Fixes issue 187

See inertiajs/inertia#187

Author: claudiodekker

src/ResponseFactory.php

@@ -46,7 +46,11 @@ public function version($version)
 
     public function getVersion()
     {
-        return $this->version instanceof Closure ? App::call($this->version) : $this->version;
+        $version = $this->version instanceof Closure
+            ? App::call($this->version)
+            : $this->version;
+
+        return (string) $version;
     }
 
     public function render($component, $props = [])

tests/MiddlewareTest.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Inertia\Tests;
+
+use Illuminate\Foundation\Testing\TestResponse;
+use Illuminate\Http\Request;
+use Inertia\Inertia;
+use Inertia\Middleware;
+
+class MiddlewareTest extends TestCase
+{
+    public function test_the_version_can_be_a_number()
+    {
+        Inertia::version(1597347897973);
+
+        $request = Request::create('/user/123', 'GET');
+        $request->headers->add(['X-Inertia' => 'true']);
+        $request->headers->add(['X-Inertia-Version' => 1597347897973]);
+
+        $response = $this->makeMockResponse($request);
+
+        $response->assertSuccessful();
+        $response->assertJson([
+            'component' => 'User/Edit',
+        ]);
+    }
+
+    public function test_the_version_can_be_a_string()
+    {
+        Inertia::version('foo-version');
+
+        $request = Request::create('/user/edit', 'GET');
+        $request->headers->add(['X-Inertia' => 'true']);
+        $request->headers->add(['X-Inertia-Version' => 'foo-version']);
+
+        $response = $this->makeMockResponse($request);
+
+        $response->assertSuccessful();
+        $response->assertJson([
+            'component' => 'User/Edit',
+        ]);
+    }
+
+    public function test_it_will_instruct_inertia_to_reload_on_a_version_mismatch()
+    {
+        Inertia::version(1234);
+
+        $request = Request::create('/user/123', 'GET');
+        $request->headers->add(['X-Inertia' => 'true']);
+        $request->headers->add(['X-Inertia-Version' => 4321]);
+
+        $response = $this->makeMockResponse($request);
+
+        $response->assertStatus(409);
+        $response->assertHeader('X-Inertia-Location', $request->fullUrl());
+        self::assertEmpty($response->content());
+    }
+
+    private function makeMockResponse($request)
+    {
+        $response = (new Middleware())->handle($request, function ($request) {
+            return Inertia::render('User/Edit', ['user' => ['name' => 'Jonathan']])->toResponse($request);
+        });
+
+        return TestResponse::fromBaseResponse($response);
+    }
+}