Add PHPUnit to require-dev

Author: clue

.travis.yml

@@ -1,9 +1,12 @@
 language: php
+
 php:
   - 5.3
   - 5.6
   - hhvm
+
 install:
-  - composer install --prefer-source --no-interaction
+  - composer install --no-interaction
+
 script:
-  - phpunit --coverage-text
+  - vendor/bin/phpunit --coverage-text

README.md

@@ -17,6 +17,7 @@ A trivial implementation of timeouts for `Promise`s, built on top of [React PHP]
     * [Reject cancellation](#reject-cancellation)
   * [TimeoutException](#timeoutexception)
 * [Install](#install)
+* [Tests](#tests)
 * [License](#license)
 
 ## Usage
@@ -325,6 +326,21 @@ $ composer require react/promise-timer:^1.1.1
 
 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](http://getcomposer.org):
+
+```bash
+$ composer install
+```
+
+To run the test suite, go to the project root and run:
+
+```bash
+$ php vendor/bin/phpunit
+```
+
 ## License
 
 MIT

composer.json

@@ -21,5 +21,8 @@
         "php": ">=5.3",
         "react/event-loop": "^0.4 || ^0.3.5",
         "react/promise": "~2.1|~1.2"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^4.8"
     }
 }