Tutorial Playlist
191 Lessons1. Introduction to Java
2. What is Java?
3. History of Java
4. Java Tutorial for Beginners
5. How Do Java Programs Work?
6. JDK in Java
7. C++ Vs Java
8. Java vs. Python
9. Java vs. JavaScript
10. From Java Source Code to Executable
11. How to Install Java in Linux
12. How to Install Java in Windows 10
13. Java Hello World Program
14. Structure of Java Program and Java Syntax
15. Operators in Java
16. Java If-else
17. Switch Case In Java
18. Loops in Java
19. Infinite loop in Java
20. For Loop in Java
21. For Each Loop in Java
22. Constructor in Java
23. Constructor Overloading in Java
24. Copy Constructor in Java
25. Default Constructor in Java
26. Parameterized Constructors in Java
27. Constructor Chaining In Java
28. Finalize Method in Java
29. Static Method in Java
30. Equals Method in Java
31. Abstract Method in Java
32. toString() Method in Java
33. Difference between equals method in Java
34. Inheritance in Java
35. Multiple Inheritance in Java
36. Hierarchical Inheritance in Java
37. Java Classes and Objects
38. Scanner Class in java
39. All classes in java are inherited from which class
40. What is Nested Class in Java
41. POJO Class in Java
42. Anonymous Class in Java
43. Final Class in Java
44. Object Class in Java
45. Packages in Java
46. Access Modifiers in Java
47. Static Keyword In Java
48. Final Keyword in Java
49. Checked and Unchecked Exceptions in Java
50. User Defined Exception in Java
51. Error vs. Exception in Java
52. Java Collection
53. Collections in Java
54. Garbage Collection in Java
55. Generics In Java
56. Java Interfaces
57. Functional Interface in Java
58. Marker Interface in Java
59. Streams in Java
60. Byte stream in java
61. File Handling in Java
62. Thread in Java
63. Thread Lifecycle In Java
64. Daemon Thread in Java
65. Thread Priority in Java
66. Deadlock in Java
67. String Pool in Java
68. Java Database Connectivity(JDBC)
69. Design Patterns in Java
70. Functional Programming in Java
71. OOP vs Functional vs Procedural
72. Heap Memory and Stack Memory in Java
73. Applet in Java
74. Java Swing
75. Java Frameworks
76. Hibernate Framework
77. JUnit Testing
Now Reading
78. How to Install Eclipse IDE for Java?
79. Command line arguments in Java
80. Jar file in Java
81. Java Clean Code
82. OOPs Concepts in Java
83. Java OOPs Concepts
84. Overloading vs Overriding in Java
85. Java 8 features
86. String in Java
87. String to int in Java
88. Why String Is Immutable in Java?
89. Primitive Data Types in Java
90. Non-Primitive Data Types in Java
91. This and Super Keyword in Java
92. HashMap in Java
93. Comparable And Comparator in Java
94. Type Casting in Java
95. Arrays Sort in Java with Examples
96. Variable Hiding and Variable Shadowing in Java
97. Enum in Java
98. Substring in Java
99. Pattern Programs in Java
100. Hashcode in Java
101. What is ByteCode in Java?
102. How To Take Input From User in Java
103. GCD of Two Numbers in Java
104. Linked List in Java
105. Arithmetic Operators in Java
106. Conditional Operators in Java
107. Stack and Queue in Java
108. Array Length in Java
109. Number Pattern Program in Java
110. Split in java
111. Map In Java
112. Difference Between Throw and Throws in Java
113. Difference Between Data Hiding and Abstraction
114. HashSet in Java
115. String Length in Java
116. Factorial Using Recursion in Java
117. DateFormat in Java
118. StringBuilder Class in java
119. Instance variables in Java
120. Java List Size
121. Java APIs
122. Reverse an Array in Java
123. StringBuffer and StringBuilder Difference in Java
124. Java Program to Add Two Numbers
125. String to Array in Java
126. Regular Expressions in Java
127. Identifiers in Java
128. Data Structures in Java
129. Set in Java
130. Pass By Value and Call By Reference in Java
131. Try Catch in Java
132. Bubble Sort in Java
133. Caesar Cipher Program in Java
134. Queue in Java
135. Object Creation in Java
136. Multidimensional Array in Java
137. How to Read a File in Java
138. String Comparison in Java
139. Volatile Keyword in Java
140. Control Statements in Java
141. Jagged Array in Java
142. Two-Dimensional Array in Java
143. Java String Format
144. Replace in Java
145. charAt() in Java
146. CompareTo in Java
147. Matrix Multiplication in Java
148. Static Variable in Java
149. Event Handling in Java
150. parseInt in Java
151. Java ArrayList forEach
152. Abstraction in Java
153. String Input in Java
154. Logical Operators in Java
155. instanceof in Java
156. Math Floor in Java
157. Selection Sort Java
158. int to char in Java
159. Stringtokenizer in java
160. Implementing and Manipulating Abs in Java
161. Char array to string in java
162. Convert Double To String In Java
163. Deque in Java
164. Converting a List to an Array in Java
165. The Max function in java
166. Removing whitespace from string in java
167. String arrays in Java
168. Strings in Java Vs Strings in Cpp
169. Sum of digits of a number in Java
170. Art of Graphical User Interfaces
171. Trim in Java
172. RxJava
173. Recursion in Java
174. HashSet Java
175. Difference Between Java and Python
176. Square Root in Java
177. Reverse A String in Java
178. Even Odd Program in Java
179. Fibonacci Series in Java
180. Prime Number Program in Java
181. Java Program to Print Prime Numbers in a Given Range
182. Java Leap Year Program
183. Swapping of Two Numbers in Java
184. LCM of Two Numbers in Java
185. Math.sqrt() Function in Java
186. Area of Triangle in Java
187. Sort a String In Java
188. Factorial Program in Java
189. Javafx
190. Lambda expression in java
191. Setup Java Home and IDE on macOS
In the world of software development, ensuring the reliability and quality of code is of utmost importance. One popular tool that aids in achieving this goal is JUnit. It is used for testing Java applications. If you're a Java developer, you may have come across the term "JUnit" before, but what is JUnit in Java? In this blog post, we will delve into the depths of JUnit, exploring its purpose, features, and advantages. We will also discuss the concept of unit testing and why it is essential in software development.
JUnit is an open-source testing framework specifically designed for Java applications. It provides a platform to write and run automated tests, allowing developers to verify the correctness of their code at the unit level. JUnit simplifies the process of writing test cases and provides numerous utilities for asserting expected outcomes and handling test execution.
Now that you have an idea of what is JUnit? Let's understand unit testing.
Unit testing is a software testing methodology where individual units or components of a software system are checked in isolation. A unit can be a method, a class, or a group of closely related classes. Unit testing aims to ensure that each unit functions correctly on its own before integrating it into the larger system. By isolating and testing individual units, developers can detect and fix issues early in the development cycle.
What is JUnit testing, and what is the need for it?
JUnit testing plays a crucial role in ensuring the reliability and quality of software. Here are a few reasons why it is necessary:
A unit test case is a specific test scenario designed to verify the behavior of a unit of code. It consists of inputs, expected outputs, and assertions to check whether the actual outputs match the expected ones. Unit test cases are typically written using JUnit, allowing developers to define test suites that contain multiple test cases.
For example, let's consider a simple calculator application. A unit test case for the ‘addition’ functionality would involve providing two numbers as inputs, executing the addition operation, and asserting that the result matches the expected sum.
JUnit offers several features that make it a powerful testing framework. Some of the notable features include:
JUnit annotations are special markers or metadata used to provide instructions to the JUnit framework on executing and handling tests. These are placed before methods or classes and provide additional information or directives to control the test execution flow. JUnit annotations help in organizing and customizing test cases, defining setup and teardown operations, and handling exceptions.
JUnit leverages annotations to define and control the execution of tests. Here are a few commonly used ones:
While JUnit offers numerous benefits for software testing, it's important to consider both its advantages and disadvantages. Let's explore them:
It's crucial to weigh these advantages and disadvantages when considering JUnit for testing projects. While it excels in unit testing and offers many benefits, it's essential to assess the specific requirements and adapt the testing strategy accordingly.
While JUnit is commonly used for unit testing, it can also be integrated with Selenium, a popular framework for web application testing. By this combination, developers can create automated tests that verify the functionality and behavior of web applications.
JUnit provides a structure for writing test cases, and Selenium provides a set of APIs to interact with web elements, simulate user actions, and perform verifications. Together, they enable developers to automate the testing of web applications across different browsers and platforms.
For example, a test case written with JUnit and Selenium may involve opening a web page, interacting with various elements like buttons or forms, and asserting that the expected results are displayed, or actions are performed correctly.
Integrating JUnit with Selenium allows for the seamless incorporation of web application testing into the overall testing strategy, ensuring comprehensive coverage of different layers of the software stack.
JUnit has revolutionized the way Java developers approach software testing. Its simplicity, powerful features, and seamless integration with Java make it an indispensable tool for ensuring reliable software quality. By enabling developers to write comprehensive unit tests, JUnit empowers them to catch bugs early, maintain code quality, and build robust applications. Embracing JUnit and the practice of unit testing is a valuable step toward delivering high-quality software products.
1. How do I write a simple JUnit test case?
Ans: Use the @Test annotation to mark a method as a test case. Write test logic inside the annotated method and use assertions to verify expected outcomes.
2. How do I handle exceptions in JUnit tests?
Ans: You can use the @Test annotation's expected attribute to specify the anticipated exception. Alternatively, you can use the @Rule annotation with the ExpectedException rule to handle anomalies.
3. How do I perform setup operations before each test case?
Ans: Use the @Before annotation to designate a method that should be executed before each test case. Perform necessary setup operations, such as initializing objects or resources, inside this method.
4. How do I clean up resources after each test case?
Ans: Use the @After annotation to mark a method that should be executed after each test case. Perform cleanup operations, such as releasing resources or resetting the state, inside this method.
5. How do I set up common resources once before all test cases?
Ans: Use the @BeforeClass annotation to designate a method that should be executed once before all test cases in a test class. Perform one-time setup operations, such as initializing a database connection or loading configuration, inside this method.
PAVAN VADAPALLI
Director of Engineering
Director of Engineering @ upGrad. Motivated to leverage technology to solve problems. Seasoned leader for startups and fast moving orgs. Working …Read More
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upGrad does not grant credit; credits are granted, accepted or transferred at the sole discretion of the relevant educational institution offering the diploma or degree. We advise you to enquire further regarding the suitability of this program for your academic, professional requirements and job prospects before enr...