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


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package au.id.zancanaro;

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

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

import static au.id.zancanaro.Generators.integer;
import static au.id.zancanaro.Generators.listOf;
import static org.junit.Assert.assertEquals;

@RunWith(Properties.class)
public class SimpleListOperationsTest {

    @DataSource
    public static Generator<List<Integer>> listOfIntegers = listOf(integer());

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

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

        assertEquals(left, right);
    }

    @Property(maxSize = 10000, runs = 10000)
    public void reverseIsItsOwnInverse(List<Integer> list) {
        List<Integer> reversed = new ArrayList<>(list);
        Collections.reverse(reversed);
        Collections.reverse(reversed);

        assertEquals(list, reversed);
    }
}