ch.powerunit.collector

Class CollectorTester<T,A,R>

java.lang.Object

ch.powerunit.collector.CollectorTester<T,A,R>

Type Parameters:

T - the input type of the Collector .

A - the accumulator type of the Collector.

R - the return type of the Collector.

@TestInterface(value=ch.powerunit.collector.impl.CollectorTesterImpl.class)
public final class CollectorTester<T,A,R>
extends Object

This is a tester for Collector.

The goal of this tester is to validate a Collector. The following tests are done :

1. accumulator() must return a not null result.
2. combiner() must return a not null result.
3. finisher() must return a not null result.
4. supplier() must return a not null result.
5. characteristics() must return a not null result and be the same list that is specified in this tester.
6. For each received sample either use it - withInput - or create a stream - withStreamFromList or withParallelStreamFromList - and then execute the method collect with the Collector under test and validate the returned result.

Since:

0.4.0

Author:

borettim

Method Summary

Modifier and Type	Method and Description
Collector<T,A,R>	getCollectorToTest() Used by the framework.
Matcher<Iterable<? extends Collector.Characteristics>>	getExpectedCharacteristics() Used by the framework.
List<Stream<T>>	getInputs() Used by the framework.
List<Matcher<? super R>>	getResults() Used by the framework.
static <T,R> CollectorTesterDSL0<T,?,R>	of(Class<T> inputClass, Class<T> outputClass, Collector<T,?,R> collectorToTest) Return a builder to create a tester of Collector.
static <T,R> CollectorTesterDSL0<T,?,R>	of(Collector<T,?,R> collectorToTest) Return a builder to create a tester of Collector.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

of

public static <T,R> CollectorTesterDSL0<T,?,R> of(Collector<T,?,R> collectorToTest)

Return a builder to create a tester of Collector.

Type Parameters:

T - the input type of the Collector .

R - the return type of the Collector.

Parameters:

collectorToTest - the Collector to be tested.

Returns:

the DSL to build the tester

of

public static <T,R> CollectorTesterDSL0<T,?,R> of(Class<T> inputClass,
                                                  Class<T> outputClass,
                                                  Collector<T,?,R> collectorToTest)

Return a builder to create a tester of Collector.

Type Parameters:

T - the input type of the Collector.

R - the return type of the Collector.

Parameters:

inputClass - the class of the input of the Collector.

outputClass - the class of the output of the Collector.

collectorToTest - the Collector to be tested.

Returns:

the DSL to build the tester

getCollectorToTest

public Collector<T,A,R> getCollectorToTest()

Used by the framework.

Returns:

the collectorToTest

getInputs

public List<Stream<T>> getInputs()

Used by the framework.

Returns:

the inputs

getResults

public List<Matcher<? super R>> getResults()

Used by the framework.

Returns:

the results

getExpectedCharacteristics

public Matcher<Iterable<? extends Collector.Characteristics>> getExpectedCharacteristics()

Used by the framework.

Returns:

the expectedCharacteristics