Fix broken tests in develop

Author: narfbg

composer.json

@@ -30,6 +30,6 @@
 	},
 	"require-dev": {
 		"mikey179/vfsstream": "1.6.*",
-		"phpunit/phpunit": "5.* || 9.*"
+		"phpunit/phpunit": "4.* || 5.* || 9.*"
 	}
 }

tests/codeigniter/core/Input_test.php

@@ -26,14 +26,6 @@ public function tear_down()
 
 	// --------------------------------------------------------------------
 
-	public function tear_down()
-	{
-		$_POST = [];
-		$_GET = [];
-	}
-
-	// --------------------------------------------------------------------
-
 	public function test_get_not_exists()
 	{
 		$this->assertSame(array(), $this->input->get());

tests/codeigniter/core/Utf8_test.php

@@ -59,7 +59,7 @@ public function test_clean_string()
 		elseif (ICONV_ENABLED)
 		{
 			// This is a known issue, iconv doesn't always work with //IGNORE
-			$this->assertContains($this->utf8->clean_string($illegal_utf8), array('тест', ''));
+			$this->assertContains($utf8->clean_string($illegal_utf8), array('тест', ''));
 		}
 		else
 		{