@Test public void testGetInwardConnectedness() { int[][] network = new int[][] { {0, 8, 1, 0}, {4, 0, 2, 8}, {0, 0, 0, 0}, {1, 0, 8, 0} }; Network net = new Network(network); // the type of these should be double[], but my current version of JUnit doesn't allow that... double[][] trueValue = new double[][] {{0, 0, 4, 0}}; assertArrayEquals(trueValue, new double[][] {net.getVertexInwardConnectedness()}); }