diff --git a/.gitignore b/.gitignore
index 40b878d..9ba488b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-node_modules/
\ No newline at end of file
+*.DS_Store
+node_modules/
diff --git a/.travis.yml b/.travis.yml
index c08f018..52eeb85 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,8 @@
 language: node_js
 node_js:
-  - 0.12
   - 4
   - 6
   - 7
+  - 8
+  - 9
+
diff --git a/lib/tree.js b/lib/tree.js
index 22c0f8e..909c0db 100644
--- a/lib/tree.js
+++ b/lib/tree.js
@@ -23,17 +23,40 @@ var escodegenOptionDefaults = {
   }
 };
 
-function Tree(source, escodegenOptions, acornOptions) {
-  this.acornOptionDefaults = _.extend({}, acornOptionDefaults, acornOptions);
-  this.comments = [];
-  this.tokens = [];
-  this.acornOptionDefaults.onComment = this.comments;
-  this.acornOptionDefaults.onToken = this.tokens;
-  this.tree = acorn.parse(source.toString(), this.acornOptionDefaults);
-  this.tree = escodegen.attachComments(this.tree, this.comments, this.tokens);
-  this.body = new Body(this.tree.body, this.acornOptionDefaults);
-  this.escodegenOptions = _.extend({}, escodegenOptionDefaults, escodegenOptions);
-}
+var Tree = module.exports = function Tree() {
+  this.acornOptions = undefined;
+  this.comments = undefined;
+  this.tree = undefined;
+  this.body = undefined;
+  this.escodegenOptions = undefined;
+};
+
+Tree.fromSource = function(source, escodegenOptions, acornOptions) {
+  var instance = new Tree();
+  instance.acornOptions = _.extend({}, acornOptionDefaults, acornOptions);
+  instance.comments = [];
+  instance.tokens = [];
+  instance.acornOptions.onComment = instance.comments;
+  instance.acornOptions.onToken = instance.tokens;
+  instance.tree = acorn.parse(source.toString(), instance.acornOptions);
+  instance.tree = escodegen.attachComments(instance.tree, instance.comments, instance.tokens);
+  instance.body = new Body(instance.tree.body, instance.acornOptions);
+  instance.escodegenOptions = _.extend({}, escodegenOptionDefaults, escodegenOptions);
+  return instance;
+};
+
+Tree.fromTree = function(tree, escodegenOptions, acornOptions) {
+  var instance = new Tree();
+  instance.acornOptions = _.extend({}, acornOptionDefaults, acornOptions);
+  instance.comments = [];
+  instance.tokens = [];
+  instance.acornOptions.onComment = instance.comments;
+  instance.acornOptions.onToken = instance.tokens;
+  instance.tree = tree;
+  instance.body = new Body(instance.tree.body, instance.acornOptions);
+  instance.escodegenOptions = _.extend({}, escodegenOptionDefaults, escodegenOptions);
+  return instance;
+};
 
 /**
  * Return the regenerated code string
@@ -110,7 +133,3 @@ Tree.prototype.verbatim = function (body) {
   Body.verbatims[token] = body;
   return '\'' + token + '\';';
 };
-
-module.exports = function (source, escodegenOptions, acornOptions) {
-  return new Tree(source, escodegenOptions, acornOptions);
-};
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..e995a93
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1226 @@
+{
+  "name": "ast-query",
+  "version": "2.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "abbrev": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
+      "dev": true
+    },
+    "acorn": {
+      "version": "5.5.3",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.5.3.tgz",
+      "integrity": "sha512-jd5MkIUlbbmb07nXH0DT3y7rDVtkzDi4XZOUVWAer8ajmF/DTSSbl5oNFyDOl/OXA33Bl79+ypHhl2pN20VeOQ=="
+    },
+    "acorn-jsx": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-4.1.1.tgz",
+      "integrity": "sha512-JY+iV6r+cO21KtntVvFkD+iqjtdpRUpGqKWgfkCdZq1R+kbreEl8EcdcJR4SmiIgsIQT33s6QzheQ9a275Q8xw==",
+      "requires": {
+        "acorn": "5.5.3"
+      }
+    },
+    "amdefine": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
+      "optional": true
+    },
+    "ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "dev": true
+    },
+    "ansi-styles": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "dev": true
+    },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "1.0.3"
+      },
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+      "integrity": "sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E=",
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+      "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
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+      "integrity": "sha1-Q8NuXVaf+OSBbE76i+AtJpZ8GKo="
+    },
+    "once": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+      "dev": true,
+      "requires": {
+        "wrappy": "1.0.2"
+      }
+    },
+    "optionator": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.2.tgz",
+      "integrity": "sha1-NkxeQJ0/TWMB1sC0wFu6UBgK62Q=",
+      "requires": {
+        "deep-is": "0.1.3",
+        "fast-levenshtein": "2.0.6",
+        "levn": "0.3.0",
+        "prelude-ls": "1.1.2",
+        "type-check": "0.3.2",
+        "wordwrap": "1.0.0"
+      }
+    },
+    "parse-json": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-2.2.0.tgz",
+      "integrity": "sha1-9ID0BDTvgHQfhGkJn43qGPVaTck=",
+      "dev": true,
+      "requires": {
+        "error-ex": "1.3.1"
+      }
+    },
+    "path-exists": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-2.1.0.tgz",
+      "integrity": "sha1-D+tsZPD8UY2adU3V77YscCJ2H0s=",
+      "dev": true,
+      "requires": {
+        "pinkie-promise": "2.0.1"
+      }
+    },
+    "path-is-absolute": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
+      "dev": true
+    },
+    "path-type": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/path-type/-/path-type-1.1.0.tgz",
+      "integrity": "sha1-WcRPfuSR2nBNpBXaWkBwuk+P5EE=",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "4.1.11",
+        "pify": "2.3.0",
+        "pinkie-promise": "2.0.1"
+      }
+    },
+    "pify": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
+      "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
+      "dev": true
+    },
+    "pinkie": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/pinkie/-/pinkie-2.0.4.tgz",
+      "integrity": "sha1-clVrgM+g1IqXToDnckjoDtT3+HA=",
+      "dev": true
+    },
+    "pinkie-promise": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/pinkie-promise/-/pinkie-promise-2.0.1.tgz",
+      "integrity": "sha1-ITXW36ejWMBprJsXh3YogihFD/o=",
+      "dev": true,
+      "requires": {
+        "pinkie": "2.0.4"
+      }
+    },
+    "prelude-ls": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
+      "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ="
+    },
+    "read-pkg": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-1.1.0.tgz",
+      "integrity": "sha1-9f+qXs0pyzHAR0vKfXVra7KePyg=",
+      "dev": true,
+      "requires": {
+        "load-json-file": "1.1.0",
+        "normalize-package-data": "2.4.0",
+        "path-type": "1.1.0"
+      }
+    },
+    "read-pkg-up": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/read-pkg-up/-/read-pkg-up-1.0.1.tgz",
+      "integrity": "sha1-nWPBMnbAZZGNV/ACpX9AobZD+wI=",
+      "dev": true,
+      "requires": {
+        "find-up": "1.1.2",
+        "read-pkg": "1.1.0"
+      }
+    },
+    "readable-stream": {
+      "version": "1.1.14",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
+      "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
+      "dev": true,
+      "requires": {
+        "core-util-is": "1.0.2",
+        "inherits": "2.0.3",
+        "isarray": "0.0.1",
+        "string_decoder": "0.10.31"
+      }
+    },
+    "redent": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/redent/-/redent-1.0.0.tgz",
+      "integrity": "sha1-z5Fqsf1fHxbfsggi3W7H9zDCr94=",
+      "dev": true,
+      "requires": {
+        "indent-string": "2.1.0",
+        "strip-indent": "1.0.1"
+      }
+    },
+    "repeating": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/repeating/-/repeating-2.0.1.tgz",
+      "integrity": "sha1-UhTFOpJtNVJwdSf7q0FdvAjQbdo=",
+      "dev": true,
+      "requires": {
+        "is-finite": "1.0.2"
+      }
+    },
+    "resolve": {
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.1.7.tgz",
+      "integrity": "sha1-IDEU2CrSxe2ejgQRs5ModeiJ6Xs=",
+      "dev": true
+    },
+    "rimraf": {
+      "version": "2.2.8",
+      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.2.8.tgz",
+      "integrity": "sha1-5Dm+Kq7jJzIZUnMPmaiSnk/FBYI=",
+      "dev": true
+    },
+    "semver": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-5.5.0.tgz",
+      "integrity": "sha512-4SJ3dm0WAwWy/NVeioZh5AntkdJoWKxHxcmyP622fOkgHa4z3R0TdBJICINyaSDE6uNwVc8gZr+ZinwZAH4xIA==",
+      "dev": true
+    },
+    "shelljs": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/shelljs/-/shelljs-0.3.0.tgz",
+      "integrity": "sha1-NZbmMHp4FUT1kfN9phg2DzHbV7E=",
+      "dev": true
+    },
+    "signal-exit": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
+      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
+      "dev": true
+    },
+    "source-map": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.2.0.tgz",
+      "integrity": "sha1-2rc/vPwrqBm03gO9b26qSBZLP50=",
+      "optional": true,
+      "requires": {
+        "amdefine": "1.0.1"
+      }
+    },
+    "spdx-correct": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.0.0.tgz",
+      "integrity": "sha512-N19o9z5cEyc8yQQPukRCZ9EUmb4HUpnrmaL/fxS2pBo2jbfcFRVuFZ/oFC+vZz0MNNk0h80iMn5/S6qGZOL5+g==",
+      "dev": true,
+      "requires": {
+        "spdx-expression-parse": "3.0.0",
+        "spdx-license-ids": "3.0.0"
+      }
+    },
+    "spdx-exceptions": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.1.0.tgz",
+      "integrity": "sha512-4K1NsmrlCU1JJgUrtgEeTVyfx8VaYea9J9LvARxhbHtVtohPs/gFGG5yy49beySjlIMhhXZ4QqujIZEfS4l6Cg==",
+      "dev": true
+    },
+    "spdx-expression-parse": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-3.0.0.tgz",
+      "integrity": "sha512-Yg6D3XpRD4kkOmTpdgbUiEJFKghJH03fiC1OPll5h/0sO6neh2jqRDVHOQ4o/LMea0tgCkbMgea5ip/e+MkWyg==",
+      "dev": true,
+      "requires": {
+        "spdx-exceptions": "2.1.0",
+        "spdx-license-ids": "3.0.0"
+      }
+    },
+    "spdx-license-ids": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.0.tgz",
+      "integrity": "sha512-2+EPwgbnmOIl8HjGBXXMd9NAu02vLjOO1nWw4kmeRDFyHn+M/ETfHxQUK0oXg8ctgVnl9t3rosNVsZ1jG61nDA==",
+      "dev": true
+    },
+    "sprintf-js": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.1.1.tgz",
+      "integrity": "sha1-Nr54Mgr+WAH2zqPueLblqrlA6gw=",
+      "dev": true
+    },
+    "string_decoder": {
+      "version": "0.10.31",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+      "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
+      "dev": true
+    },
+    "strip-ansi": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+      "dev": true,
+      "requires": {
+        "ansi-regex": "2.1.1"
+      }
+    },
+    "strip-bom": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-2.0.0.tgz",
+      "integrity": "sha1-YhmoVhZSBJHzV4i9vxRHqZx+aw4=",
+      "dev": true,
+      "requires": {
+        "is-utf8": "0.2.1"
+      }
+    },
+    "strip-indent": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-1.0.1.tgz",
+      "integrity": "sha1-DHlipq3vp7vUrDZkYKY4VSrhoKI=",
+      "dev": true,
+      "requires": {
+        "get-stdin": "4.0.1"
+      }
+    },
+    "strip-json-comments": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-1.0.4.tgz",
+      "integrity": "sha1-HhX7ysl9Pumb8tc7TGVrCCu6+5E=",
+      "dev": true
+    },
+    "supports-color": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+      "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+      "dev": true
+    },
+    "traverse": {
+      "version": "0.6.6",
+      "resolved": "https://registry.npmjs.org/traverse/-/traverse-0.6.6.tgz",
+      "integrity": "sha1-y99WD9e5r2MlAv7UD5GMFX6pcTc="
+    },
+    "trim-newlines": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-1.0.0.tgz",
+      "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM=",
+      "dev": true
+    },
+    "type-check": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
+      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
+      "requires": {
+        "prelude-ls": "1.1.2"
+      }
+    },
+    "underscore.string": {
+      "version": "3.3.4",
+      "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.4.tgz",
+      "integrity": "sha1-LCo/n4PmR2L9xF5s6sZRQoZCE9s=",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "1.1.1",
+        "util-deprecate": "1.0.2"
+      }
+    },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
+    },
+    "validate-npm-package-license": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.3.tgz",
+      "integrity": "sha512-63ZOUnL4SIXj4L0NixR3L1lcjO38crAbgrTpl28t8jjrfuiOBL5Iygm+60qPs/KsZGzPNg6Smnc/oY16QTjF0g==",
+      "dev": true,
+      "requires": {
+        "spdx-correct": "3.0.0",
+        "spdx-expression-parse": "3.0.0"
+      }
+    },
+    "which": {
+      "version": "1.2.14",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.2.14.tgz",
+      "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU=",
+      "dev": true,
+      "requires": {
+        "isexe": "2.0.0"
+      }
+    },
+    "wordwrap": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus="
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    }
+  }
+}
diff --git a/test/nodes/ArrayExpression.js b/test/nodes/ArrayExpression.js
index 4356748..bcc04b6 100644
--- a/test/nodes/ArrayExpression.js
+++ b/test/nodes/ArrayExpression.js
@@ -1,11 +1,20 @@
 var assert = require('assert');
-var program = require('../../');
 var valueFactory = require('../../lib/factory/value.js');
 
 var ObjectExpression = require('../../lib/nodes/ObjectExpression.js');
 var ArrayExpression = require('../../lib/nodes/ArrayExpression.js');
 var Literal = require('../../lib/nodes/Literal.js');
 
+var Tree = require('../..');
+
+[
+  Tree.fromSource,
+  function() {
+    var tree = Tree.fromSource(arguments[0], arguments[1], arguments[2], arguments[3], arguments[4]);
+    return Tree.fromTree(tree.tree, arguments[1], arguments[2], arguments[3], arguments[4]);
+  },
+].forEach(function(program) {
+
 describe('ArrayExpression objects', function () {
   beforeEach(function () {
     this.arr = new ArrayExpression(valueFactory.create('[1, [2, 3], "a", {"foo":"bar"}, ]'));
@@ -65,3 +74,5 @@ describe('ArrayExpression objects', function () {
     });
   });
 });
+
+});
diff --git a/test/nodes/AssignmentExpression.js b/test/nodes/AssignmentExpression.js
index 3a1f5ed..f247e01 100644
--- a/test/nodes/AssignmentExpression.js
+++ b/test/nodes/AssignmentExpression.js
@@ -1,9 +1,18 @@
 /*globals describe, it, beforeEach */
 var assert = require('assert');
-var program = require('../..');
 
 var AssignmentExpression = require('../../lib/nodes/AssignmentExpression.js');
 
+var Tree = require('../..');
+
+[
+  Tree.fromSource,
+  function() {
+    var tree = Tree.fromSource(arguments[0], arguments[1], arguments[2], arguments[3], arguments[4]);
+    return Tree.fromTree(tree.tree, arguments[1], arguments[2], arguments[3], arguments[4]);
+  },
+].forEach(function(program) {
+
 describe('AssignmentExpression objects', function () {
   beforeEach(function () {
     this.tree1 = program('a = 1;');
@@ -35,3 +44,5 @@ describe('AssignmentExpression objects', function () {
     });
   });
 });
+
+});
diff --git a/test/nodes/FunctionExpression.js b/test/nodes/FunctionExpression.js
index c9416f5..5dd8dc5 100644
--- a/test/nodes/FunctionExpression.js
+++ b/test/nodes/FunctionExpression.js
@@ -1,10 +1,19 @@
 /*globals describe, it, beforeEach */
 var assert = require('assert');
-var program = require('../..');
 var valueFactory = require('../../lib/factory/value.js');
 
 var FunctionExpression = require('../../lib/nodes/FunctionExpression.js');
 
+var Tree = require('../..');
+
+[
+  Tree.fromSource,
+  function() {
+    var tree = Tree.fromSource(arguments[0], arguments[1], arguments[2], arguments[3], arguments[4]);
+    return Tree.fromTree(tree.tree, arguments[1], arguments[2], arguments[3], arguments[4]);
+  },
+].forEach(function(program) {
+
 describe('FunctionExpression objects', function () {
   beforeEach(function () {
     this.func = program('var a = function () { "use strict"; }');
@@ -58,3 +67,5 @@ describe('FunctionExpression objects', function () {
     });
   });
 });
+
+});
\ No newline at end of file
diff --git a/test/nodes/Literal.js b/test/nodes/Literal.js
index 1011904..9673234 100644
--- a/test/nodes/Literal.js
+++ b/test/nodes/Literal.js
@@ -1,9 +1,18 @@
 var assert = require('assert');
-var program = require('../../');
 var valueFactory = require('../../lib/factory/value.js');
 
 var Literal = require('../../lib/nodes/Literal.js');
 
+var Tree = require('../..');
+
+[
+  Tree.fromSource,
+  function() {
+    var tree = Tree.fromSource(arguments[0], arguments[1], arguments[2], arguments[3], arguments[4]);
+    return Tree.fromTree(tree.tree, arguments[1], arguments[2], arguments[3], arguments[4]);
+  },
+].forEach(function(program) {
+
 describe('Literal nodes', function () {
   beforeEach(function () {
     this.tree = program('var a = 2;');
@@ -17,3 +26,5 @@ describe('Literal nodes', function () {
     });
   });
 });
+
+});
diff --git a/test/nodes/ObjectExpression.js b/test/nodes/ObjectExpression.js
index f07310c..7af3e57 100644
--- a/test/nodes/ObjectExpression.js
+++ b/test/nodes/ObjectExpression.js
@@ -1,10 +1,19 @@
 var assert = require('assert');
-var program = require('../../');
 var valueFactory = require('../../lib/factory/value.js');
 
 var ObjectExpression = require('../../lib/nodes/ObjectExpression.js');
 var Literal = require('../../lib/nodes/Literal.js');
 
+var Tree = require('../..');
+
+[
+  Tree.fromSource,
+  function() {
+    var tree = Tree.fromSource(arguments[0], arguments[1], arguments[2], arguments[3], arguments[4]);
+    return Tree.fromTree(tree.tree, arguments[1], arguments[2], arguments[3], arguments[4]);
+  },
+].forEach(function(program) {
+
 describe('ObjectExpression objects', function () {
   beforeEach(function () {
     this.obj = new ObjectExpression(valueFactory.create('{ a: "b", foo: 1, bar: { sub: 1 }, "special-key":"foo" }'));
@@ -55,3 +64,5 @@ describe('ObjectExpression objects', function () {
     });
   });
 });
+
+});
diff --git a/test/nodes/callexpression.js b/test/nodes/callexpression.js
index ede0935..70dede7 100644
--- a/test/nodes/callexpression.js
+++ b/test/nodes/callexpression.js
@@ -1,10 +1,19 @@
 /*globals describe, it, beforeEach */
 var assert = require('assert');
-var program = require('../..');
 
 var ObjectExpression = require('../../lib/nodes/ObjectExpression.js');
 var Literal = require('../../lib/nodes/Literal.js');
 
+var Tree = require('../..');
+
+[
+  Tree.fromSource,
+  function() {
+    var tree = Tree.fromSource(arguments[0], arguments[1], arguments[2], arguments[3], arguments[4]);
+    return Tree.fromTree(tree.tree, arguments[1], arguments[2], arguments[3], arguments[4]);
+  },
+].forEach(function(program) {
+
 describe('CallExpression objects', function () {
   beforeEach(function () {
     this.tree1 = program('foo(1);');
@@ -93,3 +102,5 @@ describe('CallExpression objects', function () {
     });
   });
 });
+
+});
diff --git a/test/nodes/variable.js b/test/nodes/variable.js
index 687a2fb..c4ddfda 100644
--- a/test/nodes/variable.js
+++ b/test/nodes/variable.js
@@ -1,10 +1,19 @@
 /*globals describe, it, beforeEach */
 var assert = require('assert');
-var program = require('../..');
 
 var ObjectExpression = require('../../lib/nodes/ObjectExpression.js');
 var Literal = require('../../lib/nodes/Literal.js');
 
+var Tree = require('../..');
+
+[
+  Tree.fromSource,
+  function() {
+    var tree = Tree.fromSource(arguments[0], arguments[1], arguments[2], arguments[3], arguments[4]);
+    return Tree.fromTree(tree.tree, arguments[1], arguments[2], arguments[3], arguments[4]);
+  },
+].forEach(function(program) {
+
 describe('Variable objects', function () {
   beforeEach(function () {
     this.tree1 = program('var a = 1;');
@@ -72,3 +81,5 @@ describe('Variable objects', function () {
   });
 
 });
+
+});
diff --git a/test/tree.js b/test/tree.js
index 086e245..783c0be 100644
--- a/test/tree.js
+++ b/test/tree.js
@@ -1,7 +1,16 @@
 var assert = require('assert');
-var program = require('..');
+var Tree = require('..');
 var Body = require('../lib/nodes/Body');
 
+
+[
+  Tree.fromSource,
+  function() {
+    var tree = Tree.fromSource(arguments[0], arguments[1], arguments[2], arguments[3], arguments[4]);
+    return Tree.fromTree(tree.tree, arguments[1], arguments[2], arguments[3], arguments[4]);
+  },
+].forEach(function(program) {
+
 describe('Tree', function () {
   describe('#toString()', function () {
     it('return the generated source code', function () {
@@ -127,5 +136,6 @@ describe('Tree', function () {
       assert.equal(tree.toString(), 'ANYTHING;\nvar a = 1;');
     });
   });
+});
 
 });