Merge pull request #197 from jwage/phpunit8-upgrade

Upgrade to PHPUnit 8.

Author: jwage

.gitignore

@@ -1,5 +1,6 @@
-vendor/
-build/
+/vendor
+/build
 /phpcs.xml
 /.phpcs-cache
-infection.log
+/infection.log
+/.phpunit.result.cache

composer.json

@@ -25,7 +25,7 @@
         "infection/infection": "^0.12.2",
         "phpstan/phpstan": "^0.11",
         "phpstan/phpstan-phpunit": "^0.11",
-        "phpunit/phpunit": "^7.0",
+        "phpunit/phpunit": "^8.0",
         "vimeo/psalm": "^3.2.2"
     },
     "config": {

composer.lock

@@ -205,7 +205,7 @@ public function testSlice() : void
         $this->collection[] = 'three';
 
         $slice = $this->collection->slice(0, 1);
-        self::assertInternalType('array', $slice);
+        self::assertIsArray($slice);
         self::assertEquals(['one'], $slice);
 
         $slice = $this->collection->slice(1);