update phpunit configuration

Author: jaredchu

.travis.yml

@@ -22,7 +22,7 @@ install:
   - composer install
 
 script:
-  - phpunit --coverage-text --coverage-clover=coverage.clover
+  - vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
 
 after_success:
   - bash <(curl -s https://codecov.io/bash)

composer.json

@@ -14,6 +14,9 @@
         "netresearch/jsonmapper": "^1.1",
         "jaredchu/jc-request": "^1.0"
     },
+    "require-dev": {
+        "phpunit/phpunit": "^4.0 || ^5.0"
+    },
     "autoload": {
       "psr-4": {
         "JCFirebase\\": "src"

tests/FirebaseModelTest.php

@@ -15,7 +15,7 @@
 class FirebaseModelTest extends PHPUnit_Framework_TestCase
 {
     const FIREBASE_URI = 'https://fir-php-test-c7fa2.firebaseio.com/';
-    const KEY_FILE = __DIR__ . '/../resource/firebase-php-test-0a49b34e5f4a.json';
+    const KEY_FILE = '/../resource/firebase-php-test-0a49b34e5f4a.json';
 
     /**
      * @var JCFirebase
@@ -24,7 +24,7 @@ class FirebaseModelTest extends PHPUnit_Framework_TestCase
 
     public static function setUpBeforeClass()
     {
-        self::$firebase = JCFirebase::fromKeyFile(self::FIREBASE_URI, self::KEY_FILE);
+        self::$firebase = JCFirebase::fromKeyFile(self::FIREBASE_URI, __DIR__ . self::KEY_FILE);
     }
 
     public function testCreateLog()

tests/JCFirebaseTest.php

@@ -16,7 +16,7 @@
 class JCFirebaseTest extends PHPUnit_Framework_TestCase
 {
     const FIREBASE_URI = 'https://fir-php-test-c7fa2.firebaseio.com/';
-    const KEY_FILE = __DIR__ . '/../resource/firebase-php-test-0a49b34e5f4a.json';
+    const KEY_FILE = '/../resource/firebase-php-test-0a49b34e5f4a.json';
 
     /**
      * @var JCFirebase
@@ -25,7 +25,7 @@ class JCFirebaseTest extends PHPUnit_Framework_TestCase
 
     public static function setUpBeforeClass()
     {
-        self::$firebase = JCFirebase::fromKeyFile(self::FIREBASE_URI, self::KEY_FILE);
+        self::$firebase = JCFirebase::fromKeyFile(self::FIREBASE_URI, __DIR__ . self::KEY_FILE);
     }
 
     public function testGetPathURI()