LimitTest.java

package com.annimon.stream.doublestreamtests;

import com.annimon.stream.DoubleStream;
import org.junit.Test;
import static com.annimon.stream.test.hamcrest.DoubleStreamMatcher.assertElements;
import static com.annimon.stream.test.hamcrest.DoubleStreamMatcher.assertIsEmpty;
import static org.hamcrest.Matchers.arrayContaining;

public final class LimitTest {

    @Test
    public void testLimit() {
        DoubleStream.of(0.1, 0.2, 0.3)
                .limit(2)
                .custom(assertElements(arrayContaining(
                        0.1, 0.2
                )));
    }

    @Test(expected = IllegalArgumentException.class)
    public void testLimitNegative() {
        DoubleStream.of(0.1, 2.345).limit(-2).count();
    }

    @Test
    public void testLimitZero() {
        DoubleStream.of(0.1, 0.2, 0.3)
                .limit(0)
                .custom(assertIsEmpty());
    }

    @Test
    public void testLimitMoreThanCount() {
        DoubleStream.of(0.1, 0.2, 0.3)
                .limit(5)
                .custom(assertElements(arrayContaining(
                        0.1, 0.2, 0.3
                )));
    }
}