@Test public void singleType() {

    Atom a = Mockito.mock(Atom.class);
    Atom b = Mockito.mock(Atom.class);
    Mockito.when(a.aromatic()).thenReturn(true);
    Mockito.when(b.aromatic()).thenReturn(false);
    Assert.assertThat(ImplicitToExplicit.type(a, b), CoreMatchers
            .is(Bond.SINGLE));
    Mockito.when(a.aromatic()).thenReturn(false);
    Mockito.when(b.aromatic()).thenReturn(true);
    Assert.assertThat(ImplicitToExplicit.type(a, b), CoreMatchers
            .is(Bond.SINGLE));
    Mockito.when(a.aromatic()).thenReturn(false);
    Mockito.when(b.aromatic()).thenReturn(false);
    Assert.assertThat(ImplicitToExplicit.type(a, b), CoreMatchers
            .is(Bond.SINGLE));
}