### Question:
AdditionTransformFunction extends BaseTransformFunction { @Override public String getName() { return FUNCTION_NAME; }  @Override String getName(); @Override void init(List<TransformFunction> arguments, Map<String, DataSource> dataSourceMap); @Override TransformResultMetadata getResultMetadata(); @Override double[] transformToDoubleValuesSV(ProjectionBlock projectionBlock); static final String FUNCTION_NAME; }### Answer:
@Test public void testAdditionTransformFunction() { ExpressionContext expression = QueryContextConverterUtils.getExpression(String .format("add(%s,%s,%s,%s,%s)", INT_SV_COLUMN, LONG_SV_COLUMN, FLOAT_SV_COLUMN, DOUBLE_SV_COLUMN, STRING_SV_COLUMN)); TransformFunction transformFunction = TransformFunctionFactory.get(expression, _dataSourceMap); Assert.assertTrue(transformFunction instanceof AdditionTransformFunction); Assert.assertEquals(transformFunction.getName(), AdditionTransformFunction.FUNCTION_NAME); double[] expectedValues = new double[NUM_ROWS]; for (int i = 0; i < NUM_ROWS; i++) { expectedValues[i] = (double) _intSVValues[i] + (double) _longSVValues[i] + (double) _floatSVValues[i] + _doubleSVValues[i] + Double.parseDouble(_stringSVValues[i]); } testTransformFunction(transformFunction, expectedValues); expression = QueryContextConverterUtils.getExpression(String .format("add(add(12,%s),%s,add(add(%s,%s),0.34,%s),%s)", STRING_SV_COLUMN, DOUBLE_SV_COLUMN, FLOAT_SV_COLUMN, LONG_SV_COLUMN, INT_SV_COLUMN, DOUBLE_SV_COLUMN)); transformFunction = TransformFunctionFactory.get(expression, _dataSourceMap); Assert.assertTrue(transformFunction instanceof AdditionTransformFunction); for (int i = 0; i < NUM_ROWS; i++) { expectedValues[i] = ((12d + Double.parseDouble(_stringSVValues[i])) + _doubleSVValues[i] + ( ((double) _floatSVValues[i] + (double) _longSVValues[i]) + 0.34 + (double) _intSVValues[i]) + _doubleSVValues[i]); } }