ValueVariant<T> class Null safety

A TestVariant that runs separate tests with each of the given values.

To use this variant, define it before the test, and then access currentValue inside the test.

The values are typically enums, but they don't have to be. The toString for the given value will be used to describe the variant. Values will have their type name stripped from their toString output, so that enum values will only print the value, not the type.

This example shows how to set up the test to access the currentValue. In this example, two tests will be run, one with value1, and one with value2. The test with value2 will fail. The names of the tests will be:

  • Test handling of TestScenario (value1)
  • Test handling of TestScenario (value2)
enum TestScenario {
  value1,
  value2,
  value3,
}

final ValueVariant<TestScenario> variants = ValueVariant<TestScenario>(
  <TestScenario>{value1, value2},
);

testWidgets('Test handling of TestScenario', (WidgetTester tester) {
  expect(variants.currentValue, equals(value1));
}, variant: variants);
Inheritance

Constructors

ValueVariant(Set<T> values)
Creates a ValueVariant that tests the given values.

Properties

currentValue → T?
Returns the value currently under test.
read-only
hashCode int
The hash code for this object. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
values Set<T>
Returns an iterable of the variations that this test dimension represents. [...]
final

Methods

describeValue(T value) String
Returns the string that will be used to both add to the test description, and be printed when a test fails for this variation.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
setUp(T value) Future<T>
A function that will be called before each value is tested, with the value that will be tested. [...]
override
tearDown(T value, covariant T memento) Future<void>
A function that is guaranteed to be called after a value is tested, even if it throws an exception. [...]
override
toString() String
Returns a string representation of this object.
inherited

Operators

operator ==(Object other) bool
The equality operator. [...]
inherited