Restore is default method (#482)

* Restore is default method

* Add changelog entry

Author: jderusse

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Change Log
 
+## 0.5.1
+
+### Added
+
+- Add `Configuration::isDefault` methods.
+
 ## 0.5.0
 
 ### Added

src/Configuration.php

@@ -126,4 +126,13 @@ public function has(string $name): bool
 
         return isset($this->data[$name]);
     }
+
+    public function isDefault(string $name): bool
+    {
+        if (!isset(self::AVAILABLE_OPTIONS[$name])) {
+            throw new InvalidArgument(\sprintf('Invalid option "%s" passed to "%s::%s". ', $name, __CLASS__, __METHOD__));
+        }
+
+        return isset($this->data[$name], self::DEFAULT_OPTIONS[$name]) && $this->data[$name] === self::DEFAULT_OPTIONS[$name];
+    }
 }

tests/Unit/ConfigurationTest.php

@@ -30,6 +30,14 @@ public function testCreate($config, $env, $expected)
         }
     }
 
+    public function testIsDefault()
+    {
+        $config = Configuration::create(['region' => 'eu-west-3']);
+
+        self::assertTrue($config->isDefault('endpoint'));
+        self::assertFalse($config->isDefault('region'));
+    }
+
     public function provideConfiguration(): iterable
     {
         yield 'simple config' => [['endpoint' => 'foo'], [], ['endpoint' => 'foo']];