Added PHPUnit as dev dependency, and support versions 5 and 6.

.travis.yml

@@ -16,4 +16,4 @@ install:
   - composer install --prefer-source --no-interaction
 
 script:
-  - phpunit --coverage-text
+  - vendor/bin/phpunit --coverage-text

README.md

@@ -19,6 +19,7 @@ generate structured (configuration) files on the fly.
     * [processTemplate()](#processtemplate)
     * [processDefinition()](#processdefinition)
 * [Install](#install)
+* [Tests](#tests)
 * [License](#license)
 
 ## Input data
@@ -200,7 +201,7 @@ If you want to see the usage help,
 simply invoke its help by calling like this:
 
 ```bash
-$ confgen 
+$ confgen
 ```
 
 If you have installed this via `$ composer require`, then you may have to
@@ -269,7 +270,7 @@ generate a output (configuration) file from the given [template file](#templates
 $confgen->processTemplate('template.twig', 'data.json');
 ```
 
-See also [templates section](#templates) above for more details on the 
+See also [templates section](#templates) above for more details on the
 The [input data](#input-data).
 
 #### processDefinition
@@ -295,6 +296,21 @@ The recommended way to install this library is [through composer](http://getcomp
 }
 ```
 
+## 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

@@ -19,5 +19,8 @@
         "twig/twig": "~1.14",
         "kzykhys/yaml-front-matter": "~1.0",
         "justinrainbow/json-schema": "~1.4"
+    },
+    "require-dev": {
+      "phpunit/phpunit": "~4.8.35 || ~5.7 || ~6.4"
     }
 }

tests/bootstrap.php

@@ -2,7 +2,9 @@
 
 require __DIR__ . '/../vendor/autoload.php';
 
-class TestCase extends PHPUnit_Framework_TestCase
+use PHPUnit\Framework\TestCase as BaseTestCase;
+
+class TestCase extends BaseTestCase
 {
 
 }