Fix SetTo not setting properties that are not present on the source o…

…bject

See #53

src/MappingOperation/Implementations/SetTo.php

@@ -33,4 +33,12 @@ protected function getSourceValue($source, string $propertyName)
     {
         return $this->value;
     }
+
+    /**
+     * @inheritdoc
+     */
+    protected function canMapProperty(string $propertyName, $source): bool
+    {
+        return true;
+    }
 }

test/MappingOperation/Implementations/SetToTest.php

@@ -4,6 +4,7 @@
 
 use AutoMapperPlus\Configuration\Options;
 use AutoMapperPlus\Test\Models\SimpleProperties\Destination;
+use AutoMapperPlus\Test\Models\SimpleProperties\DestinationAlt;
 use AutoMapperPlus\Test\Models\SimpleProperties\Source;
 use PHPUnit\Framework\TestCase;
 
@@ -25,4 +26,17 @@ public function testItMapsAProperty()
 
         $this->assertEquals('always the same value', $destination->name);
     }
+
+    public function testItDoesntNeedTheSourceProperty()
+    {
+        $operation = new SetTo('always the same value');
+        $operation->setOptions(Options::default());
+        $source = new Source();
+        $destination = new DestinationAlt();
+
+        // anotherProperty is not present on the source object.
+        $operation->mapProperty('anotherProperty', $source, $destination);
+
+        $this->assertEquals('always the same value', $destination->anotherProperty);
+    }
 }