version",
-            "time": "2016-10-03T07:35:21+00:00"
+            "time": "2016-10-03 07:35:21"
         },
         {
             "name": "squizlabs/php_codesniffer",
@@ -1493,7 +1502,7 @@
                 "phpcs",
                 "standards"
             ],
-            "time": "2017-05-22T02:43:20+00:00"
+            "time": "2017-05-22 02:43:20"
         },
         {
             "name": "theseer/tokenizer",
@@ -1533,20 +1542,20 @@
                 }
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "time": "2017-04-07T12:08:54+00:00"
+            "time": "2017-04-07 12:08:54"
         },
         {
             "name": "webmozart/assert",
-            "version": "1.2.0",
+            "version": "1.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/webmozart/assert.git",
-                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f"
+                "reference": "0df1908962e7a3071564e857d86874dad1ef204a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/2db61e59ff05fe5126d152bd0655c9ea113e550f",
-                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/0df1908962e7a3071564e857d86874dad1ef204a",
+                "reference": "0df1908962e7a3071564e857d86874dad1ef204a",
                 "shasum": ""
             },
             "require": {
@@ -1583,7 +1592,7 @@
                 "check",
                 "validate"
             ],
-            "time": "2016-11-23T20:04:58+00:00"
+            "time": "2018-01-29 19:49:41"
         },
         {
             "name": "zendframework/zend-coding-standard",
@@ -1612,7 +1621,7 @@
                 "Coding Standard",
                 "zf"
             ],
-            "time": "2016-11-09T21:30:43+00:00"
+            "time": "2016-11-09 21:30:43"
         }
     ],
     "aliases": [],
diff --git a/test/PhpInputStreamTest.php b/test/PhpInputStreamTest.php
index aa3bbcf2..cf25e309 100644
--- a/test/PhpInputStreamTest.php
+++ b/test/PhpInputStreamTest.php
@@ -36,7 +36,7 @@ public function getFileContents()
         return file_get_contents($this->file);
     }
 
-    public function assertStreamContents($test, $message = null)
+    public function assertStreamContents($test, $message = '')
     {
         $content = $this->getFileContents();
         $this->assertSame($content, $test, $message);