@Test
public void fillMissing_defaultValue() {

  DoubleColumn col1 =
      DoubleColumn.create(
          "col1",
          new double[] {
            0.0,
            1.0,
            DoubleColumnType.missingValueIndicator(),
            2.0,
            DoubleColumnType.missingValueIndicator()
          });
  DoubleColumn expected = DoubleColumn.create("expected", new double[] {0.0, 1.0, 7.0, 2.0, 7.0});
  assertArrayEquals(expected.asDoubleArray(), col1.set(isMissing, 7.0).asDoubleArray(), 0.0001);
}