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Small but comprehensive mock object library for Node

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Readme.md

Mocket

Mocking library for nodejs

Features

  • simple and lightweight
  • no need to import/instantiate constructors or objects for the mocks
  • expect many, n, at least n, at most n calls
  • allow/ignore calls
  • flexible argument matching: explicit values, by type, match function
  • define return values directly, by function, or delegate

Installation

$ npm install mocket

License

(MIT License)

Copyright (c) 2011 David Harvey <@teamsandtechnology.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Usage - basic

Require mocket, create a context:

   var mocket = require('mocket');
   var context = new mocket.Mocket();

Create a mock:

   var mock = context.createMock();

Set up expectations (note chaining of expectations):

  mock.expects("func").passing("hello", context.ANYTHING).atLeast(2).returning("goodbye");

Call the mock:

  mock.func("hello", 42);

Check the expectations - boolean:

  var OK = context.verifyMocks();
  OK = context.verifyMocks(true); // logs to stdout

... or assert (throws assert.AssertionError):

  context.assertMocks();

Collect verification status:

  // Collector object
  var collector = {
    ok         : function (expectation) {console.log(expectation.toString())},
    fail       : function (expectation) {console.error(expectation.toString())},
    unexpected : function (mock, methodWithArgs) {console.error(mock.name + "." + methodWithArgs.name + argumentsToString(methodWithArgs.args) + " UNEXPECTED")}
  };
  OK = context.verifyMocks(collector); // collect mock status for logging/reporting

Usage - number of calls

Call at least once is default:

  mock.expects("func");
  context.verifyMocks(); // false

  mock.func();
  context.verifyMocks(); // true

  mock.func();
  context.verifyMocks(); // true

Call a specific number of times:

  mock.expects("func").times(3);
  context.verifyMocks(); // false

  mock.func();
  context.verifyMocks(); // false

  mock.func();
  mock.func();
  context.verifyMocks(); // true

  mock.func();
  context.verifyMocks(); // false

Call at least/at most n times:

  mock1.expects("func").atLeast(3);
  mock2.expects("func").atMost(7);
  mock3.expects("func").atLeast(2).atMost(4);

Expect never to be called:

  mock.expects("func").never();
  context.verifyMocks(); // true

  mock.func();
  context.verifyMocks(); // false

Ignore all calls to named function:

  mock.allows("func");
  context.verifyMocks(); // true

  mock.func();
  context.verifyMocks(); // trues

Usage - argument matching

Match literal arguments:

  mock.expects("func").passing("hello", 1);
  mock.func("hello", 1);
  context.verifyMocks(); // true

  mock.func("goodbye", 2);
  context.verifyMocks(); // false

Match any arguments:

  mock.expects("func").passing(context.ANYARGS);
  mock.func("hello", 1);
  context.verifyMocks(); // true

  mock.func();
  mock.func([1,2,3]);
  mock.func("goodbye", 2);
  context.verifyMocks(); // true

Match any argument in a given position:

  mock.expects("func").passing("hello", context.ANYTHING);
  mock.func("hello", 1);
  context.verifyMocks(); // true

  mock.func("hello", [2,3,4]);
  context.verifyMocks(); // true

  mock.func("goodbye", [2,3,4]);
  context.verifyMocks(); // false

Match an argument of a given type (type string as returned by typeof operator):

  mock.expects("func").passing(context.any('number'));
  mock.func(1);
  mock.func(3.1412);
  context.verifyMocks(); // true

  mock.func("whoops");
  context.verifyMocks(); // false

Match an argument with a given constructor:

  function Foo() {}
  function Bar() {}

  mock.expects("func").passing(context.any(Foo));

  mock.func(new Foo());
  context.verifyMocks(); // true

  mock.func(new Bar());
  context.verifyMocks(); // false

Match an argument with a function:

  mock.expects("func").passing(function(a) {return a === 1 || a === 2});
  mock.func(1);
  context.verifyMocks(); // true

  mock.func(3);
  context.verifyMocks(); // false

Usage - returning values, throwing exceptions:

Return same value for every call:

  mock.expects("func").returning(123);
  var ret = mock.func(); // ret === 123

Return values depending on parameter expectation:

  mock.expects("func").passing("hello").returning(123);
  mock.expects("func").passing("goodbye").returning(456);
  var ret1 = mock.func("hello");   // ret1 === 123
  var ret2 = mock.func("goodbye"); // ret2 === 456

Return different values from successive calls (if more calls than values, last value given is returned):

  mock.expects("func").returning(123, 456, 789);
  var ret = mock.func(); // ret === 123
  ret = mock.func(); // ret === 456
  ret = mock.func(); // ret === 789
  ret = mock.func(); // ret === 789

Throw an instance of Error:

  mock.expects("func").throwing();
  mock.func();   // throws new Error()

Throw an instance of custom exception:

  function MyException() {}
  mock.expects("func").throwing(MyException);
  mock.func();   // throws new MyException()

Throw a preconstructed instance of custom exception:

  function MyException(message) {
    this.message = message;
    this.name = "MyException";
  }
  mock.expects("func").throwing(new MyException("from mock"));
  mock.func();   // throws passed object as exception

Usage - stubbing, delegating:

Return values via a stubbed function:

  mock.expects("func").passing(context.any('number')).as(function (n) {return n * 2});
  var ret1 = mock.func(10);   // ret1 === 20
  var ret2 = mock.func(7.5);  // ret2 === 15

Return values via a delegate:

  var delegate = {
    func1 : function(n) { return n * 2 },
    func2 : function(s) { return s + ", indeed!" }
  };

  mock.expects("func1").passing(context.any('number')).as(delegate);
  mock.expects("func2").passing(context.any('string')).as(delegate);
  var ret1 = mock.func1(10);    // ret1 === 20
  var ret2 = mock.func2("hey"); // ret2 === "hey indeed!"
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