test(plugin): compare plugin-provided command execution against upstream

A Shirabe-authored CommandProvider fixture plugin (greet) runs under both
implementations: exit codes, the command's own output, help/list rendering,
alias resolution, a validation failure, and a file recording the shared
object graph the command observed (root package, strict application FQCN,
and the exit code of the built-in about command it invoked) must match.

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

1 files changed, 24 insertions, 0 deletions

diff --git a/crates/shirabe/tests/plugin/fixtures/e2e-command/project/composer.json b/crates/shirabe/tests/plugin/fixtures/e2e-command/project/composer.json
new file mode 100644
index 00000000..e68a53de
--- /dev/null
+++ b/crates/shirabe/tests/plugin/fixtures/e2e-command/project/composer.json
@@ -0,0 +1,24 @@
+{
+    "name": "shirabe/e2e-command-provider",
+    "description": "E2E fixture project: run a plugin-provided command against upstream Composer and Shirabe.",
+    "repositories": [
+        {
+            "type": "path",
+            "url": "../plugin",
+            "options": {
+                "symlink": false
+            }
+        },
+        {
+            "packagist.org": false
+        }
+    ],
+    "require": {
+        "shirabe-test/command-provider": "1.0.0"
+    },
+    "config": {
+        "allow-plugins": {
+            "shirabe-test/command-provider": true
+        }
+    }
+}