Add e2e test

.github/workflows/e2e-tests.yml

@@ -233,6 +233,15 @@ jobs:
               cd e2e/bug-11857
               composer install
               ../../bin/phpstan
+          - script: |
+              cd e2e/result-cache-meta-extension
+              ../../bin/phpstan -vvv
+              ../../bin/phpstan -vvv --fail-without-result-cache
+              echo 'modified-hash' > hash.txt
+              OUTPUT=$(../bashunit -a exit_code "2" "../../bin/phpstan -vvv --fail-without-result-cache")
+              echo "$OUTPUT"
+              ../bashunit -a matches "Note: Using configuration file .+phpstan.neon." "$OUTPUT"
+              ../bashunit -a contains 'Result cache not used because the metadata do not match: metaExtensions' "$OUTPUT"
 
     steps:
       - name: "Checkout"

composer.json

@@ -140,6 +140,9 @@
 		"classmap": [
 			"tests/e2e",
 			"tests/PHPStan"
+		],
+		"files": [
+			"e2e/result-cache-meta-extension/src/DummyResultCacheMetaExtension.php"
 		]
 	},
 	"repositories": [

e2e/result-cache-meta-extension/hash.txt

@@ -0,0 +1 @@
+initial-hash

e2e/result-cache-meta-extension/phpstan.neon

@@ -0,0 +1,10 @@
+parameters:
+	level: 8
+	paths:
+		- src
+
+services:
+	-
+		class: ResultCacheE2E\MetaExtension\DummyResultCacheMetaExtension
+		tags:
+			- phpstan.resultCacheMetaExtension

e2e/result-cache-meta-extension/src/DummyResultCacheMetaExtension.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ResultCacheE2E\MetaExtension;
+
+use PHPStan\Analyser\ResultCache\ResultCacheMetaExtension;
+
+final class DummyResultCacheMetaExtension implements ResultCacheMetaExtension
+{
+	public function getKey(): string
+	{
+		return 'e2e-self-hashing-result-cache-meta-extension';
+	}
+
+	public function getHash(): string
+	{
+		// @phpstan-ignore argument.type (the file is always present so this won't pass `false` as an argument)
+		return trim(file_get_contents(__DIR__ . '/../hash.txt'));
+	}
+}