### Question:
CTCSubFieldPackager extends ISOBaseValidatingPackager { public ISOComponent validate( ISOComponent c ) throws org.jpos.iso.ISOException { LogEvent evt = new LogEvent( this, "validate" ); try { Map tab = c.getChildren(); for ( int i = 0; i < fldVld.length; i++ ) { ISOField f = (ISOField) tab.get (i); if ( f != null ) c.set( fldVld[i].validate( f ) ); } return c; } catch ( ISOVException ex ) { if ( !ex.treated() ) { c.set( ex.getErrComponent() ); ex.setTreated( true ); } evt.addMessage( ex ); throw ex; } finally { Logger.log( evt ); } } CTCSubFieldPackager(); byte[] pack( ISOComponent c ); int unpack( ISOComponent m, byte[] b ); ISOComponent validate( ISOComponent c );  }### Answer:
@Test public void testValidateThrowsNullPointerException1() throws Throwable { assertThrows(NullPointerException.class, () -> { new CTCSubFieldPackager().validate(null); }); }
@Test public void testValidateThrowsNullPointerException2() throws Throwable { assertThrows(NullPointerException.class, () -> { new CTCSubFieldPackager().validate(new ISOMsg()); }); }
@Test public void testValidateThrowsNullPointerException3() throws Throwable { assertThrows(NullPointerException.class, () -> { CTCSubFieldPackager cTCSubFieldPackager = new CTCSubFieldPackager(); cTCSubFieldPackager.setLogger(Logger.getLogger(""), "testCTCSubFieldPackagerRealm"); ISOValidator[] fvlds = new ISOValidator[2]; cTCSubFieldPackager.setFieldValidator(fvlds); cTCSubFieldPackager.validate(new ISOMsg("testCTCSubFieldPackagerMti")); }); }