validating - JUnit5

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The below examples use JUnit5.

In the simplest use of JUnit, we tag each method that represents a test with the @Test annotation. JUnit identifies these methods as individual tests and sets up and runs them one at a time, taking measures to avoid side effects between tests.

// validating/CountedList.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Keeps track of how many of itself are created.
package validating;

import java.util.*;

public class CountedList extends ArrayList<String> {
  private static int counter = 0;
  private int id = counter++;

  public CountedList() {
    System.out.println("CountedList #" + id);
  }

  public int getId() {
    return id;
  }
}

// validating/tests/CountedListTest.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Simple use of JUnit to test CountedList.
package validating;

import static org.junit.jupiter.api.Assertions.*;

import java.util.*;
import org.junit.jupiter.api.*;

public class CountedListTest {
  private CountedList list;

  @BeforeAll
  static void beforeAllMsg() { // static method
    System.out.println(">>> Starting CountedListTest");
  }

  @AfterAll
  static void afterAllMsg() { // static method
    System.out.println(">>> Finished CountedListTest");
  }

  @BeforeEach
  public void initialize() {
    list = new CountedList();
    System.out.println("Set up for " + list.getId());
    for (int i = 0; i < 3; i++) {
      list.add(Integer.toString(i));
    }
  }

  @AfterEach
  public void cleanup() {
    System.out.println("Cleaning up " + list.getId());
  }

  @Test
  public void insert() {
    System.out.println("Running testInsert()");
    assertEquals(list.size(), 3);
    list.add(1, "Insert");
    assertEquals(list.size(), 4);
    assertEquals(list.get(1), "Insert");
  }

  @Test
  public void replace() {
    System.out.println("Running testReplace()");
    assertEquals(list.size(), 3);
    list.set(1, "Replace");
    assertEquals(list.size(), 3);
    assertEquals(list.get(1), "Replace");
  }
  // A helper method to simplify the code. As
  // long as it's not annotated with @Test, it will
  // not be automatically executed by JUnit.
  private void compare(List<String> lst, String[] strs) {
    assertArrayEquals(lst.toArray(new String[0]), strs);
  }

  @Test
  public void order() {
    System.out.println("Running testOrder()");
    compare(list, new String[] {"0", "1", "2"});
  }

  @Test
  public void remove() {
    System.out.println("Running testRemove()");
    assertEquals(list.size(), 3);
    list.remove(1);
    assertEquals(list.size(), 2);
    compare(list, new String[] {"0", "2"});
  }

  @Test
  public void addAll() {
    System.out.println("Running testAddAll()");
    list.addAll(Arrays.asList(new String[] {"An", "African", "Swallow"}));
    assertEquals(list.size(), 6);
    compare(list, new String[] {"0", "1", "2", "An", "African", "Swallow"});
  }
}
/* Output:
>>> Starting CountedListTest
CountedList #0
Set up for 0
Running testRemove()
Cleaning up 0
CountedList #1
Set up for 1
Running testReplace()
Cleaning up 1
CountedList #2
Set up for 2
Running testAddAll()
Cleaning up 2
CountedList #3
Set up for 3
Running testInsert()
Cleaning up 3
CountedList #4
Set up for 4
Running testOrder()
Cleaning up 4
>>> Finished CountedListTest
*/

Re-run tests

Gradle will not re-run a task if the input and output hasn’t changed.
To rerun the tests, provide an extra argument or task if the test task is UP-TO-DATE

# Or force the tasks to be re-run # run the whole build
gradle --rerun-tasks test --tests *CountedListTestt
# Or clean the whole build before running the task
gradle clean test --tests *CountedListTest

 when not add --rerun-tasks or clean, we should change Test output string, so it will run the task.

references:

1. On Java 8 - Bruce Eckel

2. https://github.com/wangbingfeng/OnJava8-Examples/blob/master/validating/CountedList.java

3. https://github.com/wangbingfeng/OnJava8-Examples/blob/master/validating/tests/CountedListTest.java

4. https://blog.jdriven.com/2017/10/run-one-or-exclude-one-test-with-gradle/

5. https://github.com/madegroot/Run-or-Exclude-one-test-with-Gradle