/junit

JUNIT Tutorial For Beginners

Primary LanguageJavaMIT LicenseMIT

JUnitIn28Minutes

Git hub repository for the free Udemy course : https://www.udemy.com/junit-tutorial-for-beginners-with-java-examples/

Get started with Junit

Topics

Section 1 Foundation

  • What is JUnit?
  • Why Unit Testing?

Section 2 First JUnit Example

@Test Annotation

  • Running JUnit
  • No Failure = Success
  • Basic Assert methods

Section 3 Second JUnit Example

  • assertTrue and assertFalse methods
  • @Before @After annotations
  • @BeforeClass @AfterClass annotations

Section 4 JUnit Simple Test Scenarios

  • Comparing Arrays
  • Testing Exceptions
  • Performance Unit Tests

Section 5 JUnit Intermediate Test Scenarios

  • Parameterized Tests
  • Test Suites

Section 6 JUnit Best Practices

  • Naming Test Methods
  • Highlight Important Values in Tests
  • Handle Exceptions Properly
  • Readable Assert Statements

Starting Examples

package com.in28minutes.junit.helper;

public class StringHelper {

	public String truncateAInFirst2Positions(String str) {
		if (str.length() <= 2)
			return str.replaceAll("A", "");

		String first2Chars = str.substring(0, 2);
		String stringMinusFirst2Chars = str.substring(2);

		return first2Chars.replaceAll("A", "") 
				+ stringMinusFirst2Chars;
	}

	public boolean areFirstAndLastTwoCharactersTheSame(String str) {

		if (str.length() <= 1)
			return false;
		if (str.length() == 2)
			return true;

		String first2Chars = str.substring(0, 2);

		String last2Chars = str.substring(str.length() - 2);

		return first2Chars.equals(last2Chars);
	}

}

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