From f1ea4989276a4f715bb41a38136f73d81966d098 Mon Sep 17 00:00:00 2001
From: josdejong <wjosdejong@gmail.com>
Date: Sat, 15 Mar 2014 15:27:05 +0100
Subject: [PATCH] Added some more unit tests

---
 bin/cli.js                               |   2 +-
 docs/functions.md                        |   1 +
 docs/{extend.md => import.md}            |  22 ++++-
 docs/index.md                            |   2 +-
 examples/import.js                       |  16 ++-
 lib/chaining/Selector.js                 |   3 +-
 lib/function/utils/import.js             |  26 +++--
 lib/function/utils/typeof.js             |   2 +-
 lib/type/Complex.js                      |   3 +-
 lib/type/Help.js                         |   8 +-
 lib/type/Index.js                        |   3 +-
 lib/type/Matrix.js                       |   2 +-
 lib/type/Range.js                        |   3 +-
 lib/type/Unit.js                         |   2 +-
 lib/util/object.js                       |   8 +-
 test/function/probability/random.test.js |  12 +--
 test/function/utils/clone.test.js        |   6 ++
 test/function/utils/format.test.js       |   6 ++
 test/function/utils/import.test.js       |  32 ++++++
 test/function/utils/print.test.js        |  24 ++++-
 test/function/utils/typeof.test.js       |  32 +++++-
 test/type/Help.test.js                   | 121 ++++++++++++++++++++++-
 test/util/number.test.js                 |   2 +-
 23 files changed, 289 insertions(+), 49 deletions(-)
 rename docs/{extend.md => import.md} (68%)

diff --git a/bin/cli.js b/bin/cli.js
index e5d2a0aef..888d7e0fd 100644
--- a/bin/cli.js
+++ b/bin/cli.js
@@ -44,7 +44,7 @@ var mathjs = require('../index'),
     parser = math.parser(),
     fs = require('fs');
 
-var PRECISION = 14; // digits
+var PRECISION = 14; // decimals
 
 /**
  * auto complete a text
diff --git a/docs/functions.md b/docs/functions.md
index 0eb78d88f..439c9734e 100644
--- a/docs/functions.md
+++ b/docs/functions.md
@@ -137,6 +137,7 @@ math.add('hello ', 'world!');     // String  'hello world!'
 - math.clone(x)
 - math.forEach(x, callback)
 - math.format(value [, precision])
+- math.ifElse(conditionalExpr, trueExpr, falseExpr)
 - math.import(filename | object, override)
 - math.map(x, callback)
 - math.print(template, values [, precision])
diff --git a/docs/extend.md b/docs/import.md
similarity index 68%
rename from docs/extend.md
rename to docs/import.md
index f8c5a0aa9..fef6f55e9 100644
--- a/docs/extend.md
+++ b/docs/import.md
@@ -1,9 +1,29 @@
-# Extend
+# Import
 
 The library can easily be extended with functions and variables using the
 `import` function. The function `import` accepts a filename or an object with
 functions and variables.
 
+Function `import` has the following syntax:
+
+```js
+    math.import(object: Object [, options: Object])
+    math.import(moduleName: String [, options: Object])
+```
+
+The first argument can be a module name or an object. The optional second
+argument can be an object with options. The following options are available:
+
+- `{Boolean} override`
+  If true, existing functions will be overwritten. False by default.
+- `{Boolean} wrap`
+  If true (default), the functions will be wrapped in a wrapper function which
+  converts data types like Matrix to primitive data types like Array.
+  The wrapper is needed when extending math.js with libraries which do not
+  support the math.js data types.
+
+Math.js can be extended with functions and variables:
+
 ```js
 // create an instance of math.js
 var math = require('mathjs')();
diff --git a/docs/index.md b/docs/index.md
index d2d9ec064..5460b93cc 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -11,6 +11,6 @@
   - [Complex Numbers](datatypes/complex_numbers.md)
   - [Matrices](datatypes/matrices.md)
   - [Units](datatypes/units.md)
-- [Extension](extend.md)
+- [Import](import.md)
 - [Configuration](configuration.md)
 - [Command Line Interface](command_line_interface.md)
diff --git a/examples/import.js b/examples/import.js
index 65b1d751c..a76b66af9 100644
--- a/examples/import.js
+++ b/examples/import.js
@@ -1,7 +1,7 @@
 /**
  * Math.js can easily be extended with functions and variables using the
- * `import` function. The function `import` accepts a filename or an object
- * with functions and variables.
+ * `import` function. The function `import` accepts a module name or an object
+ * containing functions and variables.
  */
 
 // load math.js and create an instance
@@ -78,3 +78,15 @@ if (math.eig) {
   var b = [9, 8, 3];
   print(math.solve(A, b)); // [2, -1, 3]
 }
+
+/**
+ * By default, the function import does not allow overriding existing functions.
+ * Existing functions can be overridden by specifying option `override=true`
+ */
+math.import({
+  pi: 3.14
+}, {
+  override: true
+});
+
+print(math.pi); // returns 3.14 instead of 3.141592653589793
diff --git a/lib/chaining/Selector.js b/lib/chaining/Selector.js
index 9c77cdd09..d8127849d 100644
--- a/lib/chaining/Selector.js
+++ b/lib/chaining/Selector.js
@@ -21,8 +21,7 @@ module.exports = function (math) {
    */
   function Selector (value) {
     if (!(this instanceof Selector)) {
-      throw new SyntaxError(
-          'Selector constructor must be called with the new operator');
+      throw new SyntaxError('Constructor must be called with the new operator');
     }
 
     if (value instanceof Selector) {
diff --git a/lib/function/utils/import.js b/lib/function/utils/import.js
index 20b4a6532..c5ba5bdb0 100644
--- a/lib/function/utils/import.js
+++ b/lib/function/utils/import.js
@@ -10,8 +10,8 @@ module.exports = function (math) {
       isUnit = Unit.isUnit;
 
   /**
-   * Import functions from an object or a file
-   * @param {function | String | Object} object
+   * Import functions from an object or a module
+   * @param {String | Object} object
    * @param {Object} [options]        Available options:
    *                                  {Boolean} override
    *                                      If true, existing functions will be
@@ -27,6 +27,11 @@ module.exports = function (math) {
    */
 // TODO: return status information
   math['import'] = function math_import(object, options) {
+    var num = arguments.length;
+    if (num != 1 && num != 2) {
+      throw new math.error.ArgumentsError('import', num, 1, 2);
+    }
+
     var name;
     var opts = {
       override: false,
@@ -47,19 +52,7 @@ module.exports = function (math) {
         throw new Error('Cannot load file: require not available.');
       }
     }
-    else if (isSupportedType(object)) {
-      // a single function
-      name = object.name;
-      if (name) {
-        if (opts.override || math[name] === undefined) {
-          _import(name, object, opts);
-        }
-      }
-      else {
-        throw new Error('Cannot import an unnamed function or object');
-      }
-    }
-    else if (object instanceof Object) {
+    else if (typeof object === 'object') {
       // a map with functions
       for (name in object) {
         if (object.hasOwnProperty(name)) {
@@ -73,6 +66,9 @@ module.exports = function (math) {
         }
       }
     }
+    else {
+      throw new TypeError('Object or module name expected');
+    }
   };
 
   /**
diff --git a/lib/function/utils/typeof.js b/lib/function/utils/typeof.js
index 780384fb7..51d990be8 100644
--- a/lib/function/utils/typeof.js
+++ b/lib/function/utils/typeof.js
@@ -35,7 +35,7 @@ module.exports = function (math) {
       if (x instanceof Unit) return 'unit';
       if (x instanceof Index) return 'index';
       if (x instanceof Range) return 'range';
-      if (x instanceof Help) return 'matrix';
+      if (x instanceof Help) return 'help';
 
       if (x instanceof math.chaining.Selector) return 'selector';
     }
diff --git a/lib/type/Complex.js b/lib/type/Complex.js
index dcd1315ad..1badae28c 100644
--- a/lib/type/Complex.js
+++ b/lib/type/Complex.js
@@ -25,8 +25,7 @@ var util = require('../util/index'),
  */
 function Complex(re, im) {
   if (!(this instanceof Complex)) {
-    throw new SyntaxError(
-        'Complex constructor must be called with the new operator');
+    throw new SyntaxError('Constructor must be called with the new operator');
   }
 
   switch (arguments.length) {
diff --git a/lib/type/Help.js b/lib/type/Help.js
index 40e2b677d..2a82e54e4 100644
--- a/lib/type/Help.js
+++ b/lib/type/Help.js
@@ -14,6 +14,12 @@ var util = require('../util/index'),
  * @constructor
  */
 function Help (math, doc) {
+  if (!(this instanceof Help)) {
+    throw new SyntaxError('Constructor must be called with the new operator');
+  }
+
+  // TODO: throw an error when math or doc is not provided
+
   this.math = math;
   this.doc = doc;
 }
@@ -80,7 +86,7 @@ Help.prototype.toString = function () {
  * Export the help object to JSON
  */
 Help.prototype.toJSON = function () {
-  return object.extend({}, this.doc);
+  return object.clone(this.doc);
 };
 
 // exports
diff --git a/lib/type/Index.js b/lib/type/Index.js
index 611955185..2ae6612a2 100644
--- a/lib/type/Index.js
+++ b/lib/type/Index.js
@@ -30,8 +30,7 @@ var util = require('../util/index'),
  */
 function Index(ranges) {
   if (!(this instanceof Index)) {
-    throw new SyntaxError(
-        'Index constructor must be called with the new operator');
+    throw new SyntaxError('Constructor must be called with the new operator');
   }
 
   this._ranges = [];
diff --git a/lib/type/Matrix.js b/lib/type/Matrix.js
index fae6a3900..a9e73027c 100644
--- a/lib/type/Matrix.js
+++ b/lib/type/Matrix.js
@@ -33,7 +33,7 @@ var util = require('../util/index'),
 function Matrix(data) {
   if (!(this instanceof Matrix)) {
     throw new SyntaxError(
-        'Matrix constructor must be called with the new operator');
+        'Constructor must be called with the new operator');
   }
 
   if (data instanceof Matrix) {
diff --git a/lib/type/Range.js b/lib/type/Range.js
index 498680c8f..f30b7c072 100644
--- a/lib/type/Range.js
+++ b/lib/type/Range.js
@@ -34,8 +34,7 @@ var util = require('../util/index'),
  */
 function Range(start, end, step) {
   if (!(this instanceof Range)) {
-    throw new SyntaxError(
-        'Range constructor must be called with the new operator');
+    throw new SyntaxError('Constructor must be called with the new operator');
   }
 
   if (start != null && !number.isNumber(start)) {
diff --git a/lib/type/Unit.js b/lib/type/Unit.js
index 8448f0e0a..ae547792c 100644
--- a/lib/type/Unit.js
+++ b/lib/type/Unit.js
@@ -23,7 +23,7 @@ var util = require('../util/index'),
  */
 function Unit(value, unit) {
   if (!(this instanceof Unit)) {
-    throw new Error('Unit constructor must be called with the new operator');
+    throw new Error('Constructor must be called with the new operator');
   }
 
   if (value != null && !isNumber(value)) {
diff --git a/lib/util/object.js b/lib/util/object.js
index 6aafa63d4..12c03ce48 100644
--- a/lib/util/object.js
+++ b/lib/util/object.js
@@ -32,13 +32,19 @@ exports.clone = function clone(x) {
 
   // object
   if (x instanceof Object) {
+    if (x instanceof Number)  return new Number(x.valueOf());
+    if (x instanceof String)  return new String(x.valueOf());
+    if (x instanceof Boolean) return new Boolean(x.valueOf());
+    if (x instanceof Date)    return new Date(x.valueOf());
+    if (x instanceof RegExp)  throw new TypeError('Cannot clone ' + x);  // TODO: clone a RegExp
+
     var m = {};
     for (var key in x) {
       if (x.hasOwnProperty(key)) {
         m[key] = clone(x[key]);
       }
     }
-    return x;
+    return m;
   }
 
   // this should never happen
diff --git a/test/function/probability/random.test.js b/test/function/probability/random.test.js
index c337e0e6c..4d6fee6b6 100644
--- a/test/function/probability/random.test.js
+++ b/test/function/probability/random.test.js
@@ -59,7 +59,7 @@ describe('distribution', function () {
   describe('random', function() {
     var originalRandom;
 
-    it('should pick uniformely distributed numbers in [0, 1]', function() {
+    it('should pick uniformly distributed numbers in [0, 1]', function() {
       var picked = [];
 
       _.times(1000, function() {
@@ -69,7 +69,7 @@ describe('distribution', function () {
     });
 
 
-    it('should pick uniformely distributed numbers in [min, max]', function() {
+    it('should pick uniformly distributed numbers in [min, max]', function() {
       var picked = [];
 
       _.times(1000, function() {
@@ -78,7 +78,7 @@ describe('distribution', function () {
       assertUniformDistribution(picked, -10, 10);
     });
 
-    it('should pick uniformely distributed random matrix, with elements in [0, 1]', function() {
+    it('should pick uniformly distributed random matrix, with elements in [0, 1]', function() {
       var picked = [],
           matrices = [],
           size = [2, 3, 4];
@@ -99,7 +99,7 @@ describe('distribution', function () {
       assertUniformDistribution(picked, 0, 1);
     });
 
-    it('should pick uniformely distributed random matrix, with elements in [min, max]', function() {
+    it('should pick uniformly distributed random matrix, with elements in [min, max]', function() {
       var picked = [],
           matrices = [],
           size = [2, 3, 4];
@@ -131,7 +131,7 @@ describe('distribution', function () {
 
   describe('randomInt', function() {
 
-    it('should pick uniformely distributed integers in [min, max)', function() {
+    it('should pick uniformly distributed integers in [min, max)', function() {
       var picked = [];
 
       _.times(10000, function() {
@@ -141,7 +141,7 @@ describe('distribution', function () {
       assertUniformDistributionInt(picked, -15, -5);
     });
 
-    it('should pick uniformely distributed random matrix, with elements in [min, max)', function() {
+    it('should pick uniformly distributed random matrix, with elements in [min, max)', function() {
       var picked = [],
           matrices = [],
           size = [2, 3, 4];
diff --git a/test/function/utils/clone.test.js b/test/function/utils/clone.test.js
index 5378d3e20..8368c6947 100644
--- a/test/function/utils/clone.test.js
+++ b/test/function/utils/clone.test.js
@@ -10,6 +10,11 @@ describe('clone', function() {
     assert.strictEqual(b, 1);
   });
 
+  it('should throw an error on wrong number of arguments', function() {
+    assert.throws (function () {math.clone()}, math.error.ArgumentsError);
+    assert.throws (function () {math.clone(2, 4)}, math.error.ArgumentsError);
+  });
+
   it('should clone a bignumber', function() {
     var a = math.bignumber('2.3e500');
     var b = math.clone(a);
@@ -21,6 +26,7 @@ describe('clone', function() {
     var a = 'hello world';
     var b = math.clone(a);
     a = 'bye!';
+    assert.strictEqual(a, 'bye!');
     assert.strictEqual(b, 'hello world');
   });
 
diff --git a/test/function/utils/format.test.js b/test/function/utils/format.test.js
index 40c842921..374187e81 100644
--- a/test/function/utils/format.test.js
+++ b/test/function/utils/format.test.js
@@ -80,4 +80,10 @@ describe('format', function() {
       assert.equal(math.format(oneThird, 18), '0.333333333333333333');
     });
   });
+
+  it('should throw an error on wrong number of arguments', function() {
+    assert.throws (function () {math.format()}, math.error.ArgumentsError);
+    assert.throws (function () {math.format(1, 2, 3)}, math.error.ArgumentsError);
+  });
+
 });
\ No newline at end of file
diff --git a/test/function/utils/import.test.js b/test/function/utils/import.test.js
index ebd292aab..b99d0228e 100644
--- a/test/function/utils/import.test.js
+++ b/test/function/utils/import.test.js
@@ -99,4 +99,36 @@ describe('import', function() {
     approx.equal(estFollowers, 1422.431464053916);
   });
 
+  it.skip('should throw an error when trying to load a module when no module loader is available', function () {
+    // TODO: how to temporarily override the global function require?
+    var orig = require;
+    require = undefined;
+
+    assert.throws(function () {math.import('numbers');}, /Cannot load file: require not available/);
+
+    require = orig;
+  });
+
+  it('should throw an error in case of wrong number of arguments', function () {
+    assert.throws (function () {math.import()}, math.error.ArgumentsError);
+    assert.throws (function () {math.import('', {}, 3)}, math.error.ArgumentsError);
+
+  });
+
+  it('should throw an error in case of wrong type of arguments', function () {
+    assert.throws(function () {math.import(2)}, /Object or module name expected/);
+    assert.throws(function () {math.import(function () {})}, /Object or module name expected/);
+  });
+
+  it('should ignore properties on Object', function () {
+    Object.prototype.foo = 123;
+
+    math.import({bar: 456});
+
+    assert(!math.hasOwnProperty('foo'));
+    assert(math.hasOwnProperty('bar'));
+
+    delete Object.prototype.foo;
+  });
+
 });
\ No newline at end of file
diff --git a/test/function/utils/print.test.js b/test/function/utils/print.test.js
index 6af2ec240..bfc711502 100644
--- a/test/function/utils/print.test.js
+++ b/test/function/utils/print.test.js
@@ -17,8 +17,30 @@ describe('print', function() {
     }), 'hello, first last!');
   });
 
-  it('should round interpolate values to provided precision', function() {
+  it('should round interpolate values with provided precision', function() {
     assert.equal(math.print('pi=$pi', {pi: math.pi}, 3), 'pi=3.14');
   });
 
+  it('should leave unresolved variables untouched', function() {
+    assert.equal(math.print('$a,$b', {b: 2}), '$a,2');
+    assert.equal(math.print('$a.value,$b.value', {a: {}, b: {value: 2}}), '$a.value,2');
+  });
+
+  it('should leave trailing point intact', function() {
+    assert.equal(math.print('Hello $name.', {name: 'user'}), 'Hello user.');
+    assert.equal(math.print('Hello $name...', {name: 'user'}), 'Hello user...');
+    assert.equal(math.print('Hello $user.name.', {user: {name: 'user'}}), 'Hello user.');
+  });
+
+  it('should throw an error on wrong number of arguments', function() {
+    assert.throws (function () {math.print()}, math.error.ArgumentsError);
+    assert.throws (function () {math.print('')}, math.error.ArgumentsError);
+    assert.throws (function () {math.print('', {}, 6, 2)}, math.error.ArgumentsError);
+  });
+
+  it('should throw an error on wrong type of arguments', function() {
+    assert.throws (function () {math.print(2, {})}, TypeError);
+    assert.throws (function () {math.print('', 2)}, TypeError);
+  });
+
 });
\ No newline at end of file
diff --git a/test/function/utils/typeof.test.js b/test/function/utils/typeof.test.js
index ec97a81ee..519b5dc6b 100644
--- a/test/function/utils/typeof.test.js
+++ b/test/function/utils/typeof.test.js
@@ -1,5 +1,11 @@
 // test typeof
 var assert = require('assert'),
+    Index = require('../../../lib/type/Index'),
+    Range = require('../../../lib/type/Range'),
+    Matrix = require('../../../lib/type/Matrix'),
+    Help = require('../../../lib/type/Help'),
+    Unit = require('../../../lib/type/Unit'),
+    Complex = require('../../../lib/type/Complex'),
     math = require('../../../index')();
 
 describe('typeof', function() {
@@ -20,6 +26,7 @@ describe('typeof', function() {
   });
 
   it('should return complex type for a complex number', function() {
+    assert.equal(math.typeof(new Complex(2,3)), 'complex');
     assert.equal(math.typeof(math.complex(2,3)), 'complex');
   });
 
@@ -28,11 +35,18 @@ describe('typeof', function() {
     assert.equal(math.typeof(new Array()), 'array');
   });
 
-  it('should return matrix type for a matrix', function() {  
-    assert.equal(math.typeof(math.matrix()), 'matrix');
+  it('should return array type for an array', function() {
+    assert.equal(math.typeof([1,2,3]), 'array');
+    assert.equal(math.typeof(new Array()), 'array');
   });
 
-  it('should return unit type for a unit', function() {  
+  it('should return matrix type for a matrix', function() {  
+    assert.equal(math.typeof(math.matrix()), 'matrix');
+    assert.equal(math.typeof(new Matrix()), 'matrix');
+  });
+
+  it('should return unit type for a unit', function() {
+    assert.equal(math.typeof(new Unit(5, 'cm')), 'unit');
     assert.equal(math.typeof(math.unit('5cm')), 'unit');
   });
 
@@ -63,6 +77,18 @@ describe('typeof', function() {
     assert.equal(math.typeof(math.select(3)), 'selector');
   });
 
+  it('should return function type for an index', function() {
+    assert.equal(math.typeof(new Index([0, 10])), 'index');
+  });
+
+  it('should return function type for a range', function() {
+    assert.equal(math.typeof(new Range(0, 10)), 'range');
+  });
+
+  it('should return function type for a help object', function() {
+    assert.equal(math.typeof(new Help()), 'help');
+  });
+
   it('should return object type for an object', function() {  
     assert.equal(math.typeof({}), 'object');
     assert.equal(math.typeof(new Object()), 'object');
diff --git a/test/type/Help.test.js b/test/type/Help.test.js
index da05d1c43..4e53a9005 100644
--- a/test/type/Help.test.js
+++ b/test/type/Help.test.js
@@ -1,14 +1,125 @@
 // test Help
 var assert = require('assert'),
+    Help = require('../../lib/type/Help'),
     math = require('../../index')();
 
-var help = new math.type.Help(math, math.expression.docs.sin);
-
 describe('help', function() {
-  
+  var doc = {
+    'name': 'add',
+    'category': 'Operators',
+    'syntax': [
+      'x + y',
+      'add(x, y)'
+    ],
+    'description': 'Add two values.',
+    'examples': [
+      '2.1 + 3.6',
+      'ans - 3.6'
+    ],
+    'seealso': [
+      'subtract'
+    ]
+  };
+
   it('should generate the help for a function', function() {
-    assert.deepEqual(help.doc.name, 'sin');
-    assert.deepEqual(help.doc, math.expression.docs.sin);
+    var help = new Help(math, doc);
+
+    assert(help instanceof Help);
+    assert.deepEqual(help.doc.name, 'add');
+    assert.deepEqual(help.doc, doc);
+  });
+
+  it('should throw an error when constructed without new operator', function() {
+    assert.throws(function () {
+      Help(math, math.expression.docs.sin);
+    }, /Constructor must be called with the new operator/)
+  });
+
+  it('should test whether an object is a Help object', function() {
+    var help = new Help(math, doc);
+
+    assert.equal(Help.isHelp(help), true);
+    assert.equal(Help.isHelp(new Date()), false);
+    assert.equal(Help.isHelp({}), false);
+  });
+
+  it('should stringify a help', function() {
+    var help = new Help(math, doc);
+    assert.equal(help.toString(),
+        '\nName: add\n' +
+        '\n'+
+        'Category: Operators\n' +
+        '\n' +
+        'Description:\n' +
+        '    Add two values.\n' +
+        '\n' +
+        'Syntax:\n' +
+        '    x + y\n' +
+        '    add(x, y)\n' +
+        '\n' +
+        'Examples:\n' +
+        '    2.1 + 3.6\n' +
+        '        5.7\n' +
+        '    ans - 3.6\n' +
+        '        2.1\n' +
+        '\n' +
+        'See also: subtract\n');
+  });
+
+  it('should stringify a help with empty doc', function() {
+    var help = new Help(math);
+    assert.equal(help.toString(), '\n');
+  });
+
+  it('should stringify a help without doc', function() {
+    var help = new Help(math);
+    assert.equal(help.toString(), '\n');
+  });
+
+  it('should stringify a doc with empty example', function() {
+    var help = new Help(math, {
+      'name': 'add',
+      'examples': [
+        '2 + 3',
+        ''
+      ]
+    });
+
+    assert.equal(help.toString(),
+        '\nName: add\n' +
+        '\n'+
+        'Examples:\n' +
+        '    2 + 3\n' +
+        '        5\n' +
+        '    \n' +
+        '\n');
+  });
+
+  it('should stringify a doc with example throwing an error', function() {
+    var help = new Help(math, {
+      'name': 'add',
+      'examples': [
+        '2 ++ 3'
+      ]
+    });
+
+    assert.equal(help.toString(),
+        '\nName: add\n' +
+        '\n'+
+        'Examples:\n' +
+        '    2 ++ 3\n' +
+        '        SyntaxError: Value expected (char 4)\n' +
+        '\n');
+  });
+
+  it('should export doc to JSON', function() {
+    var help = new Help(math, doc);
+    var json = help.toJSON();
+    assert.deepEqual(json, doc);
+    json.name = 'foo';            // this should not alter the original doc
+    json.examples.push('2 + 3'); // this should not alter the original doc
+    assert.equal(doc.name, 'add');
+    assert.notEqual(json.examples.length, doc.examples.length);
   });
 
 });
\ No newline at end of file
diff --git a/test/util/number.test.js b/test/util/number.test.js
index b2d0d1a54..d55b3b7fc 100644
--- a/test/util/number.test.js
+++ b/test/util/number.test.js
@@ -314,7 +314,7 @@ describe('number', function() {
 
     describe('bignumber', function () {
       before (function () {
-        math.type.BigNumber.config(20); // ensure the precision is 20 digits, the default
+        BigNumber.config(20); // ensure the precision is 20 digits, the default
       });
 
       it('should format big numbers', function() {