ぶれいすさんのやつ、http://bleis-tift.hatenablog.com/entry/20120119/1326944722 Javaでやってみたのテスト

再帰よく分からんTest.java

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;

import java.util.Arrays;
import java.util.List;

import org.junit.Test;


public class RecursiveTest {

	@Test
	public void testSum() {
		int actual = Recursive.sum(Arrays.asList(new Integer[]{1, 2, 3, 4, 5}));
		int expected = 15;
		assertThat(actual, is(expected));
	}

	@Test
	public void testLength() {
		int actual = Recursive.length(Arrays.asList(new Integer[]{5, 4, 3, 2, 1}));
		int expected = 5;
		assertThat(actual, is(expected));
	}
	
	@Test
	public void testMax() {
		int actual = Recursive.max(Arrays.asList(new Integer[]{1, 200, 3, 4, 10}));
		int expected = 200;
		assertThat(actual, is(expected));
	}
	
	@Test
	public void testForAll_not_match() {
		boolean actual = Recursive.forall(Arrays.asList(new Integer[]{1, 200, 3, 4, 10}), i -> i % 2 == 0);
		boolean expected = false;
		assertThat(actual, is(expected));
	}

	@Test
	public void testForAll_all_match() {
		boolean actual = Recursive.forall(Arrays.asList(new Integer[]{2, 4, 6, 8, 10}), i -> i % 2 == 0);
		boolean expected = true;
		assertThat(actual, is(expected));
	}
	
	@Test
	public void testFind_not_match() {
		int actual = Recursive.find(Arrays.asList(new Integer[]{2, 4, 6, 8, 10}), i -> i  == 100);
		int expected = 0;
		assertThat(actual, is(expected));
	}
	@Test
	public void testFind_match() {
		int actual = Recursive.find(Arrays.asList(new Integer[]{2, 4, 6, 8, 100}), i -> i  == 100);
		int expected = 100;
		assertThat(actual, is(expected));
	}
	@Test
	public void testSkip() {
		List<Integer> actual = Recursive.skip(Arrays.asList(new Integer[]{1, 200, 3, 4, 10}), 3);
		int expected = 2;
		assertThat(actual.size(), is(expected));
	}
	@Test
	public void testMap() {
		List<Integer> actual = Recursive.map(Arrays.asList(new Integer[]{1, 2, 3, 4, 5}), e -> e  * 2);
		assertThat(actual.get(0), is(2));
		assertThat(actual.get(1), is(4));
		assertThat(actual.get(2), is(6));
		assertThat(actual.get(3), is(8));
		assertThat(actual.get(4), is(10));
	}
	@Test
	public void testFilter() {
		List<Integer> actual = Recursive.filter(Arrays.asList(new Integer[]{1, 200, 3, 4, 10}), i -> i % 2 == 0);
		assertThat(actual.size(), is(3));
		assertThat(actual.get(0), is(200));
		assertThat(actual.get(1), is(4));
		assertThat(actual.get(2), is(10));
	}
}