src/test/java/au/id/zancanaro/javacheck/SimpleListOperationsTest.java


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package au.id.zancanaro.javacheck;

import au.id.zancanaro.javacheck.annotations.Property;
import au.id.zancanaro.javacheck.junit.Properties;
import org.junit.runner.RunWith;

import java.util.ArrayList;
import java.util.List;

import static java.util.Collections.reverse;
import static java.util.Collections.sort;
import static org.junit.Assert.assertEquals;

@RunWith(Properties.class)
public class SimpleListOperationsTest {

    @Property
    public void sortingIsIdempotent(List<Integer> list) {
        List<Integer> left = new ArrayList<>(list);
        sort(left);

        List<Integer> right = new ArrayList<>(list);
        sort(right);
        sort(right);

        assertEquals(left, right);
    }

    @Property
    public void reverseIsInvolution(List<String> list) {
        List<String> newList = new ArrayList<>(list);
        reverse(newList);
        reverse(newList);

        assertEquals(list, newList);
    }
}