Testing Java code with JUnit

Junit Unit test Lab report first, the experimental environment

MyEclipse2014,Junit4.10

TwoExperimental Purpose

Learn unit tests and perform Junit tests in myeclipse

ThreeExperimental Steps1.write the class you want to test

The code is as follows:

Package com.cheng.test;

Public class Calculate {

Public int Add (int A,int b) {

return a+b;

}

Public int Sub (int A,int b) {

return a-2*b; Bug The calculation subtraction should be a-B;

}

Public int divide (int A,int b) {

return A/b;

}

Public int mul (int A,int b) {

return a*b;

}

}

2.add junit4.10.jar

After adding junit4-10 , the file directory is as follows:

3.new test class for testing previously written classes

The directory structure is as follows:

The test class code is as follows:

Package com.cheng.test;

Import static Org.junit.Assert. assertequals;

import Org.junit.Before;

import org.junit.Test;

Public class testcalculate {

Calculate Cal;

@Before

Public void setUp () {

Cal = new Calculate ();

}

@Test

Public void Testadd () {

assertequals  ("Additive Problem", 5,cal.add (2,3)); Test addition is correct

}

@Test

Public void testsub () {

assertequals ("Subtraction Problem", 8,cal.sub (10, 2));

}

@Test

Public void Testmul () {

assertequals ("Multiplication Problem", 20,cal.mul (10, 2));

}

@Test

Public void Testdiv () {

assertequals ("Problem with Division", 5,cal.divide (10, 2));

}

}

4.run junittest

Bundle test results to find the previous bug, modify the source code in the SRC folder, run junittest again

Add part Modified code :

Public int Sub (int A,int b) {

return A-B; Before is a-2*b; The calculation subtraction should be a-B;

}

Testing Java code with JUnit