Java
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Junit
- 1 Basics 9
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Classes
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Objects
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Arrays
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Variables
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Loops
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Numbers
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Strings
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Exceptions
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Regexp
- 2 OOP 9
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Inheritance
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Polymorphism
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Static
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Abstract
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Interfaces
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Constructors
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Packages
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Nested Classes
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Final
- 3 Compiler 2
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Sublime Text
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Apache Ant
- 4 Collections 8
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Lists
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Comparable
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Sets
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Maps
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Generics
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Properties
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Streams
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Json
- 5 Threads 4
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Create Thread
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Sleep
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Lock
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Scheduler
- 6 Design patterns 4
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Singleton
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Observer
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Strategy
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Mediator
- 7 Swing 12
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Frame
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Panel
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Listener
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Combo Box
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Label
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Image
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Menu
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Table
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Layout
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Drawing
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Timer
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Designer
- 8 I/O 7
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Streams IO
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Socket
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Watching Files
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Mail
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Logger
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Clipboard
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Encrypt
- 9 Effective 7
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Constructors
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Dependency Injection
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Composition
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Interfaces Default
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Import Static
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Enums
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Lambdas
- 10 Junit 5
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About Junit
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Test Case
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Suite Test
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Annotations
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Exceptions
- 11 Lambdas 7
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Expressions
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Functional Interfaces
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Streams
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Common Operations
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Default Methods
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Static Methods
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Single Responsibility
- 12 JavaFX 6
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Openjfx
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Scene Builder
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First App
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Jar Archive
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On Action
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Change Listener
- 13 Maven 4
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Demo
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Spring Boot
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Junit
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Guava
- 14 Spring Boot 8
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Quick start
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Rest service
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Consuming Rest
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Templates
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Scheduling Tasks
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Ajax
/
Exceptions
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Last update: 30-10-2021
Exceptions
p31 JUnit @Test supports an argument that specify an expected exception.T
/**
* Expected exception parameter ...
*
* You can pass an expected exception into the ...
* Test annotation definition.
*/
package com.minte9.junit.exceptions;
import static org.junit.Assert.assertEquals;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
public class Expected {
@Test public void no_squares() { // Failed
Squares squares = new Squares();
squares.average();
// ArithmeticException: / by zero
}
@Test(expected = ArithmeticException.class)
public void no_squares_expected() {
Squares squares = new Squares(); // Passed
squares.average();
}
@Test public void average() { // Passed
Squares squares = new Squares();
squares.add(3); // 9
squares.add(5); // 25
assertEquals(squares.average(), 17);
}
}
class Squares {
private List<Integer> squares = new ArrayList<>();
public void add(int x) {
squares.add(x * x);
}
public int average() throws ArithmeticException {
int total = squares.stream().mapToInt(Integer::intValue).sum();
return total / squares.size();
}
}
Test App exception when no args are provided.
T
/**
* Testing an application with no argumets in main()
*/
package com.minte9.junit.exceptions;
import org.junit.Test;
public class NoArgs {
@Test public void no_args() { // Failed
App.main(new String[] {});
// ArrayIndexOutOfBoundsException
}
@Test(expected = ArrayIndexOutOfBoundsException.class)
public void no_args_expected() {
App.main(new String[] {}); // Passed
}
@Test public void args() {
App.main(new String[] {"run"}); // Passed
}
}
class App {
public static void main(String[] args) {
String action = args[0];
System.out.println(action);
}
}
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