### Question:
NumberFunctions { public NumberFunctions(String val1){ this.val1 = val1; } NumberFunctions(String val1);  NumberFunctions(String val1, String val2);  NumberFunctions(String val1, String val2, String roundDigits); String add(); String subtract(); String multiply(); String divide(); String mod(); String roundUp(); String roundDown(); String roundClosest(); Method getNumberMethod(String value);  }### Answer:
@Test public void testNumberFunctions() { String val1 = "100"; String val2 = "50"; NumberFunctions numberFunctions = new NumberFunctions(val1,val2); Assert.assertNotNull(numberFunctions.add()); Assert.assertNotNull(numberFunctions.subtract()); Assert.assertNotNull(numberFunctions.divide()); Assert.assertNotNull(numberFunctions.mod()); Assert.assertNotNull(numberFunctions.multiply()); Assert.assertNotNull(numberFunctions.roundClosest()); Assert.assertNotNull(numberFunctions.roundDown()); Assert.assertNotNull(numberFunctions.roundUp()); }