test interface_exists()

Author: staabm

Diff for: tests/PHPStan/Rules/Classes/data/remember-class-exists-from-constructor.php

@@ -3,8 +3,9 @@
 namespace RememberClassExistsFromConstructor;
 
 use SomeUnknownClass;
+use SomeUnknownInterface;
 
-class User
+class UserWithClass
 {
 	public function __construct(
 	) {
@@ -22,3 +23,22 @@ public function doFoo($m): bool
 	}
 
 }
+
+class UserWithInterface
+{
+	public function __construct(
+	) {
+		if (!interface_exists('SomeUnknownInterface')) {
+			throw new \LogicException();
+		}
+	}
+
+	public function doFoo($m): bool
+	{
+		if ($m instanceof SomeUnknownInterface) {
+			return false;
+		}
+		return true;
+	}
+
+}