diff --git a/samples/JSON/composer.lock b/samples/JSON/composer.lock
new file mode 100644
index 00000000..09323450
--- /dev/null
+++ b/samples/JSON/composer.lock
@@ -0,0 +1,267 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file"
+    ],
+    "hash": "d8ff8fcb71824f5199f3499bf71862f1",
+    "packages": [
+        {
+            "name": "arbit/system-process",
+            "version": "1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/Arbitracker/system-process.git",
+                "reference": "1.0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/Arbitracker/system-process/zipball/1.0",
+                "reference": "1.0",
+                "shasum": ""
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "SystemProcess": "src/main/php/"
+                }
+            },
+            "notification-url": "http://packagist.org/downloads/",
+            "description": "System process execution library",
+            "time": "2013-03-31 12:42:56"
+        },
+        {
+            "name": "pdepend/staticReflection",
+            "version": "0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/manuelpichler/staticReflection.git",
+                "reference": "origin/master"
+            },
+            "type": "library"
+        },
+        {
+            "name": "qafoo/rmf",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/Qafoo/REST-Micro-Framework.git",
+                "reference": "5f43983f15a8aa12be42ad6068675d4008bfb9ed"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/Qafoo/REST-Micro-Framework/zipball/5f43983f15a8aa12be42ad6068675d4008bfb9ed",
+                "reference": "5f43983f15a8aa12be42ad6068675d4008bfb9ed",
+                "shasum": ""
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "Qafoo\\RMF": "src/main/"
+                }
+            },
+            "description": "Very simple VC framework which makes it easy to build HTTP applications / REST webservices",
+            "support": {
+                "source": "https://github.com/Qafoo/REST-Micro-Framework/tree/master",
+                "issues": "https://github.com/Qafoo/REST-Micro-Framework/issues"
+            },
+            "time": "2012-12-07 13:33:01"
+        },
+        {
+            "name": "twig/twig",
+            "version": "1.6.0",
+            "source": {
+                "type": "git",
+                "url": "git://github.com/fabpot/Twig.git",
+                "reference": "v1.6.0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://github.com/fabpot/Twig/zipball/v1.6.0",
+                "reference": "v1.6.0",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.2.4"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "Twig_": "lib/"
+                }
+            },
+            "license": [
+                "BSD"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Armin Ronacher",
+                    "email": "armin.ronacher@active-4.com"
+                }
+            ],
+            "description": "Twig, the flexible, fast, and secure template language for PHP",
+            "homepage": "http://twig.sensiolabs.org",
+            "keywords": [
+                "templating"
+            ],
+            "time": "2012-02-03 23:34:52"
+        },
+        {
+            "name": "twitter/bootstrap",
+            "version": "0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/twitter/bootstrap/",
+                "reference": "origin/master"
+            },
+            "type": "library"
+        },
+        {
+            "name": "zetacomponents/base",
+            "version": "1.8",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/zetacomponents/Base.git",
+                "reference": "1.8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://github.com/zetacomponents/Base/zipball/1.8",
+                "reference": "1.8",
+                "shasum": ""
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src"
+                ]
+            },
+            "license": [
+                "apache2"
+            ],
+            "authors": [
+                {
+                    "name": "Sergey Alexeev"
+                },
+                {
+                    "name": "Sebastian Bergmann"
+                },
+                {
+                    "name": "Jan Borsodi"
+                },
+                {
+                    "name": "Raymond Bosman"
+                },
+                {
+                    "name": "Frederik Holljen"
+                },
+                {
+                    "name": "Kore Nordmann"
+                },
+                {
+                    "name": "Derick Rethans"
+                },
+                {
+                    "name": "Vadym Savchuk"
+                },
+                {
+                    "name": "Tobias Schlitt"
+                },
+                {
+                    "name": "Alexandru Stanoi"
+                }
+            ],
+            "description": "The Base package provides the basic infrastructure that all packages rely on. Therefore every component relies on this package.",
+            "homepage": "https://github.com/zetacomponents",
+            "time": "2009-12-21 04:14:16"
+        },
+        {
+            "name": "zetacomponents/graph",
+            "version": "1.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/zetacomponents/Graph.git",
+                "reference": "1.5"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://github.com/zetacomponents/Graph/zipball/1.5",
+                "reference": "1.5",
+                "shasum": ""
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src"
+                ]
+            },
+            "license": [
+                "apache2"
+            ],
+            "authors": [
+                {
+                    "name": "Sergey Alexeev"
+                },
+                {
+                    "name": "Sebastian Bergmann"
+                },
+                {
+                    "name": "Jan Borsodi"
+                },
+                {
+                    "name": "Raymond Bosman"
+                },
+                {
+                    "name": "Frederik Holljen"
+                },
+                {
+                    "name": "Kore Nordmann"
+                },
+                {
+                    "name": "Derick Rethans"
+                },
+                {
+                    "name": "Vadym Savchuk"
+                },
+                {
+                    "name": "Tobias Schlitt"
+                },
+                {
+                    "name": "Alexandru Stanoi"
+                },
+                {
+                    "name": "Lars Jankowski"
+                },
+                {
+                    "name": "Elger Thiele"
+                },
+                {
+                    "name": "Michael Maclean"
+                }
+            ],
+            "description": "A component for creating pie charts, line graphs and other kinds of diagrams.",
+            "homepage": "https://github.com/zetacomponents",
+            "time": "2009-12-21 04:26:17"
+        }
+    ],
+    "packages-dev": [
+
+    ],
+    "aliases": [
+
+    ],
+    "minimum-stability": "stable",
+    "stability-flags": {
+        "qafoo/rmf": 20,
+        "arbit/system-process": 0
+    },
+    "platform": [
+
+    ],
+    "platform-dev": [
+
+    ]
+}
diff --git a/test/test_blob.rb b/test/test_blob.rb
index 252de56d..0df35795 100644
--- a/test/test_blob.rb
+++ b/test/test_blob.rb
@@ -179,6 +179,9 @@ class TestBlob < Test::Unit::TestCase
     # TypeScript-generated JS
     # TODO
 
+    # Composer generated composer.lock file
+    assert blob("JSON/composer.lock").generated?
+
     # PEG.js-generated parsers
     assert blob("JavaScript/parser.js").generated?