Introduction to Java

What is java?

Java is a programming language and a computing platform for application development.
It was first released by Sun Microsystem in 1995 and later acquired by Oracle Corporation in 2010.
In 2006 Sun started to make Java available under the GNU General Public License (GPL).
Lets see the phases of execution of a Java program:

1. Writing of the program is of course done by java programmer
2. Compilation of program is done by javac compiler, javac is the primary java compiler included in java development kit (JDK). It takes java program as input and generates java bytecode as output.
3. In third phase, JVM executes the bytecode generated by compiler. This is called program run phase.

So, now that we understood that the primary function of JVM is to execute the bytecode produced by compiler. Each operating system has different JVM, however the output they produce after execution of bytecode is same across all operating systems. That is why we call java as platform independent language.

Note: To execute any java program, need to install the JDK

Why java language and its features?

Java is popular because of the following features:

1. Simple programming language
2. Object Oriented Language
3. Distributed
4. Robust
5. Architecture Neutral or Machine Independent
6. Portable
7. Interpreted
8. High Performance
9. Multithreaded
10. Dynamic

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Difference between Selenium 1, Selenium 2 and Selenium 3

1. Selenium 1 = Selenium Remote Control
2. Selenium 2 = Selenium Webdriver, which combines elements of Selenium 1 and Webdriver.
3. Selenium 3 = Selenium  1 + Selenium 2 (RC is deprecated and moved to legacy package)

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Selenium Introduction

What is Selenium:

Selenium is an Automation Testing Framework which automates web applications for testing purposes.
It is an open source and mainly used for automating functional tests and regression tests.

Note: It can be integrated with automation test tools such as Maven, Jenkins, & Docker to achieve continuous testing. It can also be integrated with tools such as TestNG, & JUnit for running test cases and generating reports.

Features of selenium:

Selenium is popular because of the below features:

1. Selenium is an Open-Source.
2. Selenium supports multiple languages like Java, C#, python, Ruby, Perl, Php, Java script.
3. Supports multiple browsers like IE, Chrome, Firefox, Safari, Opera etc., (cross browser testing)
4. Supports multiple Operating Systems like Windows, Mac, Linux etc., (Cross platform testing)
5. Selenium supports for mobile platforms android and iOS
6. Supports parallel test execution
7. It can be integrated with other automation tools such as Maven, Jenkins and Docker etc.,
8. Can be integrated with test management tools such as Jira and ALM

Limitations of Selenium:

Below are the limitations with selenium but we can we can overcome these using some integration tools:

1. Selenium does not support automation testing for desktop applications
2. We should know at least one of the supported programming languages
3. Selenium does not have any inbuilt reporting capability
4. It does not have built-in Object Repository
5. It is not possible to perform testing on images
6. Since Selenium is open source software, you have to rely on community forums to get your technical issues resolved

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Introduction to Test Automation

What is Test Automation:
Test Automation or Automation Testing is a method of automating execution of tests and then 

compares actual test results with predicted or expected results using special software.

                                                                  (or)

Test automation means using a software tool to run repeatable tests against the application to be

tested.

Advantages of Automation Testing:

1. Faster execution and rapid feedback to developers
2. Supports regression testing.
3. Frequent execution and gives accurate results.
4. Lesser Investment in Human Resources (Better ROI)
5. Disciplined documentation of test cases
6. Customized defect reporting
7. Running tests anytime, anywhere un-attended
8. Better Test Coverage
9. Support for Agile and extreme development methodologies

Tools used for Automation Testing:
Below are some of the tools used for Test Automation

1. Selenium (Open Source or Free ware) - Owned by Thougtworks
2. UFT (Unified Functional Testing) (formerly QTP) (Commercial) – Owned by HP
3. RFT (Rational Functional Tester)(Commercial) - Owned by IBM
4. TestComplete (Commercial) – Owned by SmartBear Software
5. Ranorex (Commercial) – Owned by Ranorex

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What is Manual Testing and its Advantages, Limitations

Manual testing is a testing process that is carried out manually(executing test cases) in order to find defects without the usage of tools or automation scripting.

It is the most primitive of all testing types and helps find bugs in the software system.

Manual Testing does not require knowledge of any testing tool.
Advantages of Manual Testing:

• Faster execution and rapid feedback to developers
• Supports regression testing.
• Frequent execution and gives accurate results.
• Lesser Investment in Human Resources (Better ROI)
• Disciplined documentation of test cases
• Customized defect reporting.
• Running tests anytime, anywhere un-attended.
• Better Test Coverage.
• Support for Agile and extreme development methodologies

Limitations of Manual Testing:

• More people are required.
• More tedious. (Tiresome, As repeating thing get tired)
• More time is consumed.
• Can’t be repeated so easily.
• Concurrency is missing. (i.e. all the users cannot give request at the same instant of time)

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Introduction to Software Testing

What is Software Testing:

Software Testing is a process of verifying or validating an application with the intention of finding bugs or defects.

This can be done through either manually or using automation tool.

Definition of a Defect: 

It is a deviation from the requirement specification. (difference between expected result and actual result)

Importance of Software Testing:

• It is an essential since it makes sure of the Customer’s reliability and their satisfaction in the application.
• It is very important to ensure the Quality of the product. Quality product delivered to the customers helps in gaining their confidence.
• Testing is required for an effective performance of software application or product.
• It is important to ensure that the application should not result into any failures because it can be very expensive in the future or in the later stages of the development.

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