Boot software development

Roman Number

Roman numerals have seven symbols. The table below shows these symbols and their decimal equivalents.

Symbol	Number
I	1
V	5
X	10
L	50
C	100
D	500
M	1,000

Negative Numbers and Range

We cannot represent negative numbers using Roman Numbers. The largest number you can write in Roman numerals is 3,999 which is MMMCMXCIX Numbers larger than 3,999 in Roman numerals is represented using an overline. An overline on a Roman numeral means we are multiplying that Roman numeral by 1,000. For the number 50,000 in Roman numerals, you would use the Roman numeral L (50) with an overline to make it 50,000

Conversion Rules

I can be placed before V or X, represents subtract one, so IV (5-1) = 4 and 9 is IX (10-1)=9.

X can be placed before L or C represents subtract ten, so XL (50-10) = 40 and XC (100-10)=90.

C placed before D or M represents subtract hundred, so CD (500-100)=400 and CM (1000-100)=900. Roman numerals are usually written in highest to lowest from left to right except for some special cases where the left character is less than the right character.

Implementation

The algorithm is simple

1) Place the roman literals in an array

2) Place corresponding integer values (numbers) in another array maintaining the corresponding indices.

3) Try subtracting the biggest number from the numbers array from the input value until the input is 0.

4) Append the corresponding roman literal to output String.

ToRoman.java

The following class defines a method that accepts an integer and returns a Roman Number in the form of a String object.

 /**
   * I can be placed before V or X
   * 
   * X can be placed before L or C
   * 
   * C can be placed before D or M
   * 
   * 
   */
  public static String convertToRomanNumber(int num) {

    int number[] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
    String roman[] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};

    StringBuilder result = new StringBuilder();
    for (int i = 0; i < number.length; i++) {
      while (num >= number[i]) {
          num = num - number[i];
          result = result.append(roman[i]);
      }
    }

    return result.toString();
  }

Console

System.out.println("Integer 4 : Roman " + RomanNumbers.convertToRomanNumber(4)); System.out.println("Integer 100 : Roman " + RomanNumbers.convertToRomanNumber(100)); System.out.println("Integer 2000 : Roman " + RomanNumbers.convertToRomanNumber(2000)); System.out.println("Integer 3,999 : Roman " + RomanNumbers.convertToRomanNumber(3999)); Integer 4 : Roman IV Integer 100 : Roman C Integer 2000 : Roman MM Integer 3,999 : Roman MMMCMXCIX

References

Convert Online From Integer to Roman

Java Threads Print Alternative Odd Even Numbers

This article shows how to print Even and Odd numbers alternatively using Java. It uses Two Java threads and a Class with two methods to print even numbers and odd numbers respectively.

What we are trying to achieve

We want to print even and odd numbers alternatively but using two threads. Essentially it is the interaction between two threads utilizing the wait() and notify() methods. One thread completes a task (printing a single even number) then it is put on wait state so that the other thread can get a chance to do its job (printing odd number) and this goes on until we are done with printing a set of numbers determined by max.

How it will work

Print Class (Print.java) with two synchronized methods even() and odd() which print even or odd numbers respectively.
Each method is synchronized so that two threads cannot execute them concurrently.
Each method first calls notifyAll() to so that other threads that are waiting can be wake up.
It then prints a number (even or odd) and then calls the wait() method on the current thread so it goes to waiting state.

Java Code

Print.java

This Class essentially has two synchronized methods. The constructor of this class takes a max number as a parameter. This max number is the limit to which the numbers will be printed. It has two synchronized methods to print even and odd numbers alternatively.

class Print {
  int max;

  public Print(int max) {
    this.max = max;
  }

  public synchronized void even() throws InterruptedException {
    for (int i = 0; i <= max; i++) {
      notifyAll();
      if (i % 2 == 0)
        System.out.println(Thread.currentThread().getName() + ":: " + i);
      wait();
    }
  }

  public synchronized void odd() throws InterruptedException {
    for (int i = 0; i <= max; i++) {
      notifyAll();
      if (i % 2 != 0)
        System.out.println(Thread.currentThread().getName() + ":: " + i);
      wait();
    }
  }
}

Threads.java

Here we are creating an instance of Print class and creating two Threads. From the first thread, we are calling print.even() method, from the second thread we are calling print.odd() method.

Print print = new Print(10);

//Thread to print even numbers
Thread t1 = new Thread(new Runnable() {
  @Override
  public void run() {
    try {
      print.even();
    } catch (InterruptedException e) {
    }
  }
});

//Thread to print odd numbers
Thread t2 = new Thread(new Runnable() {
  @Override
  public void run() {
    try {
      print.odd();
    } catch (InterruptedException e) {
    }
  }
});

t1.setName("Even Thread");
t2.setName(" Odd Thread");

t1.start();
t2.start();

Console Output

Even Thread:: 0
Odd Thread:: 1
Even Thread:: 2
Odd Thread:: 3
Even Thread:: 4
Odd Thread:: 5
Even Thread:: 6
Odd Thread:: 7
Even Thread:: 8
Odd Thread:: 9
Even Thread:: 10

Conclusion

From the odd() or even () method we have to first call notify or notifyAll() first.
Both odd() or even() method should be synchronized otherwise calling notifyAll() or wait() will throw exception

Java Thread States

A thread in Java at any point of time exists in any one of the 6 states. This article give a quick introduction of different Thread states and respective methods which results in threads state change.

Following are the states of a Java Thread

New: Thre thread is just created by using start() method on the tread
Runnable: Thread state for a runnable thread. A thread in the runnable state is executing in the Java virtual machine but it may be waiting for other resources from the operating system such as a processor.
Blocked: A thread in the blocked state is waiting for a monitor lock
Waiting: A thread is in the waiting state due to calling one of the following methods:
Object.wait() with no timeout
Thread.join() with no timeout
LockSupport.park
Timed Waiting: A thread is in the timed waiting state due to calling one of the following methods with a specified positive waiting time:Thread.sleep (long)
Object.wait (long)
Thread.join (long)
LockSupport.parkNanos
LockSupport.parkUntil
Terminated: The thread has completed execution

Matrix Rotation in Java

In this article, we will explore a few different ways to rotate a matrix clock by 90 degrees.

Rotating Matrix to 90 Clockwise

Following is our Matrix.

[ 1 2 3 ]

[ 4 5 6 ]

[ 7 8 9 ]

We will explore multiple ways to rotate this matrix clockwise 90

With Matrix Transpose

Matrix transpose is a flipped version of the matrix along its diagonal. In short, it is the same as interchanging the rows with columns. For the above matrix the transposed matrix will look like.

[ 1 4 7 ]

[ 2 5 8 ]

[ 3 6 9 ]

Also, the transposed matrix is equivalent to 90 Left rotation of the original array.

RoateMatrixWithTranspose

Here the Rotation of the matrix is done in two steps
1) We transpose the matrix 2) And we interchange the columns

public void rotateMatrixRight90Transpose(int[][] mat) {

    int m = mat.length;
    int n = mat[0].length;

    for (int i = 0; i < m; i++) {
      for (int j = i; j < n; j++) {
        int x = mat[i][j];
        mat[i][j] = mat[j][i];
        mat[j][i] = x;
        System.out.println("IC" + i + ":" + j);
      }
    }

    // swap cols
    for (int i = 0; i < m; i++) {
      for (int j = 0; j < n / 2; j++) {
        // swap mat[i][j] with mat[N-i-1][j]
        int temp = mat[i][j];
        mat[i][j] = mat[i][n - j - 1];
        mat[i][n - j - 1] = temp;
      }
    }
  }

Output

Matrix Rotation with Transpose

<= Original Matrix =>

[ 1 2 3 ]

[ 4 5 6 ]

[ 7 8 9 ]

<= After Transpose =>

[ 1 4 7 ]

[ 2 5 8 ]

[ 3 6 9 ]

<= After Rotation =>

[ 7 4 1 ]

[ 8 5 2 ]

[ 9 6 3 ]

Matrix Rotation in Single pass

MatrixRotation.java

The following code will rotate the matrix in a single pass.

public void rotate(int[][] matrix) {
    int n = matrix.length;
    for (int i = 0; i < (n + 1) / 2; i++) {
      for (int j = 0; j < n / 2; j++) {
        int temp = matrix[n - 1 - j][i];
        matrix[n - 1 - j][i] = matrix[n - 1 - i][n - j - 1];
        matrix[n - 1 - i][n - j - 1] = matrix[j][n - 1 - i];
        matrix[j][n - 1 - i] = matrix[i][j];
        matrix[i][j] = temp;
      }
    }
  }

Output

Matrix Rotation with single pass

<= Original Matrix =>

[ 1 2 3 ]

[ 4 5 6 ]

[ 7 8 9 ]

<= After Rotation =>

[ 7 4 1 ]

[ 8 5 2 ]

[ 9 6 3 ]

Eclipse Google Java Style Guide

This article shows how to use the Google Java style with Eclipse IDE. Every organization has its own style guide, in the open-source community different projects have a slightly different style guide. In this article, we will see how to use the official google style guide in Eclipse IDE.

Get the Style Guide

Save the style guide which is a XML file to your local drive.

Eclipse Google Style Guide.

Open Eclipse Preference

Opening Eclipse settings varies per OS. For example, on macOS open Eclipse -> Preferences.

Add the Google Style formatter to Eclipse

Import the downloaded XML file.

Configure save actions to automatically format code while saving files.

In the Preferences menu type “save actions”, and select Java -> Editor -> Save Actions.

JUnit 5 Tutorial : Display name

In JUnit 5, we can use @DisplayName to declare custom display names for test classes and test methods.

Display Name Example

package com.bootng.display;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

public class DisplayCustomNameTest {

	@Test
	public void test_if_it_will_rain() {
	}

	@Test
	public void test_if_it_will_be_cloudy() {
	}

	@Test
	public void test_if_it_will_be_sunny() {
	}

}

Output

Display CustomName Example

package com.bootng.display;
@DisplayName("Vacation Weather Test")
public class DisplayCustNameTest {
	@DisplayName("🌧")
	@Test
	public void test_if_it_will_rain() {
	}

	@DisplayName("🌨")
	@Test
	public void test_if_it_will_be_cloudy() {
	}

	@DisplayName("🌞")
	@Test
	public void test_if_it_will_be_sunny() {
	}
}

Output

Custom Name Generator Example

We can also use a Custom Name generator to generate the test names. As of Version 5.4 it comes with the following generators out of the box.

DisplayNameGenerator.IndicativeSentences

DisplayNameGenerator.ReplaceUnderscores

DisplayNameGenerator.Simple

DisplayNameGenerator.Standard

Each of the above generators has different implementations of how to generate test name.

In the Following example we are using ReplaceUnderscores. As a result the test names will be generated by replacing the "_" from respective names.

package com.bootng.display;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

@DisplayName("Weather Test DisplayExample ")
@DisplayNameGeneration(DisplayNameGenerator.ReplaceUnderscores.class)
public class DisplayGeneratorExampleTest {

	@Test
	public void test_if_it_will_rain() {
	}

	@Test
	public void test_if_it_will_be_cloudy() {
	}

	@Test
	public void test_if_it_will_be_sunny() {
	}
}

Output

JUnit5 Important Annotations

Junit 5 comes with some new annotations that were not available in previous releases. Understanding these Annotations will help in writing efficient tests. This article covers some of the most commonly used annotations. In the next section, we will example of those annotations.

The following are some of the important annotations in JUnit 5.

@Test

@Test : Denotes that a method is a test method. Without this annotation, JUnit will ignore the method

@ParameterizedTest

Denotes a method to be a parameterized test method. Parameterized tests make it possible to run a test multiple times with different arguments.

@RepeatedTest

@RepeatedTest : Test methods marked with @RepeatedTest can be executed repeatedly

@TestMethodOrder

@TestMethodOrder: Helps maintain order in which test methods are executed.

@DisplayName

@DisplayName : Helps in using a custom name to be printed either in the console or test report for the test method.

@DisplayNameGeneration

@DisplayNameGeneration : Declares a custom display name generator for the test class

@BeforeEach

@BeforeEach: Analogous to JUnit 4 @Before. Denotes the annotated method should be executed before each test. The method should not return any value, should not be private.

@AfterEach

@AfterEach : Analogous to JUnit 4 @After. Denotes the annotated method should be executed after each test. The method should not return any value, should not be private.

@BeforeAll

@BeforeAll: Denotes that the annotated method should be executed before all @Test, @RepeatedTest, @ParameterizedTest, and @TestFactory methods in the current class; analogous to JUnit 4’s @BeforeClass. Such methods are inherited (unless they are hidden or overridden) and must be static (unless the "per-class" test instance lifecycle is used).

@AfterAll

@AfterAll: Denotes that the annotated method should be executed after all @Test, @RepeatedTest, @ParameterizedTest, and @TestFactory methods in the current class; analogous to JUnit 4’s @AfterClass. A method marked with @AfterAll is inherited (unless they are hidden or overridden) and must be static.

@Nested

@Nested:Denotes that the annotated class is a non-static nested test class. @BeforeAll and @AfterAll methods cannot be used directly in a @Nested test class unless the "per-class" test instance lifecycle is used. Such annotations are not inherited.

@Tag

@Tag: Used to declare tags for filtering tests, either at the class or method level; analogous to test groups in TestNG or Categories in JUnit 4. Such annotations are inherited at the class level but not at the method level.

@Disabled

@Disabled : Used to disable a test class or test method; analogous to JUnit 4’s @Ignore. Such annotations are not inherited.

@Timeout

@Timeout: Used to fail a test, test factory, test template, or lifecycle method if its execution exceeds a given duration. Such annotations are inherited.

Examples

JUnit 5 Test Suites

The test suite is a container that has a set of tests that can be executed together. For instance, say we have multiple tests and want to execute all of them or subset of them under certain conditions. Like we want to run all the tests in the integration stage, a subset of tests in the developer environment before pushing code. All these can be done using Test Suite. Using JUnit 5 test suites, we can run tests spread into multiple test classes and different packages. JUnit 5 provides two annotations: @SelectPackages and @SelectClasses to create test suites. Additionally, you can use other annotations for filtering test packages, classes, or even test methods.

Filtering Tests in Suites

Tests in JUnit5 can be executed with @RunWith. The same annotation is also used for Junit 4. The only difference Is in Junit 5 we pass JUnitPlatform as a parameter. In this article we will go though some sample use cases of creating TestSuite in JUnit 5 and how to filter test classes, test methods in the test suite etc.

@SelectPackages

With this annotation, we can tell the Test Suite to scan all the mention packages and its sub-packages and execute all the Test Classes. We can also specify a signal package or multiple packages. Following example demonstrates this.

Select a single package

With @SelectPackages we can select test classes only from a specified package or list of packages. In the following example, all the Test classes from package com.bootng will be executed.

import org.junit.platform.runner.JUnitPlatform;
import org.junit.platform.suite.api.SelectPackages;
import org.junit.runner.RunWith;

@RunWith(JUnitPlatform.class)
@SelectPackages({ "com.bootng" })
public class TestSuiteWithPackageSingle {

}

Select multiple packages

Similarly, if we want to support multiple packages then we can specify multiple package names. The following example will execute tests from the two packages.

@RunWith(JUnitPlatform.class)
@SelectPackages({ "com.bootng.assertions", "com.bootng.display" })
public class TestSuiteWithPackageMultiple {

}

@SelectClasses

Select Two Classes

In this example rather than selecting packages, we can specify individual test classes that we want to include in the Test Suite. In the following example essentially we will have only two Test classes in the Test Suite.

@RunWith(JUnitPlatform.class)
@SelectClasses({ DisplayExampleTest.class, DisplayGeneratorExampleTest.class })
public class TestSuiteWithSelectClass {

}

@IncludePackages and @ExcludePackages

@IncludePackages and @ExcludePackages work only at the specified package level and it won't scan sub-packages. This annotation is used with @SelectPackages annotation to fine-tune the filtering. Son in the following example Test Classes from only com.bootng.assertions will be included.

IncludePackages Example

Here

@RunWith(JUnitPlatform.class)
@SelectPackages({ "com.bootng" })
@IncludePackages({ "com.bootng.assertions" })
public class TestSuite_IncludePackage {

}

ExcludePackages Example

Includes all the test form package com.bootng, but excludes tests from sub package com.bootng.assertions.

@RunWith(JUnitPlatform.class)
@SelectPackages({ "com.bootng" })
@IncludePackages({ "com.bootng.assertions" })
public class TestSuite_IncludePackage {

}

@IncludeClassNamePatterns and @ExcludeClassNamePatterns

Rather than filtering the test class from packages, we can also filter them based on the name of the Test Classes. To specify test class names patterns to exclude or include, you can use @IncludeClassNamePatterns and @ExcludeClassNamePatterns annotations.

IncludeClassNamePatterns Example

In this example, we can including only the test whose name ends with "Test" from the package (and sub packages) of com.bootng

@RunWith(JUnitPlatform.class)
@SelectPackages({ "com.bootng" })
@IncludeClassNamePatterns("^.*Test*$")
public class TestSuite_NamePattern {

}

@IncludeTags and @ExcludeTags

IncludeTags Example

With IncludeTags and Exclude Tags we can filter Classes or Methods that are Tagged with the specified tag. For Instance, the following example, we are scanning package com.bootng.assertions and then only interested in including Test Classes or Test Methods tagged with Weather.

@RunWith(JUnitPlatform.class)
@SelectPackages({ "com.bootng.assertions" })
@IncludeTags({ "Weather" })
public class TestSuite_TagInclude {

}

ExcludeTags Example

Similar to IncludeTags tag to filter Test Methods or Test Classes but for exclusion. The following example will exclude all the Tests tagged with "Weather"

@RunWith(JUnitPlatform.class)
@SelectPackages({ "com.bootng.assertions" })
@ExcludeTags({ "Weather" })
public class TestSuite_TagExclude {

}

Summary

JUnit 5 provides powerful ways to filter Test cases in Test Suites. We have several options starting from including/excluding a specific packages to include/exclude specific Classes to Include/Exclude specific methods.

Test Classes and Methods Requirement

JUnit 5 is the latest version of Junit. It has a brand new architecture and more capabilities compared to the previous generation of Junit. In this article, we will quickly go through some of the main features and concepts of JUnit 5. In this article we go over the high-level structural requirement for writing Unit Tests. Generally, we write test method to represent a test case or a certain scenario which we want to validate. Such test methods would reside inside a Class. With Junit5 we don't need to mark or annotate the main class with any special JUnit specific annotations. Junit5 will be able to

Test Class

Any top-level class, static member class, or @Nested class that contains at least one test method. We don't need to annotate the Class, JUnit5 will be able to find test methods defined inside it.

Class Requirement

The Class should contain only one Constructor and the Class should not be an abstract Class.

Test Method

Any not abstract instance method that is annotated with @Test, @RepeatedTest, @ParameterizedTest, @TestFactory, or @TestTemplate.

Test Method

The test method should not return any value and should not be abstract.

Lifecycle Method

Any method that is directly annotated or meta-annotated with @BeforeAll, @AfterAll, @BeforeEach, or @AfterEach Lifecycle methods can be inherited from parent class. Lifecycle methods should not be private and should not return any value.

Lifecycle Method

Should not be private and should not return value. @BeforeAll and @AfterAll should be used on a static method

Example

Following Example shows a Test Class with one test method annotated with @Test and four Lifecylcle emthods

SimpleHelloTest3

package com.bootng.start;

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;

import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.BeforeEach;

public class SimpleHelloTest3 {

	@BeforeAll
	public static void method1() {
		System.out.println("method 1");
	}
	
	@BeforeEach
	public void method2() {
		System.out.println("method 2");
	}
	
	@AfterAll
	public static void method3() {
		System.out.println("method 3");
	}
	
	@AfterEach
	public void method4() {
		System.out.println("method 4");
	}
	
	@Test
	public void test_hello() {
		String msg = "hello";
		assertEquals(msg, "hello", " message is equal Hello");
		System.out.println("");
	}

}

Running the above test would output the following. method1 and method2 would be executed before the actual test and then method4 and method3 would be executed.

Console Output

method 1 method 2 test_hello method 4 method 3

JUnit5 Writing first Test

SimpleHelloTest

First Junit5 Test. This test has only one test method which asserts that the message string is equal to "hello"

package com.bootng.start;

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;

public class SimpleHelloTest {

	@Test
	public void test_hello() {
		String msg = "hello";
		assertEquals(msg, "hello", " message is equal Hello");

	}

}

When running this test, the test will surely pass since the assert condition will be successfull.

JUnit 5 Introduction

JUnit 5 is the latest version of JUnit. It has a brand new architecture and more capabilities compared to the previous generation of JUnit. In this article, we will quickly go through some of the main features and concepts of JUnit 5 through hands on examples.

JUnit 5 Project

JUnit 5 is composed of mainly three sub-projects JUnit Platform, JUnit Jupiter, and JUnit Vintage. junit-jupiter-api (JUnit Platform): JUnit Jupiter API for writing tests and extensions.
junit-jupiter-engine(JUnit Jupiter) : JUnit Jupiter test engine implementation, only required atruntime.
junit-vintage-engine:(JUnit Vintage): To run tests wittern in older version of JUnit on JUnit 5 Platform.

This article is focused on JUnit5 with maven as a build tool. Other than the maven related configurations information in this articles holds true for other build environments also.

Java 8

JUnit 5 requires a minimum Java 8 version

JUnit 5 Artifacts

If you’re using Maven you can add the corresponding subprojects in your pom file (juinit-jupiter-api, junit-jupiter-engine, junit-vintage-engine). Starting with Juinit 5.4 we can also simply add aggregate artifact named junit-jupiter in our pom.xml to include all the JUnit 5 related dependencies to our project.

JUnit 5 Maven Dependencies

<dependency>
 <groupId>org.junit.jupiter</groupId>
 <artifactId>junit-jupiter</artifactId>
 <version>5.7.0-M1</version>
 <scope>test</scope>
</dependency>

Main Features of JUnit 5

Following are the main features in JUnit 5

Supports Lambda expressions.
Nested Unit Tests
Parameterized Unit Tests
Conditional Test inclusion or exclusion
Extension Model

Main Annotations

Tests written in JUnit5 follow some standard approach and it is done by utilizing the capabilities provided by the JUnit 5 framework. The following are some of the annotations provided by JUnit 5. This is just to provide some quick pointers to the rich feature sets of JUnit 5.

Common annotations

@Test – denotes a test method, it does not take any arguments.

@DisplayName – specifies a custom name for the test class or method.

@DisplayNameGeneration - specify a generator to generate a custom name for method or class.

@Nested - it marks a class a nested test

@Disabled – prevents a test class or method from executing;

@BeforeEach,

@AfterEach – runs the annotated method before or after each test method in the same class.

@BeforeAll,

@AfterAll – runs the annotated method before any or after all of the test methods in the class.

Next: Writing first Test in JUnit 5

Writing first Test in JUnit 5

References

Junit 5 User Guide

JUnit 5 Source Code on Git

JUnit 5 Gitter

JUnit 5 related examples

JUnit 5 Maven repo

Roman Number

Negative Numbers and Range

Conversion Rules

Implementation

References

Java Threads Print Alternative Odd Even Numbers

What we are trying to achieve

Java Code

Java Thread States

Matrix Rotation in Java

Rotating Matrix to 90 Clockwise

With Matrix Transpose

Matrix Rotation in Single pass

Eclipse Google Java Style Guide

Get the Style Guide

Open Eclipse Preference

Add the Google Style formatter to Eclipse

Configure save actions to automatically format code while saving files.

JUnit 5 Tutorial : Display name

Display Name Example

Display CustomName Example

Custom Name Generator Example

JUnit5 Important Annotations

@Test

@ParameterizedTest

@RepeatedTest

@TestMethodOrder

@DisplayName

@DisplayNameGeneration

@BeforeEach

@AfterEach

@BeforeAll

@AfterAll

@Nested

@Tag

@Disabled

@Timeout

Next

JUnit 5 Test Suites

Filtering Tests in Suites

@SelectPackages

@SelectClasses

@IncludePackages and @ExcludePackages

@IncludeClassNamePatterns and @ExcludeClassNamePatterns

@IncludeTags and @ExcludeTags

Summary

Test Classes and Methods Requirement

Test Class

Test Method

Lifecycle Method

Example

JUnit5 Writing first Test

JUnit 5 Introduction

JUnit 5 Project

JUnit 5 Artifacts

Main Features of JUnit 5

Main Annotations

Next: Writing first Test in JUnit 5

References

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