IllegalAccessErrorTest.java

/*                        __    __  __  __    __  ___
 *                       \  \  /  /    \  \  /  /  __/
 *                        \  \/  /  /\  \  \/  /  /
 *                         \____/__/  \__\____/__/.ɪᴏ
 * ᶜᵒᵖʸʳᶦᵍʰᵗ ᵇʸ ᵛᵃᵛʳ ⁻ ˡᶦᶜᵉⁿˢᵉᵈ ᵘⁿᵈᵉʳ ᵗʰᵉ ᵃᵖᵃᶜʰᵉ ˡᶦᶜᵉⁿˢᵉ ᵛᵉʳˢᶦᵒⁿ ᵗʷᵒ ᵈᵒᵗ ᶻᵉʳᵒ
 */
package outside_of_vavr;

import io.vavr.collection.Array;
import io.vavr.collection.BitSet;
import io.vavr.collection.HashMap;
import io.vavr.collection.List;
import org.junit.Test;

import java.util.function.BiFunction;

import static org.assertj.core.api.Assertions.assertThat;

public class IllegalAccessErrorTest {

    @Test
    public void shouldNotThrowIllegalAccessErrorWhenUsingHashMapMergeMethodReference() {
        final BiFunction<HashMap<String, String>, HashMap<String, String>, HashMap<String, String>> merge = HashMap::merge;
        final HashMap<String, String> reduced = Array.of("a", "b", "c")
                .map(t -> HashMap.of(t, t))
                .reduce(merge);
        assertThat(reduced).isEqualTo(HashMap.of("a", "a", "b", "b", "c", "c"));
    }

    @Test
    public void shouldNotThrowIllegalAccessErrorWhenUsingBitSetAddAllMethodReference() {
        final BiFunction<BitSet<Integer>, BitSet<Integer>, BitSet<Integer>> union = BitSet::union;
        final BitSet<Integer> reduced = List.of(BitSet.of(1, 2, 3), BitSet.of(2, 3, 4)).reduce(union);
        assertThat(reduced).isEqualTo(BitSet.of(1, 2, 3, 4));
    }
}