src/test/ReachabilityTest.java


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import org.junit.jupiter.api.Test;

import java.util.ArrayList;

import static org.junit.jupiter.api.Assertions.*;

class ReachabilityTest {

    @Test
    void test() {
        ArrayList<ArrayList<Integer>> adj = new ArrayList<>();
        for (int i = 0; i < 4; i++) {
            adj.add(new ArrayList<>());
        }

        adj.get(0).add(1);
        adj.get(2).add(1);
        adj.get(3).add(2);
        adj.get(0).add(3);

        assertEquals(1, Reachability.reach(adj, 0, 3));
    }

    @Test
    void test1() {
        ArrayList<ArrayList<Integer>> adj = new ArrayList<>();
        for (int i = 0; i < 4; i++) {
            adj.add(new ArrayList<>());
        }

        adj.get(0).add(1);

        adj.get(2).add(1);

        assertEquals(0, Reachability.reach(adj, 0, 3));
    }

}