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behaviour.js
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behaviour.js
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// ------------------------------------------------------------ Function augmentation
/**
* Standard means of augmenting everything with new methods
*
* @param name the name of the new method
* @param func the function we want invoked
*/
Object.prototype.method = function(name, func) {
if (!this.prototype[name]) {
this.prototype[name] = func;
return this;
}
};
// ------------------------------------------------------------ Should DSL
behaviourJs = {};
behaviourJs._shouldBe = function(expected) {
if(expected !== null) {
var exp = expected.valueOf();
var self = this.valueOf();
if(self === exp) {
return;
}
}
throw {
name: 'AssertionError',
message: 'Expected ' + expected + ' but was ' + this
};
};
Object.method('shouldBe', behaviourJs._shouldBe);
Object.method('shouldEqual', behaviourJs._shouldBe);
Object.method('shouldBeEqual', behaviourJs._shouldBe);
Object.method('shouldBeEqualTo', behaviourJs._shouldBe);
behaviourJs._shouldNotBe = function(expected) {
if(expected !== null) {
var exp = expected.valueOf();
var self = this.valueOf();
if (self !== exp) {
return;
}
throw {
name: 'AssertionError',
message: 'Expected not to be ' + expected + ' but was ' + this
};
}
};
Object.method('shouldNotBe', behaviourJs._shouldNotBe);
Object.method('shouldNotEqual', behaviourJs._shouldNotBe);
Object.method('shouldntBe', behaviourJs._shouldNotBe);
Object.method('shouldntEqual', behaviourJs._shouldNotBe);
// ------------------------------------------------------------ StoryInstance
behaviourJs.StoryInstance = function(block) {
block.call(this);
};
behaviourJs.StoryInstance.prototype.visit = function(visitor) {
visitor.visitStory(this);
};
behaviourJs.StoryInstance.prototype.run = function() {
this.visit(new behaviourJs.StoryRunner());
};
// ------------------------------------------------------------ ScenarioInstance
/**
* A runnable scenario.
*
* @param name the description of the scenario
* @param block the function containing the contents of the scenario (usually
* a series of Givens,When and Thens).
*/
behaviourJs.ScenarioInstance = function(name, block) {
this.name = name;
this._steps = [];
behaviourJs.ScenarioInstance.__currentScenario = this;
block.call();
behaviourJs.ScenarioInstance.__currentScenario = null;
behaviourJs.ScenarioInstance.__currentPhase = null;
};
behaviourJs.ScenarioInstance.__currentScenario = null;
behaviourJs.ScenarioInstance.__currentPhase = null;
behaviourJs.ScenarioInstance.prototype.addStep = function(step) {
this._steps[this._steps.length] = step;
};
behaviourJs.ScenarioInstance.prototype.visit = function(visitor) {
visitor.visitScenario(this);
};
// ------------------------------------------------------------ Step
behaviourJs.Step = function(type, meta, block) {
this._type = type;
this._meta = meta;
this._block = block;
};
behaviourJs.Step.prototype.visit = function(visitor) {
visitor.visitStep(this);
};
// ------------------------------------------------------------ StoryRunner
behaviourJs.StoryRunner = function() {
this.storyCtx = {};
};
behaviourJs.StoryRunner.prototype.visitStory = function(story) {
var title = 'Story: ' + story.description;
document.writeln(title);
var line = '';
for(var i = 0; i < title.length; ++i) {
line += '=';
}
document.writeln(line);
for (var scenIndex = 0; scenIndex < story.scenarios.length; ++scenIndex) {
story.scenarios[scenIndex].visit(this);
}
};
behaviourJs.StoryRunner.prototype.visitScenario = function(scenario) {
document.writeln('Scenario: ' + scenario.name);
for (var stepIndex = 0; stepIndex < scenario._steps.length; ++stepIndex) {
var step = scenario._steps[stepIndex];
step.visit(this);
}
document.write("\n");
};
behaviourJs.StoryRunner.prototype.visitStep = function(step) {
var stepDesc = step._type.toUpperCase() + ' ' + step._meta;
if (step._block === undefined || step._block === null) {
if (step._type === 'then') {
stepDesc += ' [PENDING]';
}
} else {
try {
step._block.call(this.storyCtx);
} catch(e) {
if (e.name == 'AssertionError') {
stepDesc += ' [FAIL : ' + e.message + ']';
} else {
stepDesc += ' [ERROR (' + e.name + ') : ' + e.message + ']';
}
}
}
document.writeln(stepDesc);
};
// ------------------------------------------------------------ DSL
Story = function(block) {
return new behaviourJs.StoryInstance(block);
};
Scenario = function(name, block) {
return new behaviourJs.ScenarioInstance(name, block);
};
Given = function(desc, block) {
var scenario = behaviourJs.ScenarioInstance.__currentScenario;
behaviourJs.ScenarioInstance.__currentPhase = 'given';
scenario.addStep(new behaviourJs.Step(behaviourJs.ScenarioInstance.__currentPhase, desc, block));
};
When = function(desc, block) {
var scenario = behaviourJs.ScenarioInstance.__currentScenario;
behaviourJs.ScenarioInstance.__currentPhase = 'when';
scenario.addStep(new behaviourJs.Step(behaviourJs.ScenarioInstance.__currentPhase, desc, block));
};
Then = function(desc, block) {
var scenario = behaviourJs.ScenarioInstance.__currentScenario;
behaviourJs.ScenarioInstance.__currentPhase = 'then';
scenario.addStep(new behaviourJs.Step(behaviourJs.ScenarioInstance.__currentPhase, desc, block));
};
And = function(desc, block) {
var scenario = behaviourJs.ScenarioInstance.__currentScenario;
scenario.addStep(new behaviourJs.Step(behaviourJs.ScenarioInstance.__currentPhase, desc, block));
};