### Question:
Grib1Customizer implements GribTables { public String getLevelUnits(int levelType) { VertCoordType lt = getLevelType(levelType); return lt.getUnits(); } protected  Grib1Customizer(int center, Grib1ParamTables tables); static Grib1Customizer factory(Grib1Record proto, Grib1ParamTables tables); static Grib1Customizer factory(int center, int subcenter, int version, Grib1ParamTables tables); static String getSubCenterNameStatic(int center, int subcenter); int getCenter(); Grib1Parameter getParameter(int center, int subcenter, int tableVersion, int param_number); @Override @Nullable String getGeneratingProcessName(int genProcess); @Override String getGeneratingProcessTypeName(int genProcess); @Nullable String getSubCenterName(int subcenter); @Override @Nullable String getSubCenterName(int center, int subcenter); Grib1ParamTime getParamTime(Grib1SectionProductDefinition pds); String getTimeTypeName(int timeRangeIndicator); @Override @Nullable GribStatType getStatType(int timeRangeIndicator); Grib1ParamLevel getParamLevel(Grib1SectionProductDefinition pds); @Override VertCoordType getVertUnit(int code); boolean isVerticalCoordinate(int levelType); @Override String getLevelNameShort(int levelType); String getLevelDescription(int levelType); boolean isLayer(int levelType); boolean isPositiveUp(int levelType); String getLevelUnits(int levelType); String getLevelDatum(int levelType); void setTimeUnitConverter(TimeUnitConverter timeUnitConverter); int convertTimeUnit(int timeUnit);  }### Answer:
@Test public void testStuff() { Grib1Customizer cust = new Grib1Customizer(0, null); String units = cust.getLevelUnits(110); assert units != null; }