What could be the reason behind the failure of the Jasmine test?

I am currently developing a basic JavaScript program for scoring in tenpin bowling. So far, I have created two functions - Frame and Game. For testing purposes, I have set up a mock frame named "frameOne". The specific test causing me trouble is as follows:

it('can take a frame as a parameter', function(){
frame.frameOne.and.callFake(function(){
[5, 5, 'spare'];
});
expect(game.frame1(frame)).toBe([5, 5, 'spare']);
});`    

The game logic being tested by this code snippet is shown below:

Game.prototype.frame1 = function (frame) {
frame.frameOne;
return [5, 5, 'spare'];
};

Despite being new to Jasmine and coding in general, I believe that the code could be incorrect. However, my confusion arises from the error message displayed by Jasmine when running the test:

Expected [ 5, 5, 'spare' ] to be [ 5, 5, 'spare' ]

To me, this seems like a match rather than a failure. Interestingly, substituting the arrays with the value true results in a pass. Why does Jasmine claim that the arrays are not identical even though they seemingly match?

Any thoughts or suggestions would be highly appreciated!

Answer №1

The comparison operation toBe functions as a strict equality check with ===. Although two arrays may appear identical, they are not deemed equal if they are distinct objects in JavaScript. Non-primitive data types such as objects, functions, and arrays are only considered equal when referencing the same underlying object.

For scenarios like this, it is recommended to utilize toEqual instead. This method evaluates object equality by comparing properties and their respective values:

expect(game.frame1(frame)).toEqual([5, 5, 'spare']);

Answer №2

Due to the presence of two distinct arrays in your code, both containing identical values.

When it comes to objects (such as arrays) in JavaScript, comparisons are made through a Reference comparison. You are dealing with two separate array instances, rather than two references pointing to the same array.

For further clarification, you may find this resource helpful: Object Equality in JavaScript

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