@Test
public void convertEdgeLabelToColorTest() {

    IAtomContainer ac = makeBenzene(); // doesn't really matter
    AtomSignature atomSignature = new AtomSignature(0, ac);
    int aromaticColor = atomSignature.convertEdgeLabelToColor("p");
    Assert.assertTrue(aromaticColor > 0);
    int singleColor = atomSignature.convertEdgeLabelToColor("");
    int doubleColor = atomSignature.convertEdgeLabelToColor("=");
    int tripleColor = atomSignature.convertEdgeLabelToColor("#");
    Assert.assertTrue(singleColor < doubleColor);
    Assert.assertTrue(doubleColor < tripleColor);
}