目录

Preparation

Task

Requirements

Tips:

Junit Test

Junit assert

Junit time test

Junit parameterized test

Junit Exception Test

Junit Suite Test

Preparation

Learn related knowledge about Junit Test for Java and Unittest for python. You can finish the following assignment or test Your Project.

Task

1. Here are Junit Test task and Unittest task for choose. If you are good at Java , we suggest you choose the first one, if you are good at Python, then, the latter one.
2. Follow the requests and tips, complete the test task .

Requirements

1. You should be familiar with Junit Test or Unittest and the usage of these tools.Such as ‘assert, suite, timeout’, check problems for detail.
2. Fix the missing codes according to requirement for every problem.

Tips:

@Parameters：Add this annotation to every method if it provide data. By the way, these methods must be static, return a Collection and receive no parameter. 

P.S.: You must assign value for every field in the class no matter used or unused!

In Junit, you can use @RunWith and @parameter to pass parameters.

@RunWith：When a class annotated by @RunWith or when a class extends a base class which annotated by @RunWith，then Junit will run test through a runner pointed by the annotation.

• We list ‘related knowledge’ for some problems, read it very carefully.

  Junit Test

• Junit assert

• Related Knowledge： you can check the expected result and the real result of the method you test with the help of org.junit.Assert.

• 

• task：given a assert test class, complete assert test code

• import static org.junit.Assert.*;
  import org.junit.Test;
  
  public class AssertionsTest {
  	String obj1 = "junit";
  	String obj2 = "junit";
  	String obj3 = "test";
  	String obj4 = "test";
  	String obj5 = null;
  	int var1 = 1;
  	int var2 = 2;
  	int[] arithmetic1 = { 1, 2, 3 };
  	int[] arithmetic2 = { 1, 2, 3 };
  
  	@Test
  	public void test() {
  		// add assert test code between Begin and End, no other change allowed 
  		/***********************Begin**************************/
          //assertTrue(var1 < var2); for example
          
          assertEquals(“obj1不等于obj2”,obj1,obj2);
          System.out.println(“obj1等于obj2”);
          
          assertTrue(“var1 小于 var2 是”,var1<var2);
          System.out.println(“var1 小于 var2 ”);
  
          assertFalse(“var1 大于 var2 是”);
          System.out.println(“var1 大于 var2 ” 错误);
  
          assertNotNull(obj3);
          System.out.println("object 不是 not null ");
  
          assertNull(obj5);
          System.out.println("obj5 is null");
  
          assertArrayEquals(arithmetic1,arithmetic2);
          System.out.println("arithmetic1 is equal to arithmetic2");
  
  
  		/************************End***************************/
      }
  }

   

• Junit time test

• if a test case takes longer time you set, then Junit will mark it failed. 

  tip: use ‘timeout’ and ‘@Test’ togeter

• import org.junit.Test;
  
  public class TestTimeOut {
  
       // Fix timeout assert in Test function below. Test fail if running 1000ms longer
      /***********************Begin**************************/
      @Test(timeout = 1000)
      public void test() {
          while(true){}
      }
      /************************End***************************/
  }

   

• Junit parameterized test

• Related knowledge：Junit parameterized test allows you test the same test with different parameters. Learning Junit parameterized test with five steps bellow.

• Annotate test class with @RunWith(Parameterized.class).
• Build a static method annotated by @Parameters, which retrun a set or an array of Objects as test data.
• Build a public construct method, which receives a parameter equals with test data.
• Build instance variable for every colum of test data.
• Build your test case with the instance as test data source.

• In Junit, you can use @RunWith and @parameter to pass parameters.

  @RunWith：When a class annotated by @RunWith or when a class extends a base class which annotated by @RunWith，then Junit will run test through a runner pointed by the annotation.

  @Parameters：Add this annotation to every method if it provide data. By the way, these methods must be static, return a Collection and receive no parameter. 

  P.S.: You must assign value for every field in the class no matter used or unused!

• import static org.junit.Assert.assertEquals; // static import
  import java.util.Arrays;
  import java.util.Collection;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.Parameterized;
  import org.junit.runners.Parameterized.Parameters;
  import step1.Calculator;
  /**
   * JUnit4 parameterized test
   */
  @RunWith(Parameterized.class)
  public class ParameterTest {
      private int input11;
      private int input22;
      private int expected;
      public ParameterTest(int input11, int input22, int expected){
          this.input11 = input11;
          this.input22 = input22;
          this.expected = expected;
      }
      @Parameters
      public static Collection prepareData(){
          /**
           *the type of the two-dimension array must be Object.
           *data in the two-dimension array is ready of test sub() in Calculator
           * every element in the two-dimension array should corresponds to position of parameters in construct method ParameterTest
           *let the third element equals the first subtract the second element according to parameters’ postion
           *fix missing codes under ‘Begin’ and above ‘End’，pass 4 groups of parameters to test sub method in Calculator is right or not 
           *tip：only two lines of codes  
          */
          /*********************************Begin****************************************/
          return Arrays.asList(new.Object[][]);   
          new.Object[][] = { {1,1,1} , { 3,1,2},{2,2,2},{2,1,1}};
          /**********************************End****************************************/
      }
  @Test
   public void testSub(){
          Calculator cal = new Calculator();
          assertEquals(cal.sub(input11, input22), expected);
      }
  }
  
  // Calculator.java Junit Parameterized Test
  /** 
   * Mathematical Calculation  subtract
   */  
  public class Calculator {  
      public int sub(int a, int b) {  
          return a - b;  
      }  
  }

   

• Junit Exception Test

• Related knowledge：you can check codes if throw expected exception or not by using ‘expected’ attribute in @Test meta data. value of the ‘expected attribute’ is a kind of Exception, if codes throw the expected exception, then test successfully, otherwise, failed.

• import static org.junit.Assert.*;
  
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import step2.Person;
  
  
  public class JunitException {
  
      /**
  *add a line of annotation in Begin/End，check the age of Person Object is legal or not.     *throw IllegalArgumentException exception
      */
      /***********************************Begin***********************************/
      @Test(expected=IllegalArgumentException.class)  
      /************************************End************************************/
      public void checkage() {
      Person person = new Person();
      person.setAge(-1);
      }
  }
  
  //Person.java
  public class Person {
          private String name;
          private int age;
          public String getName() {
          return name;
          }
          public void setName(String name) {
          this.name = name;
          }
          public int getAge() {
          return age;
          }
          public void setAge(int age) {
          if (age < 0 ) {
          throw new IllegalArgumentException("age is invalid");
          }
      this.age = age;
      }
  }

   

• Junit Suite Test

• Related knowledge：Suite Test means test a couple of test cases together. Precisely speaking, Using @RunWith and @Suite.

• import static org.junit.Assert.*;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.Suite;
  import step3.Calculate;
  import step3.CalculateTest;
  import step3.Car;
  import step3.CarTest;
  
  /*
  add two lines of annotations. Implement Suite Test of CalculateTest and CarTest
  Suite Test codes must next to Class SuiteTest, no shift allowed!
  */
  //**************************************************************
  @RunWith(Suite.class)
  @Suite.SuiteClasses({ CalculateTest.class, CarTest.class})
  public class SuiteTest {
      @Test
      public void testPrint() {
          System.out.println("The result of CalculateTest");
  assertEquals(24, result);
  System.out.println("The result of CarTest");
  assertEquals(4, result);
      }
  }
  
  //Calculate.java
  public class Calculate {
      public int add(int a, int b) {
          return a + b;
      }
  }
  
  //CalculateTest.java
  public class CalculateTest {
      Calculate calculate;
      @Before
      public void setUp() throws Exception {
          calculate = new Calculate();
      }
      @Test
      public void testAdd() {
          int result = calculate.add(12, 12);
          assertEquals(24, result);
  }
  }
  
  //CarTest.java
  public class CarTest {
      Car car;
      @Before
      public void setUp() throws Exception {
          car = new Car();
      }
      @Test
      public void testGetWheels() {
          int result = car.getWheels();
          assertEquals(4, result);
      }
  }
  
  //Car.java
  public class Car {
      public int getWheels() {
          return 4;
      }
  }