test(cli): add end-to-end integration tests for CLI commands

Add 23 integration tests using assert_cmd and predicates covering
about, validate, show, licenses, install, config, init, and
dump-autoload commands with shared test helpers and fixture projects.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

3 files changed, 124 insertions, 0 deletions

diff --git a/crates/mozart/tests/fixtures/with_dev_deps/composer.json b/crates/mozart/tests/fixtures/with_dev_deps/composer.json
new file mode 100644
index 0000000..09126f2
--- /dev/null
+++ b/crates/mozart/tests/fixtures/with_dev_deps/composer.json
@@ -0,0 +1,12 @@
+{
+    "name": "test/dev-project",
+    "description": "A project with dev dependencies",
+    "license": "MIT",
+    "require": {
+        "php": ">=8.1",
+        "psr/log": "^3.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^11.0"
+    }
+}
diff --git a/crates/mozart/tests/fixtures/with_dev_deps/composer.lock b/crates/mozart/tests/fixtures/with_dev_deps/composer.lock
new file mode 100644
index 0000000..d01e341
--- /dev/null
+++ b/crates/mozart/tests/fixtures/with_dev_deps/composer.lock
@@ -0,0 +1,80 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "ed17fac2f30232d69c31587151006a2f",
+    "packages": [
+        {
+            "name": "psr/log",
+            "version": "3.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/log.git",
+                "reference": "f16e1d5863e37f8d8c2a01719f5b34baa2b714d3"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/log/zipball/f16e1d5863e37f8d8c2a01719f5b34baa2b714d3",
+                "reference": "f16e1d5863e37f8d8c2a01719f5b34baa2b714d3",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.0.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Log\\": "src"
+                }
+            },
+            "license": [
+                "MIT"
+            ],
+            "description": "Common interface for logging libraries",
+            "time": "2024-09-11T13:17:53+00:00"
+        }
+    ],
+    "packages-dev": [
+        {
+            "name": "phpunit/phpunit",
+            "version": "11.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/phpunit.git",
+                "reference": "fake000000000000000000000000000000000001"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://fake.example.com/phpunit-11.0.0.zip",
+                "reference": "fake000000000000000000000000000000000001",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "PHPUnit\\": "src/"
+                }
+            },
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "description": "The PHP Unit Testing framework",
+            "time": "2024-02-02T06:38:00+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": {},
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": ">=8.1"
+    },
+    "platform-dev": {},
+    "plugin-api-version": "2.6.0"
+}
diff --git a/crates/mozart/tests/fixtures/with_dev_deps/vendor/composer/installed.json b/crates/mozart/tests/fixtures/with_dev_deps/vendor/composer/installed.json
new file mode 100644
index 0000000..efa3905
--- /dev/null
+++ b/crates/mozart/tests/fixtures/with_dev_deps/vendor/composer/installed.json
@@ -0,0 +1,32 @@
+{
+    "packages": [
+        {
+            "name": "phpunit/phpunit",
+            "version": "11.0.0",
+            "version_normalized": "11.0.0.0",
+            "type": "library",
+            "install-path": "../phpunit/phpunit",
+            "autoload": {
+                "psr-4": {
+                    "PHPUnit\\": "src/"
+                }
+            }
+        },
+        {
+            "name": "psr/log",
+            "version": "3.0.2",
+            "version_normalized": "3.0.2.0",
+            "type": "library",
+            "install-path": "../psr/log",
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Log\\": "src"
+                }
+            }
+        }
+    ],
+    "dev-package-names": [
+        "phpunit/phpunit"
+    ],
+    "dev": true
+}