Fuzzing for JavaScript objects and functions

Using an existing object or array of function arguments as a schema, and mutates or generates based on that schema. Extensible to add new types, mutators or generators.

For more documentation see: http://apowers313.github.io/js-fuzzing/

npm install js-fuzz

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var FuzzGen = require("js-fuzzing");
var options = {
    count: 1000,
    mutateChance: function() {},
    generateChance: function() {},
    selectChance: function() {},
    allowedErrors: [
        new Error ("argument not allowed")
    ],
    passAllowed: false,
    timeout: false,
    argLimits: [
        undefined,
        ["!LargeNum", "!ZeroNum"]
    ]
}
var fg = new FuzzGen ();
fg.fn (yourFunction, opts);

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There are three ways to extend the fuzzing functionality:

• registerType - Add a new type (Object, String, HexString, Base64EncodedString, etc.)
• registerMutator - Add a new mutator to an existing type
• registerGenerator - Add a new generator to an existing type

registerType (name, obj, [parent])

• name - A string for the name of the new type, all lower case and appropriate for being used as a key in an object (e.g. - "hexstring", "object", "binaryarray")
• obj - An object describing the new type. It must contain a method check which takes any type and returns true / false based on whether the thing passed in is one of your type. Can also have an array of generate or mutate for the corresponding functions, described in registerMutator and registerGenerator below. An object of subtype will be created empty and added to as subtypes are registered.
• parent - An optional string describing the parent type. For example, "array", "date", and "regexp" all have a parent type of "object".

check is called by resolveType only one return type from resolveType called hierarchically -- whichever check call matches first and whichever of the subtypes matches under that type (or the parent type if none of the subtypes match) TODO

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// TODO: new types: // - JSON // - JWT // - base64 // - hex // - ByteArray // - TypedArray // - arrayofbytes // - HTML