Update PHPUnit and bring test code into line.

Author: petercoles

composer.json

@@ -20,8 +20,8 @@
     "illuminate/support": "~5|~6"
   },
   "require-dev": {
-    "phpunit/phpunit": ">=5.3",
-    "mockery/mockery": ">=0.9.4"
+    "phpunit/phpunit": "^8",
+    "mockery/mockery": "^1"
   },
   "autoload": {
     "psr-4": {

phpunit.xml

@@ -8,7 +8,6 @@
          convertWarningsToExceptions="true"
          processIsolation="false"
          stopOnFailure="false"
-         syntaxCheck="false"
 >
     <testsuites>
         <testsuite name="Package Test Suite">

tests/FilterTest.php

@@ -1,10 +1,12 @@
 <?php
 
-class FilterTest extends \PHPUnit_Framework_TestCase
+use PHPUnit\Framework\TestCase;
+
+class FilterTest extends TestCase
 {
     protected $maker;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->maker = new PeterColes\Languages\Maker;
     }

tests/KeyValueTest.php

@@ -1,10 +1,12 @@
 <?php
 
-class KeyValueTest extends \PHPUnit_Framework_TestCase
+use PHPUnit\Framework\TestCase;
+
+class KeyValueTest extends TestCase
 {
     protected $maker;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->maker = new PeterColes\Languages\Maker;
     }

tests/LookupTest.php

@@ -1,10 +1,12 @@
 <?php
 
-class LookupTest extends \PHPUnit_Framework_TestCase
+use PHPUnit\Framework\TestCase;
+
+class LookupTest extends TestCase
 {
     protected $maker;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->maker = new PeterColes\Languages\Maker;
     }

tests/MixedLocaleTest.php

@@ -1,10 +1,12 @@
 <?php
 
-class MixedLocaleTest extends \PHPUnit_Framework_TestCase
+use PHPUnit\Framework\TestCase;
+
+class MixedLocaleTest extends TestCase
 {
     protected $maker;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->maker = new PeterColes\Languages\Maker;
     }