What is Data Driven Testing? Learn to create Framework

What is Data Driven Testing?

Data-driven is a test automation framework which stores test data in a table or spread spreadsheet format. This allows automation engineers to have a single test script which can execute tests for all the test data in the table.

In this framework, input values are read from data files and are stored into a variable in test scripts. Ddt (Data Driven testing) enables building both positive and negative test cases into a single test.

In Data-driven test automation framework, input data can be stored in single or multiple data sources like xls, XML, csv, and databases.

In this tutorial, you will learn

Why Data Driven Testing?

Frequently we have multiple data sets which we need to run the same tests on. To create an individual test for each data set is a lengthy and time-consuming process.

Data Driven Testing framework resolves this problem by keeping the data searate from Functional tests. The same test script can execute for different combinations of input test data and generate test results.

Example:

For example, we want to test the login system with multiple input fields with 1000 different data sets.

To test this, you can take following different approaches:

Approach 1) Create 1000 scripts one for each dataset and runs each test separately one by one.

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Approach 2) Manually change the value in the test script and run it several times.

Approach 3) Import the data from the excel sheet. Fetch test data from excel rows one by one and execute the script.

In the given three scenarios first two are laborious and time-consuming. Therefore, it is ideal to follow the third approach.

Thus, the third approach is nothing but a Data-Driven framework.

How to create a Data Driven Automation Framework

Consider you want to Test Login functionality of an application.

Step 1) Identify the Test Cases

Input Correct username and password – Login Success
Input incorrect username and correct password – Login Failure
Input correct username and incorrect password - Login Failure

Step 2) Create detailed est Steps for above 3 Test Cases

Test Case#	Description	Test Steps	Test Data	Expected Results
1	Check Login for valid credentials	Launch the application Enter Username password Click Okay Check Results	Username: valid password: valid	Login Success
2	Check Login for invalid credentials	Launch the application Enter Username password Click Okay Check Results	Username: invalid password: valid	Login Fail
3	Check Login for invalid credentials	Launch the application Enter Username password Click Okay Check Results	Username: valid password: invalid	Login Fail

Step 3) Create Test Script

If you observe the Test Steps Remain common through the 3 Test Steps. You need to create a Test Script to execute these steps

// This is Pseudo Code 

// Test Step 1: Launch Application 
driver.get("URL of the Appliation");  

// Test Step 2: Enter Password 
txtbox_username.sendKeys("valid"); 

// Test Step 3: Enter Password 
txtbox_password.sendKeys("invalid"); 

// Test Step 4: Check Results 
If (Next Screen) print success else Fail

Step 4) Create an excel/csv with the Input Test Data

Step 5) Step Modify the Scrip to Loop over Input Test Data. The input commands should also be parameterized

// This is Pseudo Code
// Loop 3 Times
for (i = 0; i & lt; = 3; i++) {
    // Read data from Excel and store into variables
    int input_1 = ReadExcel(i, 0);
    int input_2 = ReadExcel(i, 1);

    // Test Step 1: Launch Application
    driver.get("URL of the Application");

    // Test Step 2: Enter Password
    txtbox_username.sendKeys(input_1);
    // Test Step 3: Enter Password

    txtbox_password.sendKeys(input_2);
    // Test Step 4: Check Results
    If(Next Screen) print success
    else Fail
}

Above are just 3 test cases. The test script can be used to loop over following test cases just by appending test data values to Excel

Input incorrect username and incorrect password – Login Fail
Input correct username and password blank – Login Fail
Input blank username and blank password– Login Fail

And so on

Best practices of Data Driven testing:

Below given are Best testing practices for Data-Driven testing:

It is ideal to use realistic information during the data-driven testing process
Test flow navigation should be coded inside the test script
Drive virtual APIs with meaningful data
Use Data to Drive Dynamic Assertions
Test positive as well as negative outcomes
Repurpose Data Driven Functional Tests for Security and Performance

Advantages of Data-Driven testing

Data-Driven offer many advantages some of them are:

Allows to test application with multiple sets of data values during Regression testing
Test data and verification data can be organized in just one file, and it is separate from the test case logic.
Base on the tool, it is possible to have the test scripts in a single repository. This makes the texts easy to understand, maintain and manage.
Actions and Functions can be reused in different tests.
Some tools generate test data automatically. This is useful when large volumes of random test data are necessary, which helps to save the time.
Data-driven testing can perform any phase of the development. A data-driven test cares are generally merged in the single process. However, it can be used in multiple test cases.
Allows developers and testers to have clear separation for the logic of their test cases/scripts from the test data.
The same test cases can be executed several times which helps to reduce test case and scripts.
Any changes in the test script do not effect the test data

Disadvantages of Data Driven testing:

Some Drawbacks of Data Driven Automation Testing method are:

Quality of the test is depended on the automation skills of the Implementing team
Data validation is a time-consuming task when testing large amount of data.
Maintenance is a big issue as large amount of coding needed for Data-Driven testing.
High-level technical skills are required. A tester may have to learn an entirely new scripting language.
There will be more documentation. Mostly related to scripts management tests infrastructure and testing results.
A text editor like Notepad is required to create and maintain data files.

Conclusion:

Data-driven is a test automation framework which stores test data in a table or spread spreadsheet format.
In Data-driven test automation framework, input data can be stored in single or multiple data sources like xls, XML, csv, and databases.
To create an individual test for each data set is a lengthy and time-consuming process. Data Driven Testing framework resolves this issue by keeping the data separate from Functional tests.
In Data Driven Testing, it is an ideal option to use realistic information
It allows testing application with multiple sets of data values during Regression testing
Drawback of this method is that it is depended on the automation skills of the Implementing team