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node_modules/should/lib/ext/assert.js

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+/*!
+ * Should
+ * Copyright(c) 2010-2014 TJ Holowaychuk <tj@vision-media.ca>
+ * MIT Licensed
+ */
+
+var util = require('../util')
+  , assert = require('assert')
+  , AssertionError = assert.AssertionError;
+
+module.exports = function(should) {
+  var i = should.format;
+
+  /**
+   * Expose assert to should
+   *
+   * This allows you to do things like below
+   * without require()ing the assert module.
+   *
+   *    should.equal(foo.bar, undefined);
+   *
+   */
+  util.merge(should, assert);
+
+
+  /**
+   * Assert _obj_ exists, with optional message.
+   *
+   * @param {*} obj
+   * @param {String} [msg]
+   * @api public
+   */
+  should.exist = should.exists = function(obj, msg) {
+    if(null == obj) {
+      throw new AssertionError({
+        message: msg || ('expected ' + i(obj) + ' to exist'), stackStartFunction: should.exist
+      });
+    }
+  };
+
+  /**
+   * Asserts _obj_ does not exist, with optional message.
+   *
+   * @param {*} obj
+   * @param {String} [msg]
+   * @api public
+   */
+
+  should.not = {};
+  should.not.exist = should.not.exists = function(obj, msg) {
+    if(null != obj) {
+      throw new AssertionError({
+        message: msg || ('expected ' + i(obj) + ' to not exist'), stackStartFunction: should.not.exist
+      });
+    }
+  };
+};