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joplin notion extension/Web Development/Java/Unit tests.md
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joplin notion extension/Web Development/Java/Unit tests.md
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Unit tests
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https://www.freecodecamp.org/news/java-unit-testing/
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https://www.youtube.com/watch?v=vZm0lHciFsQ : junit
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https://www.youtube.com/watch?v=HsQ9OwKA79s : mockito
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- JUnit are for unit tests. Unit tests means isolating piece of code and then testing it to see if that component is working or not
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- Initializing maven project
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Follow the maven project directory structure. Add following in `pom.xml`. In following code junit dependency is added with scope test(means they r recognized in src/test/java not src/main/java) and relevant source and target is set in cofiguration of maven compiler plugin. In configuration of maven jar plugin set the manifest to include class containing main method
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.example</groupId>
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<artifactId>demo</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>demo</name>
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<description>Demo project for JUnit Tests</description>
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<url/>
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<licenses>
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<license/>
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</licenses>
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<developers>
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<developer/>
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</developers>
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<scm>
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<connection/>
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<developerConnection/>
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<tag/>
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<url/>
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</scm>
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<properties>
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<java.version>17</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.10</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.1</version>
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<configuration>
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<source>11</source> <!-- Specify your desired Java version -->
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<target>11</target> <!-- Specify your desired Java version -->
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-jar-plugin</artifactId>
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<version>3.2.0</version>
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<configuration>
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<archive>
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<manifestEntries>
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<Main-Class>com.example.demo.MyClass</Main-Class>
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</manifestEntries>
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</archive>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>
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```
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- In following code , it can be noticed that test cases are in same package as in main program. The operation involve for test cases are methods like `assertEquals`, `assertTrue`,`assertNotEquals`, `assertThrows`, `assertDoesNotThrow`.
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- In GradleClassTest, in assertThrows lambda is used ie `()->` which contains the code to be executed and if throws exception matching the one in first param that the test case will pass
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Program
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in `src/main/java/com/example/demo/SimpleCalculator.java`
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```java
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package com.example.demo;
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public class SimpleCalculator {
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public int add(int numberA,int numberB){
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return numberA+numberB;
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}
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}
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```
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Test case
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in `src/test/java/com/example/demo/SimpleCalculatorTest.java`
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```java
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package com.example.demo;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import org.junit.jupiter.api.DisplayName;
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import org.junit.jupiter.api.Test;
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public class SimpleCalculatorTest {
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@Test
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@DisplayName("2+2 equal to 4")
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void twoPlusTwoShouldEqualFour(){
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// var can be used for local variables so it can be used for SimpleCalculator here
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System.out.println("This test passed");
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var calculator=new SimpleCalculator();
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assertEquals(4,calculator.add(2, 2));
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assertTrue(calculator.add(2, 2)==4 );
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}
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@Test
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@DisplayName("3+7 equal to 10")
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void threePlusSevenShouldEqualTen(){
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var calculator=new SimpleCalculator();
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assertEquals(10, calculator.add(3, 7));
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}
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}
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```
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in `src/main/java/com/example/demo/GradleClass.java`
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```java
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package com.example.demo;
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public class GraderClass {
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public char determineLetterGrade(int numberGrade){
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if(numberGrade<0){
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throw new IllegalArgumentException("Number grade cannot be negative");
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}
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if(numberGrade <60){
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return 'F';
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}
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if(numberGrade <70){
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return 'D';
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}
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if(numberGrade <80){
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return 'C';
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}
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if(numberGrade <90){
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return 'B';
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}
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return 'A';
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}
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}
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```
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in `src/test/java/com/example/demo/GradleClassTest.java`
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```java
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package com.example.demo;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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public class GraderClassTest {
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GraderClass gc;
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@BeforeEach
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void setup(){
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gc= new GraderClass();
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}
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@Test
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public void NegativeReturnsIllegalArgumentException(){
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assertThrows(IllegalArgumentException.class, ()-> {gc.determineLetterGrade(-1);});
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}
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@Test
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public void FiftyMeansF(){
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assertEquals('F', gc.determineLetterGrade(50));
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}
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@Test
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public void SixtyMeansD(){
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assertEquals('D', gc.determineLetterGrade(60));
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}
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@Test
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public void SeventyMeansC(){
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assertEquals('C', gc.determineLetterGrade(70));
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}
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@Test
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public void EigtyMeansB(){
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assertEquals('B', gc.determineLetterGrade(80));
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}
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@Test
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public void NintyMeansA(){
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assertEquals('A', gc.determineLetterGrade(90));
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}
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}
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```
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