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add-matchers
Advanced tools
What: A JavaScript library to write test Matchers compatible with all versions of Jest and Jasmine.
Why: The way you write tests in Jasmine and Jest is extremely similar, but the APIs for adding custom matchers vary wildly between Jasmine 1.x, Jasmine 2.x, and Jest. This library aims to remove those obstacles and encourage Developers to share useful matchers they've created with the community.
How: Developers use the API from this library, which converts them to be compatible with whichever test framework is running.
npm install --save-dev add-matchers
Include add-matchers after your test framework but before your tests, and register your matchers before your tests as well.
import { addMatchers } from 'add-matchers';
addMatchers({
toBeFoo(value) {
return value === 'foo';
},
toInclude(other, value) {
return value.includes(other);
}
});
expect('foo').toBeFoo();
expect('jamie').toInclude('jam');
import { addMatchers } from 'add-matchers';
addMatchers.asymmetric({
toBeFoo(value) {
return value === 'foo';
},
toInclude(other, value) {
return value.includes(other);
}
});
expect({ key: 'foo', prop: 'bar' }).toEqual({
key: any.toBeFoo(),
prop: any.toInclude('ar')
});
The argument passed to expect
is always the last argument passed to your
Matcher, with any other arguments appearing before it in the order they were
supplied.
This means that, in the case of
expect(received).toBeAwesome(arg1, arg2, arg3)
, your function will be called
with fn(arg1, arg2, arg3, received)
.
Arguments are ordered in this way to support partial application and increase re-use of matchers.
If we wanted to use the following Matchers in our tests;
// matcher with 0 arguments
expect(4).toBeEvenNumber();
// matcher with 1 argument
expect({}).toBeOfType('Object');
// matcher with Many arguments
expect([100, 14, 15, 2]).toContainItems(2, 15, 100);
We would create them as follows;
import { addMatchers } from 'add-matchers';
addMatchers({
// matcher with 0 arguments
toBeEvenNumber: function(received) {
// received : 4
return received % 2 === 0;
},
// matcher with 1 argument
toBeOfType: function(type, received) {
// type : 'Object'
// received : {}
return Object.prototype.toString.call(received) === '[object ' + type + ']';
},
// matcher with many arguments
toContainItems: function(arg1, arg2, arg3, received) {
// arg1 : 2
// arg2 : 15
// arg3 : 100
// received : [100, 14, 15, 2]
return (
received.indexOf(arg1) !== -1 &&
received.indexOf(arg2) !== -1 &&
received.indexOf(arg3) !== -1
);
}
});
For more examples, see Jasmine Matchers which is built using this library.
describe
and it
blocks.FAQs
Write useful test matchers compatible with Jest and Jasmine.
The npm package add-matchers receives a total of 32,024 weekly downloads. As such, add-matchers popularity was classified as popular.
We found that add-matchers demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
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