Expector

Build Status

This package provides a way to write tests more easily in a fluent manner (with content assists).

Instead of writing expect(value, and provide a matcher to check the value, just type expectThat(value). and let the content assist do its job!

Usage

A simple usage example:

import 'package:expector/expector.dart';
import 'package:test/test.dart';

String? f() => 'hello';

void main() {
  test('f() returns a 5-length string', () {
    expectThat(f()).isNotNull
      ..isNotEmpty
      ..hasLength(5);
  });
}

What's the problem with test package ?

The test package allows users to describe expectations with matchers: expect(value, matcher). Unfortunatelly there are a lot of matchers and it's easy to use a matcher that has no meaning regarding the value tested. In this case, there will be no error at compile time but there will be a runtime error. For instance:

import 'package:test/test.dart';

String? f() => 'hello';

void main() {
  test('f() returns a 5-length string', () {
    expect(f(), isNotNull);
    expect(f(), isNotEmpty);
    expect(f(), hasLength(5));
    expect(f(), isNaN); // no compile time
  });
}

Another issue is that there is no content assist to help user. Everything is suitable as matcher and it could be hard to find the good one.

License

Apache 2.0

Libraries

expector
A library to write tests in a fluent manner and more easily. [...]