added test for configuration

src/Config/Configuration.php

@@ -2,6 +2,10 @@
 namespace BSR\Config;
 
 class Configuration {
+
+    /**
+     * @var BSR\Config\Configuration
+     */
     private static $instance = null;
 
     /**
@@ -19,28 +23,93 @@ class Configuration {
      */
     private $values = array();
 
-    private $custom_config_filename = 'configuration.local.php';
+    private $customConfigFilename = 'configuration.local.php';
 
-    private function __construct() {
+    private function __construct() 
-        // by default, set the session save path to the default value;
+    {
-        $this->values['session']['save_path'] = session_save_path();
+        if (!isset($this->values['session'])) {
+            $this->values['session'] = array();
+        }
 
-        if(!file_exists($this->custom_config_filename)) {
+        if (!isset($this->values['session']['save_path'])) {
-            throw new \RuntimeException('No configuration.local.php file was found. Create it with the proper config.');
+            $this->values['session']['save_path'] = session_save_path();
         }
-         
+    }
-        $configuration  = include_once realpath(dirname(__FILE__) . '/../config/') . $this->custom_config_filename;
 
-        if(!is_array($configuration)) {
+    /**
-            throw new \RuntimeException("You custom configuration in '{$this->custom_config_filename}' must be in a variable named '\$configuration' and be an array.");
+     *
+     * @return String
+     */
+    public function getCustomConfigFilePath()
+    {
+        return realpath(dirname(__FILE__) . '/../../../../../config/') . $this->customConfigFilename;
+    }
+
+    /**
+     * @return array
+     * @throws \RuntimeException
+     */
+    public function getCustomConfigFromFile()
+    {
+        if (!file_exists($this->getCustomConfigFilePath())) {
+            throw new \RuntimeException("The file : {$this->getCustomConfigFilePath()} does not exist");
         }
+        return include $this->getCustomConfigFilePath();
+    }
 
-        $this->values = array_replace_recursive($this->values, $configuration);
+    /**
+     *
+     * @return void
+     * @throws \RuntimeException
+     */
+    public function loadCustomConfigFromFile()
+    {
+        $this->setCustomConfig($this->getCustomConfigFromFile());
+    }
+
+    /**
+     * @param array $config
+     * @return void
+     */
+    public function setCustomConfig(array $config)
+    {
+        $this->values = array_replace_recursive($this->values, $config);
     }
 
-    private function dotNotationAccess($data, $key, $default=null)
+    /**
+     * @return array
+     */
+    public function getConfig()
+    {
+        return $this->values;
+    }
+
+    /**
+     * Checks whether the nested key exists
+     *
+     * @param array $data
+     * @param array $keys 
+     * @return boolean 
+     */
+    public static function existsKeys(array $data, array $keys)
+    {
+        foreach ($keys as $k) {
+            if (!isset($data[$k])) {
+                return false;
+            }
+            $data = $data[$k];
+        }
+        return true;
+    }
+
+    /**
+     * @param array $data
+     * @param array $keys 
+     * @param any $default
+     * @return boolean 
+     */
+    public static function fetchRecursive(array $data, array $keys, $default = null)
     {
-        $keys = explode('.', $key);
         foreach ($keys as $k) {
             if (!is_array($data)) {
                 throw new \Exception("Try to access non-array as array, key '$key''");
@@ -48,26 +117,62 @@ class Configuration {
             if (!isset($data[$k])) {
                 return $default;
             }
-
             $data = $data[$k];
         }
         return $data;
     }
 
-    private function value($name, $default) {
+    /**
-        return $this->dotNotationAccess($this->values, $name, $default);
+     * Return array of keys if dot notation string is passed
+     * @param string|array $keys
+     */
+    public static function parseKeys($keys)
+    {
+        if (is_string($keys)) {
+            $keys = explode('.', $keys);
+        } else if (!is_array($keys)) {
+            throw new \RuntimeException('Unsupported $keys paramater type');
+        }
+        return $keys;
+    }
+
+    /**
+     * @return string
+     * @throws \Exception
+     */
+    public function value($keys, $default)
+    {
+        return self::fetchRecursive($this->values, self::parseKeys($keys), $default);
     }
 
+    /**
+     * @return boolean
+     */
+    public static function has($keys)
+    {
+        return self::existsKeys(self::get(), self::parseKeys($keys));
+    }
     /**
      * @param $name
      * @param mixed $default the default value for your configuration option
      * @return mixed return the configuration value if the key is find, the default otherwise
      */
-    public static function get($name, $default = null) {
+    public static function get($name = null, $default = null)
+    {
+        if (null === $name) {
+            return self::getInstance()->getConfig();
+        }
+        return self::getInstance()->value($name, $default);
+    }
+
+    /**
+     * @return BSR\Config\Configuration
+     */
+    public static function getInstance()
+    {
         if(is_null(self::$instance)) {
             self::$instance = new Configuration();
         }
-
+        return self::$instance;
-        return self::$instance->value($name, $default);
     }
 }

tests/Config/ConfigurationTest.php

@@ -0,0 +1,116 @@
+<?php
+namespace BSR\Config;
+
+use PHPUnit\Framework\TestCase;
+
+class ConfigurationTest extends TestCase
+{
+    protected $testConfig = array(
+        'session' => 'override',
+        'a' => array(
+            'b' => array(
+                'c' => 'C', 
+                'c2' => 'D'
+            )
+        ),
+    );
+
+    protected $defaultConfig;
+
+    public function setUp()
+    {
+        $this->defaultConfig = array('session' => array('save_path' => session_save_path()));
+    }
+
+    public function testConfigurationInstanceIsTheSame()
+    {
+        $this->assertSame(Configuration::getInstance(), Configuration::getInstance());
+    }
+
+    public function testInitialDefaultConfigContainsOnlyDefaultSessionSavePath()
+    {
+        $this->assertSame(Configuration::getInstance()->getConfig(), $this->defaultConfig);
+    }
+
+    public function testConfigChangesAfterSettingCustomConfig()
+    {
+        $preConfig = Configuration::getInstance()->getConfig();
+        Configuration::getInstance()->setCustomConfig($this->testConfig);
+        $postConfig = Configuration::getInstance()->getConfig();
+        $this->assertNotSame($preConfig, $postConfig);
+    }
+
+    public function testCustomConfigGetsMergedProperly()
+    {
+        Configuration::getInstance()->setCustomConfig($this->testConfig);
+        $this->assertSame(Configuration::getInstance()->getConfig(), $this->testConfig);
+    }
+
+    public function testReturnsFalseIfHasKeyButNotMostNestedKey()
+    {
+        Configuration::getInstance()->setCustomConfig($this->defaultConfig);
+        Configuration::getInstance()->setCustomConfig($this->testConfig);
+        $this->assertEquals(Configuration::has(array('session', 'save_path')), false);
+    }
+
+    public function testReturnsFalseIfHasNotInitialKeyButHasNestedKey()
+    {
+        Configuration::getInstance()->setCustomConfig($this->defaultConfig);
+        $this->assertEquals(Configuration::has(array('z', 'save_path')), false);
+    }
+
+    public function testReturnsFalseIfHasNoneOfKeyPath()
+    {
+        Configuration::getInstance()->setCustomConfig($this->defaultConfig);
+        $this->assertEquals(Configuration::has(array('z', 'w')), false);
+    }
+
+    public function testReturnsTrueIfHasKeyPath()
+    {
+        Configuration::getInstance()->setCustomConfig($this->defaultConfig);
+        $this->assertEquals(Configuration::has(array('session', 'save_path')), true);
+    }
+
+    public function testCanGetNestedKeyValueFromKeysList()
+    {
+        Configuration::getInstance()->setCustomConfig($this->defaultConfig);
+        $this->assertSame(
+            Configuration::get(array('session', 'save_path')),
+            $this->defaultConfig['session']['save_path']
+        );
+    }
+
+    public function testReturnsDefaultParamIfKeyNotSet()
+    {
+        Configuration::getInstance()->setCustomConfig($this->defaultConfig);
+        $default = "some_random_thing";
+        $this->assertSame(
+            Configuration::get(array('x', 'y'), $default),
+            $default
+        );
+    }
+
+    public function testKeysInDotNotationGetConvertedToKeysArray()
+    {
+        $this->assertSame(
+            Configuration::parseKeys('a.b.c'), 
+            array('a', 'b', 'c')
+        );
+    }
+
+    public function testKeysInDotNotationGetsSameResult()
+    {
+        Configuration::getInstance()->setCustomConfig($this->defaultConfig);
+        Configuration::getInstance()->setCustomConfig($this->testConfig);
+        $this->assertSame(
+            Configuration::get('a.b.c'), 
+            Configuration::get(array('a', 'b', 'c'))
+        );
+    }
+
+    public function testGetWithoutParamReturnsFullConfigArray()
+    {
+        Configuration::getInstance()->setCustomConfig($this->testConfig);
+        $this->assertSame(Configuration::get(), $this->testConfig);
+    }
+}