<?php

namespace Tests;


class TestCase extends \PHPUnit\Framework\TestCase
{
    protected function loadFixture($filename)
    {
        $path = __DIR__ . '/fixtures/' . $filename;
        if (file_exists($path)) {
            return file_get_contents($path);
        }

        return null;
    }
}
<?php

namespace Tests;


use PHPUnit_Framework_TestCase;

class TestCase extends PHPUnit_Framework_TestCase
{
    protected function loadFixture($filename)
    {
        $path = __DIR__ . '/fixtures/' . $filename;
        if (file_exists($path)) {
            return file_get_contents($path);
        }

        return null;
    }
}
--- 
+++ 
@@ -3,9 +3,7 @@
 namespace Tests;
 
 
-use PHPUnit_Framework_TestCase;
-
-class TestCase extends PHPUnit_Framework_TestCase
+class TestCase extends \PHPUnit\Framework\TestCase
 {
     protected function loadFixture($filename)
     {
Fix run tests in php7
