1. Create a Calculator.java class. Create following 4 static methods(with return type float): Add(), Subtract(), Multiply() and Divide() Each of the above methods should take two arguments and return the final result after the operation. 2. Create a test class now with a name CalculatorTest.java. In this class perform the following steps: Import the following libraries at the top of this file: import org.JUnit.Before; import org.JUnit.Test; import static org.JUnit.Assert.assertEquals; 3. Create the object of Calculator.java class by writing the following code in CalculatorTest.java class. privateCalculator calculator; @Before publicvoidsetUp() { this.calculator = newCalculator(); } 4. Now, generate the JUnit test classes for all the methods one by one. Declare and initialize the two variables to pass those to the 4 methods. Store the expected result in one of the variables and then compare it with the actual returned value of the specific function. 5. After creating 4 JUnit test cases for addition, subtraction, multiplication, and division, run all the test cases one by one. Check the output. All the test cases should be passed at the end.