The Fluent Assertions library written in Dart.

It uses Dart's Extension Functions to provide a fluent wrapper around test assertions.

Usage

Basic Assertions

These assertions are available for all objects.

Equality

'Hello'.shouldBeEqualTo('Hello');

'Hello'.shouldNotBeEqualTo('Word');

Reference equality

final me = Person(name: 'Karol');
final someoneElse = Person(name: 'Karol');
me.shouldBe(me);
me.shouldNotBe(someoneElse);

Subtypes

const num numberOfGirlsIAttract = 0;
numberOfGirlsIAttract.shouldBeInstanceOf<int>();
numberOfGirlsIAttract.shouldNotBeInstanceOf<double>();

Nullability

const hello = 'Hello';
hello.shouldNotBeNull();

const hello = null;
hello.shouldBeNull();

Booleans

const hasChildren = true;
hasChildren.shouldBeTrue();
hasChildren.shouldNotBeFalse();

const hasChildren = false;
hasChildren.shouldBeFalse();
hasChildren.shouldNotBeTrue();

Numerical Assertions

2.shouldBeGreaterOrEqualTo(2);

2.shouldBeGreaterThan(1);

2.shouldBeLessOrEqualTo(2);

1.shouldBeLessThan(2);

1.shouldBePositive();
1.shouldNotBeNegative();

(-1).shouldBeNegative();
(-1).shouldNotBePositive();

0.shouldBeZero();
1.shouldNotBeZero();

0.999.shouldBeNear(1, delta: 0.01);

0.shouldNotBeInRange(lowerBound: 1, upperBound: 6);
1.shouldBeInRange(lowerBound: 1, upperBound: 6);

CharSequence Assertions

Collection Assertions

Features and bugs

Please file feature requests and bugs at the issue tracker.

Author

• Karol Lisiewicz