@Test
public void testObjectsToRows() {

    DataFrame df = DataFrameBuilder
            .builder("a", "b")
            .objectsToRows(asList("a", "bc", "def"), s -> new Object[]{s, s.length()});
    new DataFrameAsserts(df, "a", "b").expectHeight(3)
            .expectRow(0, "a", 1)
            .expectRow(1, "bc", 2)
            .expectRow(2, "def", 3);
}