[OptionsResolver] Added methods isKnown() and isRequired()

src/Symfony/Component/OptionsResolver/OptionsResolver.php

@@ -198,6 +198,35 @@ class OptionsResolver
         return $this;
     }
 
+    /**
+     * Returns whether an option is known.
+     *
+     * An option is known if it has been passed to either {@link setDefaults()},
+     * {@link setRequired()} or {@link setOptional()} before.
+     *
+     * @param  string $option The name of the option.
+     * @return Boolean        Whether the option is known.
+     */
+    public function isKnown($option)
+    {
+        return isset($this->knownOptions[$option]);
+    }
+
+    /**
+     * Returns whether an option is required.
+     *
+     * An option is required if it has been passed to {@link setRequired()},
+     * but not to {@link setDefaults()}. That is, the option has been declared
+     * as required and no default value has been set.
+     *
+     * @param  string $option The name of the option.
+     * @return Boolean        Whether the option is required.
+     */
+    public function isRequired($option)
+    {
+        return isset($this->requiredOptions[$option]) && !isset($this->defaultOptions[$option]);
+    }
+
     /**
      * Returns the combination of the default and the passed options.
      *

src/Symfony/Component/OptionsResolver/Tests/OptionResolverTest.php

@@ -314,4 +314,62 @@ class OptionsResolverTest extends \PHPUnit_Framework_TestCase
             'two' => '2',
         ), $this->resolver->resolve($options));
     }
+
+    public function testKnownIfDefaultWasSet()
+    {
+        $this->assertFalse($this->resolver->isKnown('foo'));
+
+        $this->resolver->setDefaults(array(
+            'foo' => 'bar',
+        ));
+
+        $this->assertTrue($this->resolver->isKnown('foo'));
+    }
+
+    public function testKnownIfRequired()
+    {
+        $this->assertFalse($this->resolver->isKnown('foo'));
+
+        $this->resolver->setRequired(array(
+            'foo',
+        ));
+
+        $this->assertTrue($this->resolver->isKnown('foo'));
+    }
+
+    public function testKnownIfOptional()
+    {
+        $this->assertFalse($this->resolver->isKnown('foo'));
+
+        $this->resolver->setOptional(array(
+            'foo',
+        ));
+
+        $this->assertTrue($this->resolver->isKnown('foo'));
+    }
+
+    public function testRequiredIfRequired()
+    {
+        $this->assertFalse($this->resolver->isRequired('foo'));
+
+        $this->resolver->setRequired(array(
+            'foo',
+        ));
+
+        $this->assertTrue($this->resolver->isRequired('foo'));
+    }
+
+    public function testNotRequiredIfRequiredAndDefaultValue()
+    {
+        $this->assertFalse($this->resolver->isRequired('foo'));
+
+        $this->resolver->setRequired(array(
+            'foo',
+        ));
+        $this->resolver->setDefaults(array(
+            'foo' => 'bar',
+        ));
+
+        $this->assertFalse($this->resolver->isRequired('foo'));
+    }
 }