test(plugin): compare a real-plugin install against upstream Composer

Run upstream Composer and Shirabe over pristine copies of a fixture
project at the same path and require composer.lock, the whole vendor tree
(including the plugin-generated GeneratedConfig.php), the plugin's IO
lines and the exit code to match byte for byte.

The plugin under test (phpstan/extension-installer 1.4.3) is downloaded by
fixtures/e2e/fetch — pinned to an upstream commit and hash-verified — into
a git-ignored directory rather than committed; the test skips while it is
absent, like the other real-PHP prerequisites. Its dependencies are
minimal stand-ins resolved from local repositories, so test runs stay
offline. A zip dist would exercise the known lossy-string byte-precision
debt in RemoteFilesystem, so the fixture serves the plugin through a path
dist until that is resolved.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

1 files changed, 71 insertions, 0 deletions

diff --git a/crates/shirabe/tests/plugin/fixtures/e2e/project/composer.json b/crates/shirabe/tests/plugin/fixtures/e2e/project/composer.json
new file mode 100644
index 00000000..d16b5383
--- /dev/null
+++ b/crates/shirabe/tests/plugin/fixtures/e2e/project/composer.json
@@ -0,0 +1,71 @@
+{
+    "name": "shirabe/e2e-extension-installer",
+    "description": "E2E fixture project: install phpstan/extension-installer and let it generate its config.",
+    "repositories": [
+        {
+            "type": "package",
+            "package": {
+                "name": "phpstan/extension-installer",
+                "version": "1.4.3",
+                "type": "composer-plugin",
+                "license": [
+                    "MIT"
+                ],
+                "autoload": {
+                    "psr-4": {
+                        "PHPStan\\ExtensionInstaller\\": "src/"
+                    }
+                },
+                "require": {
+                    "php": "^7.2 || ^8.0",
+                    "composer-plugin-api": "^2.0",
+                    "phpstan/phpstan": "^1.9.0 || ^2.0"
+                },
+                "extra": {
+                    "class": "PHPStan\\ExtensionInstaller\\Plugin"
+                },
+                "dist": {
+                    "type": "path",
+                    "url": "../ext/phpstan-extension-installer-1.4.3"
+                },
+                "transport-options": {
+                    "symlink": false
+                }
+            }
+        },
+        {
+            "type": "path",
+            "url": "../packages/phpstan-phpstan",
+            "options": {
+                "symlink": false
+            }
+        },
+        {
+            "type": "path",
+            "url": "../packages/acme-extension",
+            "options": {
+                "symlink": false
+            }
+        },
+        {
+            "type": "path",
+            "url": "../packages/acme-phpstan-tools",
+            "options": {
+                "symlink": false
+            }
+        },
+        {
+            "packagist.org": false
+        }
+    ],
+    "require": {
+        "phpstan/extension-installer": "1.4.3",
+        "acme/extension": "1.0.0",
+        "acme/phpstan-tools": "1.0.0"
+    },
+    "config": {
+        "allow-plugins": {
+            "phpstan/extension-installer": true
+        }
+    }
+}