DYP: asserts for large objects

Fuzzy deep equal for asserting parts of objects

One object is a subset of the another

const dyp = require('dyp');

// ok
dyp({ foo: 1, bar: 2 }, { foo: 1 });

// throws exception
dyp({ foo: 1, bar: 2 }, { foo: 1, baz: 9 });

Checks also nested objects

// ok
dyp(
    { foo: { a: 1, b: 2 } },
    { foo: { a: 1 } }
);

// throws exception
dyp(
    { foo: { a: 1, b: 2 } },
    { foo: { x: 0 } }
);

Arrays should keep the same order and size

const dyp = require('dyp');

// ok
dyp({ foo: [1, { bar: 2, baz: 3 }] }, { foo: [1, { bar: 2 }] });

// throws exception
dyp({ foo: [1, { bar: 2, baz: 3 }] }, { foo: [{ bar: 2 }] });

// throws exception
dyp({ foo: [1, { bar: 2, baz: 3 }] }, { foo: [1, { baz: 9 }] });

But you can just look for elements inside the array

const dyp = require('dyp');

// ok
dyp({
    foo: [{ foo: 1 }, { bar: 2, sasa: 1 }, { baz: 3 }]
}, {
    foo: dyp.arrayIncludes({ bar: 2 })
});

// ok
dyp({
    foo: [{ foo: 1 }, { bar: 2, sasa: 1 }, { baz: 3 }]
}, {
    foo: dyp.arrayIncludesEvery([
        { baz: 3 }, { bar: 2 },
    ])
});

// throws exception
dyp({
    foo: [{ foo: 1 }, { bar: 2, sasa: 1 }, { baz: 3 }]
}, {
    foo: dyp.arrayIncludes({ sasalele: 2 })
});

Or you can check only the size of the array

const dyp = require('dyp');

// ok
dyp({ foo: [1, { bar: 2, baz: 3 }] }, { foo: dyp.arrayOfLength(2) });

// throws exception
dyp({ foo: [1, { bar: 2, baz: 3 }] }, { foo: dyp.arrayOfLength(3) });

Full example

const dyp = require('dyp');

const actual = {
    foo: 1,
    bar: 2,
    nested: {
        sasa: 3,
        lele: 4
    },
    list: [1, 2, 3],
    data: [
        { foo: 1 },
        { bar: 2 },
        { baz: 3 }
    ],
    full: [
        { a: 1, x: 1 },
        { a: 2, x: 2 }
    ]
};

// ok
dyp(actual, {
    foo: 1,
    nested: {
        sasa: 3
    },
    list: dyp.arrayOfLength(3),
    data: dyp.arrayIncludesEvery([
        { bar: 2 },
        { baz: 3 }
    ]),
    full: [
        { a: 1 },
        { a: 2 }
    ]
});

API

the assertion function dyp(actual, expected[, message]):void

utility for specifying an array of fixed length dyp.arrayOfLength(length)

search for element in array dyp.arrayIncludes(element)

array contains all provided elements dyp.arrayIncludesEvery(elements)

utility for specifying an object with fixed number of properties dyp.numberOfKeys(keys)