Forward compatibility with PHPUnit 5 and PHPUnit 6

Author: clue

README.md

@@ -23,6 +23,7 @@ provide alternate implementations.
   * [Fallback get](#fallback-get)
   * [Fallback-get-and-set](#fallback-get-and-set)
 * [Install](#install)
+* [Tests](#tests)
 * [License](#license)
 
 ## Usage
@@ -150,6 +151,21 @@ $ composer require "react/cache:~0.4.0|~0.3.0"
 
 More details and upgrade guides can be found in the [CHANGELOG](CHANGELOG.md).
 
+## Tests
+
+To run the test suite, you first need to clone this repo and then install all
+dependencies [through Composer](https://getcomposer.org):
+
+```bash
+$ composer install
+```
+
+To run the test suite, go to the project root and run:
+
+```bash
+$ php vendor/bin/phpunit
+```
+
 ## License
 
 MIT, see [LICENSE file](LICENSE).

composer.json

@@ -14,6 +14,6 @@
         "psr-4": { "React\\Tests\\Cache\\": "tests/" }
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.8"
+        "phpunit/phpunit": "^6.4 || ^5.7 || ^4.8.35"
     }
 }

tests/TestCase.php

@@ -2,7 +2,9 @@
 
 namespace React\Tests\Cache;
 
-class TestCase extends \PHPUnit_Framework_TestCase
+use PHPUnit\Framework\TestCase as BaseTestCase;
+
+class TestCase extends BaseTestCase
 {
     protected function expectCallableExactly($amount)
     {
@@ -36,6 +38,6 @@ protected function expectCallableNever()
 
     protected function createCallableMock()
     {
-        return $this->getMock('React\Tests\Cache\CallableStub');
+        return $this->getMockBuilder('React\Tests\Cache\CallableStub')->getMock();
     }
 }