FakeRandom class

A fake Random implementation that always produces a given sequence of values. It should only be used in tests.

Why prefer a FakeRandom over a seeded Random?

A FakeRandom avoids depending on implementation details. A seeded Random is implicitly dependent on the underlying PRNG algorithm. The generated values may change if the algorithm changes. Furthermore, reverse-engineering a seed is cumbersome.

Implemented types

Random

Available extensions

Randoms

Annotations

@visibleForTesting

Constructors

FakeRandom({Iterable<int> ints = const [], Iterable<double> doubles = const [], Iterable<bool> bools = const []}): Creates a FakeRandom with the Iterables used by the various function to produce values.

Properties

hashCode → int: The hash code for this object.
no setterinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

Methods

doubles({int? length, double min = 0.0, double max = 1.0}) → Stream<double>: Available on Random, provided by the Randoms extension
Returns a Stream of length that produces random doubles in the range, [min] <= value < [max].
ints({int? length, int min = 0, required int max}) → Stream<int>: Available on Random, provided by the Randoms extension
Returns a Stream of length that produces random integers in the range, [min] <= value < [max].
nextBool() → bool: Returns the next boolean in the iterable.
override
nextBoundedDouble(double min, double max) → double: Available on Random, provided by the Randoms extension
Generates a random double in the range, [min] <= value < [max].
nextBoundedInt(int min, int max) → int: Available on Random, provided by the Randoms extension
Generates a random integer uniformly distributed in the range, [min] <= value < [max].
nextDouble() → double: Returns the next double in the iterable.
override
nextInt(int max) → int: Returns the next integer in the iterable.
override
nextWeightedBool(double probability) → bool: Available on Random, provided by the Randoms extension
Returns a weighted boolean value based on probability.
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
toString() → String: A string representation of this object.
inherited

Operators

operator ==(Object other) → bool: The equality operator.
inherited