/*
* Copyright 2016 Dennis Vriend
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.github.dnvriend.streams.stage.simple
import akka.stream.testkit.scaladsl.TestSink
import com.github.dnvriend.streams.TestSpec
class FilterStageTest extends TestSpec {
/**
* Only pass on those elements that satisfy the given predicate.
*
* - Emits when: the given predicate returns true for the element
* - Backpressures when: the given predicate returns true for the element and downstream backpressures
* - Completes when: upstream completes
* - Cancels when: downstream cancels
*/
"Filter a sequence of numbers for even numbers" should "emit only even numbers" in {
withIterator() { src ⇒
src.take(10)
.filter(_ % 2 == 0)
.runWith(TestSink.probe[Int])
.request(Integer.MAX_VALUE)
.expectNext(0, 2, 4, 6, 8)
.expectComplete()
}
}
}
