Avoid global fallback for mocking built in functions

tests/TerminalObject/Basic/DumpTest.php

@@ -3,8 +3,7 @@
 namespace League\CLImate\Tests\TerminalObject\Basic;
 
 use League\CLImate\Tests\TestBase;
-
-require_once 'VarDumpMock.php';
+use Mockery;
 
 class DumpTest extends TestBase
 {
@@ -14,7 +13,10 @@ class DumpTest extends TestBase
      */
     public function it_can_dump_a_variable()
     {
-        $this->shouldWrite("\e[mDUMPED: This thing\e[0m");
+        $this->output->shouldReceive("write")->once()->with(Mockery::on(function ($content) {
+            return (bool) strpos($content, "string(10) \"This thing\"");
+        }));
+
         $this->shouldHavePersisted();
 
         $this->cli->dump('This thing');

tests/TerminalObject/Helper/SleeperTest.php

@@ -3,61 +3,55 @@
 namespace League\CLImate\Tests\TerminalObject\Helper;
 
 use League\CLImate\TerminalObject\Helper\Sleeper;
-use League\CLImate\Tests\TestBase;
+use PHPUnit\Framework\TestCase;
 
-require_once 'SleeperGlobalMock.php';
-
-class SleeperTest extends TestBase
+class SleeperTest extends TestCase
 {
-    /**
-     * @test
-     * @doesNotPerformAssertions
-     */
-    public function it_can_slow_down_the_sleeper_speed()
+    public function setUp(): void
     {
-        $sleeper = new Sleeper();
+        if (\PHP_OS_FAMILY === "Windows") {
+            $this->markTestSkipped();
+        }
+    }
 
-        $sleeper->speed(50);
 
-        self::$functions->shouldReceive('usleep')
-                        ->once()
-                        ->with(100000);
+    private function assertSleep($expected, $speed)
+    {
+        $sleeper = new Sleeper();
+
+        $sleeper->speed($speed);
 
+        $start = microtime(true);
         $sleeper->sleep();
+        $result = (microtime(true) - $start) * 1000000;
+
+        $this->assertGreaterThan($expected * 0.9, $result);
+        $this->assertLessThan($expected * 1.1, $result);
     }
 
+
     /**
      * @test
-     * @doesNotPerformAssertions
      */
-    public function it_can_speed_up_the_sleeper_speed()
+    public function it_can_slow_down_the_sleeper_speed()
     {
-        $sleeper = new Sleeper();
-
-        $sleeper->speed(200);
-
-        self::$functions->shouldReceive('usleep')
-                        ->once()
-                        ->with(25000);
+        $this->assertSleep(100000, 50);
+    }
 
-        $sleeper->sleep();
+    /**
+     * @test
+     */
+    public function it_can_speed_up_the_sleeper_speed()
+    {
+        $this->assertSleep(25000, 200);
     }
 
     /**
      * @test
-     * @doesNotPerformAssertions
      */
     public function it_will_ignore_zero_percentages()
     {
-        $sleeper = new Sleeper();
-
-        $sleeper->speed(0);
-
-        self::$functions->shouldReceive('usleep')
-                        ->once()
-                        ->with(50000);
-
-        $sleeper->sleep();
+        $this->assertSleep(50000, 0);
     }