Add support for arg defaultValue (#98)

Author: simPod

src/Builder/FieldBuilder.php

@@ -37,16 +37,22 @@ public function setDescription(string $description): self
     }
 
     /**
+     * @param mixed $defaultValue
+     *
      * @return static
      */
-    public function addArgument(string $name, Type $type, ?string $description = null): self
+    public function addArgument(string $name, Type $type, ?string $description = null, $defaultValue = null): self
     {
         $this->parameters['args'][$name] = ['type' => $type];
 
         if ($description !== null) {
             $this->parameters['args'][$name]['description'] = $description;
         }
 
+        if ($defaultValue !== null) {
+            $this->parameters['args'][$name]['defaultValue'] = $defaultValue;
+        }
+
         return $this;
     }
 

tests/Builder/FieldBuilderTest.php

@@ -20,7 +20,7 @@ static function (): string {
                     return 'Resolver result';
                 }
             )
-            ->addArgument('arg1', Type::int(), 'Argument Description')
+            ->addArgument('arg1', Type::int(), 'Argument Description', 1)
             ->build();
 
         self::assertSame('SomeField', $field['name']);
@@ -36,5 +36,6 @@ static function (): string {
         self::assertArrayHasKey('arg1', $args);
         self::assertSame(Type::int(), $args['arg1']['type']);
         self::assertSame('Argument Description', $args['arg1']['description']);
+        self::assertSame(1, $args['arg1']['defaultValue']);
     }
 }