First step of using junit---------Software Testing Lab 1---2016.03.18

1. Install junit

a)      Download “junit.jar”

b)      In eclipse, Windows->Preferences->Java->Build Path->Classpath variables->New,

add  "junit.jar" file.

　　　　

2. Install hamcrest

a)      Download “hamcrest.jar”

b)      In eclipse, Windows->Preferences->Java->Build Path->Classpath variables->New,

add the downloaded jar file.

　　　　

3. Install eclemma

a)      In eclipse, Help->Eclipse Marketplace, find eclemma in the market and install it

　　　　 

4. Build a new project

a)      Build a new project named “TestingLab1”

b)      Create a new class under “src” to write our source code---TestingLab1/src/cn/tju/st/Cal.java

c)      Create a new folder under this project to write the testing code---TestingLab1/test/cn/tju.st/test/Testing.java

d)      Import “junit.jar” and “hamrcrest” to the project.

i.          Click the right mouse button at the project and select “Propertise”.

ii.          Propertise->Java Build Path->Add Variables

iii.          Select “junit” and “hamrcrest”and click “OK”

　　　　　　　　　　　　　　　　 

5. Write the source code in Cal.java

package cn.tju.st;
public class Cal{
    //calculate the triangle's type
    public int triangle(int a, int b, int c){
        if(a == b || b ==c || c == a){
            if(a == b)
                return 0; //equilateral
            else
                return 1; //isosceles
        }
        return 2; //scalene
    }
}

6. Write the test code in Testing.java

a)      Use org.junit.Assert.assertEquals to test the source code with an expected result.

b)      Write “@Test” before the test function

package cn.tju.st.test;

import cn.tju.st.Cal;
import org.junit.*;
import static org.junit.Assert.*;

public class Testing{
    @Test
    public void testEquilateral(){
        assertEquals(0, new Cal().triangle(2, 2, 2));
    }

    @Test
    public void testIsosceles(){
        assertEquals(1, new Cal().triangle(1, 2, 2));
        assertEquals(1, new Cal().triangle(2, 1, 2));
    }

    @Test
    public void testScalene(){
        assertEquals(2, new Cal().triangle(2, 3, 4));
    }
}

7. Testing the source

a)      Click the right mouse button at the project and select “Coverage->Junit Test”

　　　　

8. Results

a)      When the code is executed, it becomes green

b)      When the code is not executed, it becomes red

c)      When the code is executed partly, it becomes yellow

d)      When we test by “testEquilateral()”,

@Test
    public void testEquilateral(){
        assertEquals(0, new Cal().triangle(2, 2, 2));
    }

　　In "Cal.java"

　　i)      the first“if” just execute “a==b”, it becomes yellow.

　　j)      the second “if” execute “a==b” and then “return ture”, but it doesn’t execute the other case(a !=b), it becomes yellow. If and only if 　　　　　　 the“if”executes all the conditions(when it’s ture and when it’s false), it becomes green.

　　k)     the others becomes red because of no executing

　　　

　　l)      now you can see the coverage and it is not all 100%

　　　　　　

e)      When we test by “testEquilateral()” and “testIsosceles()” at the same time,

the second “if” executes “a==b”, get the true and false with different test case, the it becomes green.

　　

f)      When we test all 3 functions, the code becomes green, because all conditions have been concerned.

　　

　　　　and now you can see the coverage all 100%.

　　

sourcecode link: https://github.com/xuexcy/SoftwareTestingLab1