Asserts the items contained by a Set satisfy a particular list of items.

expect(new Set([1, 2, 3]), 'to have items satisfying', [1, { foo: 'bar' }, 3]);

expected new Set([ 1, 2, 3 ]) to have items satisfying [ 1, { foo: 'bar' }, 3 ]
 
new Set([
  
1, 
//
 
should equal 
[ 1, { foo: 'bar' }, 3 ]
2, 
//
 
should equal 
[ 1, { foo: 'bar' }, 3 ]
3 
//
 
should equal 
[ 1, { foo: 'bar' }, 3 ]
])

In order to check a property holds for all the items, an assertion can be passed as the argument – in this example we assert that all the items in the set are numbers:

expect(new Set([1, 2, []]), 'to have items satisfying', 'to be a number');

expected new Set([ 1, 2, [] ]) to have items satisfying to be a number
 
new Set([
  
1,
2,
[] 
//
 
should be a number
])

The exact number of elements in a Set must always be matched. However, nested objects are, be default, compared using "satisfy" semantics which allow missing properties. In order to enforce that all properties are present, the exhaustively flag can be used:

expect(new Set([[{ foo: true, bar: true }], [1]]), 'to have items satisfying', [
  expect.it('to be an object'),
]);

expected Set to have items satisfying [ expect.it('to be an object') ]
 
new Set([
  
[ { foo: true, bar: true } ],
[
  
1 
//
 
should be an object
]
])