Add more tests to Config() class.

src/Util/ApplyConfig.php

@@ -2,20 +2,12 @@
 namespace Consolidation\Config\Util;
 
 /**
- * Fetch a configuration value from a configuration group. If the
- * desired configuration value is not found in the most specific
- * group named, keep stepping up to the next parent group until a
- * value is located.
+ * Given an object that contains configuration methods, inject any
+ * configuration found in the configuration file.
  *
- * Given the following constructor inputs:
- *   - $prefix  = "command."
- *   - $group   = "foo.bar.baz"
- *   - $postfix = ".options."
- * Then the `get` method will then consider, in order:
- *   - command.foo.bar.baz.options
- *   - command.foo.bar.options
- *   - command.foo.options
- * If any of these contain an option for "$key", then return its value.
+ * The proper use for this method is to call setter methods of the
+ * provided object. Using configuration to call methods that do work
+ * is an abuse of this mechanism.
  */
 class ApplyConfig
 {
@@ -31,13 +23,6 @@ public function __construct($config, $group, $prefix = '', $postfix = '.')
     }
 
     /**
-     * Given an object that contains configuration methods, inject any
-     * configuration found in the configuration file.
-     *
-     * The proper use for this method is to call setter methods of the
-     * provided object. Using configuration to call methods that do work
-     * is an abuse of this mechanism.
-     *
      * TODO: We could use reflection to test to see if the return type
      * of the provided object is a reference to the object itself. All
      * setter methods should do this. This test is insufficient to guarentee

tests/ConfigTest.php

@@ -3,6 +3,26 @@
 
 class ConfigTest extends \PHPUnit_Framework_TestCase
 {
+    public function testDefault()
+    {
+        $data = [
+            'a' => 'foo',
+            'b' => 'bar',
+            'c' => 'boz',
+        ];
+
+        $config = new Config($data);
+
+        $config->setDefault('c', 'other');
+        $config->setDefault('d', 'other');
+
+        $this->assertEquals('foo', $config->get('a'));
+        $this->assertEquals('boz', $config->get('c'));
+        $this->assertEquals('other', $config->get('d'));
+        $this->assertEquals('other', $config->getDefault('c'));
+        $this->assertEquals('', $config->get('e'));
+    }
+
     public function testConfigurationWithCrossFileReferences()
     {
         $config = new Config();