From 421a2393d0f5118cb69132d1be0fa8a7aae52546 Mon Sep 17 00:00:00 2001
From: Aidan Woods <aidantwoods@gmail.com>
Date: Fri, 15 Oct 2021 23:18:08 +0100
Subject: [PATCH] StateBearer must be constructable from State

---
 src/State.php           |  6 ++++++
 src/StateBearer.php     |  2 ++
 tests/src/StateTest.php | 12 ++++++++++++
 3 files changed, 20 insertions(+)

diff --git a/src/State.php b/src/State.php
index 532a287..55792c3 100644
--- a/src/State.php
+++ b/src/State.php
@@ -107,6 +107,12 @@ final class State implements StateBearer
         return $this;
     }
 
+    /** @return self */
+    public static function fromState(State $State)
+    {
+        return $State;
+    }
+
     public function isolatedCopy(): self
     {
         return new self(\array_map(
diff --git a/src/StateBearer.php b/src/StateBearer.php
index f0f9190..dc29cf3 100644
--- a/src/StateBearer.php
+++ b/src/StateBearer.php
@@ -5,4 +5,6 @@ namespace Erusev\Parsedown;
 interface StateBearer
 {
     public function state(): State;
+    /** @return static */
+    public static function fromState(State $State);
 }
diff --git a/tests/src/StateTest.php b/tests/src/StateTest.php
index babb419..b9631f6 100644
--- a/tests/src/StateTest.php
+++ b/tests/src/StateTest.php
@@ -39,4 +39,16 @@ final class StateTest extends TestCase
     {
         $this->assertInstanceOf(State::class, clone(new State));
     }
+
+    /**
+     * @return void
+     * @throws \PHPUnit\Framework\Exception
+     * @throws \SebastianBergmann\RecursionContext\InvalidArgumentException
+     */
+    public function testStateFromStateIdentical()
+    {
+        $State = new State;
+
+        $this->assertSame($State, State::fromState($State));
+    }
 }