### Question:
DCSeriesNumber { public String getNumber() { return ((number == null) ? "" : number); } DCSeriesNumber();  DCSeriesNumber(String value);  DCSeriesNumber(String s, String n); String toString(); String getSeries(); String getNumber();  }### Answer:
@Test public void testGetNumber() { dc = new DCSeriesNumber(null, null); assertThat("testGetNumber 0", dc.getNumber(), equalTo("")); dc = new DCSeriesNumber(null, "number"); assertThat("testGetNumber 1", dc.getNumber(), equalTo("number")); }