Created middleware to keep backwards compatibility on errors when using v1 and 2 of the API

module/Rest/test/Middleware/ErrorHandler/BackwardsCompatibleProblemDetailsHandlerTest.php

@@ -0,0 +1,76 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ShlinkioTest\Shlink\Rest\Middleware\ErrorHandler;
+
+use Laminas\Diactoros\ServerRequestFactory;
+use PHPUnit\Framework\TestCase;
+use Prophecy\PhpUnit\ProphecyTrait;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Shlinkio\Shlink\Core\Exception\ValidationException;
+use Shlinkio\Shlink\Rest\Exception\BackwardsCompatibleProblemDetailsException;
+use Shlinkio\Shlink\Rest\Middleware\ErrorHandler\BackwardsCompatibleProblemDetailsHandler;
+use Throwable;
+
+class BackwardsCompatibleProblemDetailsHandlerTest extends TestCase
+{
+    use ProphecyTrait;
+
+    private BackwardsCompatibleProblemDetailsHandler $handler;
+
+    protected function setUp(): void
+    {
+        $this->handler = new BackwardsCompatibleProblemDetailsHandler();
+    }
+
+    /**
+     * @test
+     * @dataProvider provideExceptions
+     */
+    public function expectedExceptionIsThrownBasedOnTheRequestVersion(
+        ServerRequestInterface $request,
+        Throwable $thrownException,
+        string $expectedException,
+    ): void {
+        $handler = $this->prophesize(RequestHandlerInterface::class);
+        $handle = $handler->handle($request)->willThrow($thrownException);
+
+        $this->expectException($expectedException);
+        $handle->shouldBeCalledOnce();
+
+        $this->handler->process($request, $handler->reveal());
+    }
+
+    public function provideExceptions(): iterable
+    {
+        $baseRequest = ServerRequestFactory::fromGlobals();
+
+        yield 'no version' => [
+            $baseRequest,
+            ValidationException::fromArray([]),
+            BackwardsCompatibleProblemDetailsException::class,
+        ];
+        yield 'version 1' => [
+            $baseRequest->withAttribute('version', '1'),
+            ValidationException::fromArray([]),
+            BackwardsCompatibleProblemDetailsException::class,
+        ];
+        yield 'version 2' => [
+            $baseRequest->withAttribute('version', '2'),
+            ValidationException::fromArray([]),
+            BackwardsCompatibleProblemDetailsException::class,
+        ];
+        yield 'version 3' => [
+            $baseRequest->withAttribute('version', '3'),
+            ValidationException::fromArray([]),
+            ValidationException::class,
+        ];
+        yield 'version 4' => [
+            $baseRequest->withAttribute('version', '3'),
+            ValidationException::fromArray([]),
+            ValidationException::class,
+        ];
+    }
+}