SomeUncheckedException sue = new SomeUncheckedException();
    IllegalArgumentException iae = new IllegalArgumentException(sue);
    RuntimeException re = new RuntimeException(iae);
    IllegalStateException ex = new IllegalStateException(re);

    assertThat(getCausalChain(ex)).containsExactly(ex, re, iae, sue).inOrder();
    assertThat(Iterables.getOnlyElement(getCausalChain(sue))).isSameInstanceAs(sue);

    SomeUncheckedException sue = new SomeUncheckedException();
    IllegalArgumentException iae = new IllegalArgumentException(sue);
    RuntimeException re = new RuntimeException(iae);
    IllegalStateException ex = new IllegalStateException(re);

    assertThat(getCausalChain(ex)).containsExactly(ex, re, iae, sue).inOrder();
    assertThat(Iterables.getOnlyElement(getCausalChain(sue))).isSameInstanceAs(sue);

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