### Question:
ElevationToSolzen extends Rule { @Override public Item apply(Item sourceColumn) throws RuleException { return sourceColumn; }  @Override Item apply(Item sourceColumn); @Override Array apply(Array sourceArray, Item sourceColumn);  }### Answer:
@Test public void testApply() throws Exception { ElevationToSolzen rule = new ElevationToSolzen(); Array sourceArray = Array.factory(new float[]{12.0f, 27.123f}); Array targetArray = rule.apply(sourceArray, new ColumnBuilder() .type(DataType.FLOAT) .build()); assertEquals(78.0f, targetArray.getFloat(0), 0.0); assertEquals(62.877f, targetArray.getFloat(1), 0.0); }