@Test
public void testExpectRows_Mismatch() {

    DataFrame df = DataFrame.newFrame("a").foldByRow("a", "b");
    try {
        new DataFrameAsserts(df, "a")
                .expectRow(0, "a")
                .expectRow(1, "c");
        throw new RuntimeException("Must have failed comparision");
    } catch (AssertionFailedError f) {
        assertEquals("c", f.getExpected().getValue());
        assertEquals("b", f.getActual().getValue());
    }
}