Data providers for parameterization in Selenium Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a DataProvider method in TestNG.

Selenium Java

import org.testng.annotations.DataProvider;

@DataProvider(name = "testData")
public Object[][] [1]() {
    return new Object[][] {
        {"user1", "pass1"},
        {"user2", "pass2"}
    };
}

Drag options to blanks, or click blank then click option'

AfetchData

BdataProvider

CprovideData

DgetData

Attempts:

3 left

💡 Hint

Common Mistakes

Using invalid method names or keywords as method names.

Forgetting to annotate the method with @DataProvider.

The method name for a DataProvider can be any valid method name. Here, getData is used as the method name.

2fill in blank

medium

Complete the test method annotation to use the DataProvider named "testData".

Selenium Java

import org.testng.annotations.Test;

@Test(dataProvider = [1])
public void loginTest(String username, String password) {
    // test code here
}

Drag options to blanks, or click blank then click option'

A"dataProvider"

B"userPass"

C"testData"

D"loginData"

Attempts:

3 left

💡 Hint

Common Mistakes

Using the method name instead of the DataProvider name.

Forgetting to put the name in quotes.

The dataProvider attribute in the @Test annotation must match the name of the DataProvider method, which is "testData" here.

3fill in blank

hard

Fix the error in the DataProvider method signature to make it valid.

Selenium Java

@DataProvider(name = "loginData")
public [1] loginData() {
    return new Object[][] {
        {"admin", "1234"},
        {"guest", "guest"}
    };
}

Drag options to blanks, or click blank then click option'

AObject[][]

Bvoid

CString[][]

Dint[][]

Attempts:

3 left

💡 Hint

Common Mistakes

Using void as return type.

Using primitive arrays like int[][] instead of Object[][].

A DataProvider method must return an Object[][] array containing test data sets.

4fill in blank

hard

Fill both blanks to correctly link the DataProvider to the test method and accept parameters.

Selenium Java

@Test(dataProvider = [1])
public void [2](String user, String pass) {
    System.out.println("User: " + user + ", Pass: " + pass);
}

Drag options to blanks, or click blank then click option'

A"loginData"

BloginTest

C"testData"

DdataTest

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching DataProvider names.

Incorrect method names that do not follow Java naming rules.

The test method must specify the correct DataProvider name and have a matching method name.

5fill in blank

hard

Fill all three blanks to create a DataProvider method and a test method that uses it with parameters.

Selenium Java

import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

@DataProvider(name = [1])
public Object[][] [2]() {
    return new Object[][] {
        {"admin", "admin123"},
        {"user", "user123"}
    };
}

@Test(dataProvider = [3])
public void verifyLogin(String username, String password) {
    System.out.println(username + " logs in with " + password);
}

Drag options to blanks, or click blank then click option'

A"userData"

BuserData

DuserDataProvider

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names in @DataProvider and @Test annotations.

Putting quotes around method names.

The DataProvider name in the annotation and the dataProvider attribute in @Test must match exactly as strings. The method name must be a valid Java method name.

Practice

1. What is the main purpose of using a @DataProvider in Selenium Java tests?

easy

A. To run the same test multiple times with different input data

B. To create a new browser instance for each test

C. To skip tests that are not ready

D. To generate reports automatically after tests

Solution

1. Step 1: Understand the role of @DataProvider

   @DataProvider supplies different sets of data to a test method, enabling multiple runs with varied inputs.

2. Step 2: Identify the main benefit

   This helps find bugs that appear only with certain inputs by running the same test repeatedly with different data.

3. Final Answer:

   To run the same test multiple times with different input data -> Option A

4. Quick Check:

   @DataProvider = multiple test runs with varied data [OK]

Hint: DataProvider runs tests repeatedly with different inputs [OK]

Common Mistakes:

• Thinking @DataProvider creates new browsers
• Confusing @DataProvider with test skipping
• Assuming it generates reports automatically

2. Which of the following is the correct syntax to declare a DataProvider method in Selenium Java?

easy

A. @DataProvider
public void dataProviderMethod() { }

B. @Test(dataProvider = "testData")
public void dataProviderMethod() { }

C. @DataProvider(name = "testData")
public void dataProviderMethod() { }

D. @DataProvider(name = "testData")
public Object[][] dataProviderMethod() { return new Object[][] {{"data1"}, {"data2"}}; }

Solution

1. Step 1: Check the method signature for DataProvider

   A DataProvider method must return Object[][] and be annotated with @DataProvider(name = "...").

2. Step 2: Verify the return type and annotation

   @DataProvider(name = "testData") public Object[][] dataProviderMethod() { return new Object[][] {{"data1"}, {"data2"}}; } correctly returns Object[][] and uses the proper annotation with a name.

3. Final Answer:

   @DataProvider(name = "testData") public Object[][] dataProviderMethod() { return new Object[][] {{"data1"}, {"data2"}}; } -> Option D

4. Quick Check:

   DataProvider method returns Object[][] [OK]

Hint: DataProvider methods return Object[][] with @DataProvider annotation [OK]

Common Mistakes:

• Using void return type for DataProvider
• Missing the name attribute in @DataProvider
• Annotating test method instead of DataProvider method

3. Given the following code snippet, what will be the output when the test runs?

@DataProvider(name = "numbers")
public Object[][] data() {
    return new Object[][] { {1, 2}, {3, 4} };
}

@Test(dataProvider = "numbers")
public void testSum(int a, int b) {
    System.out.println(a + b);
}

medium

A. No output because test is skipped

B. 1 and 2 printed on separate lines

C. 3 and 7 printed on separate lines

D. Compilation error due to wrong DataProvider

Solution

1. Step 1: Understand the DataProvider data

   The DataProvider returns two sets: {1, 2} and {3, 4}.

2. Step 2: Calculate the sum for each test run

   First run: 1 + 2 = 3; second run: 3 + 4 = 7; both printed on separate lines.

3. Final Answer:

   3 and 7 printed on separate lines -> Option C

4. Quick Check:

   Sum of pairs = 3, 7 [OK]

Hint: Sum each data pair printed per test run [OK]

Common Mistakes:

• Assuming only one test run happens
• Confusing data sets with single values
• Expecting compilation errors without syntax issues

4. Identify the error in the following DataProvider usage:

@DataProvider(name = "inputData")
public Object[] data() {
    return new Object[] {"A", "B"};
}

@Test(dataProvider = "inputData")
public void testMethod(String input) {
    System.out.println(input);
}

medium

A. DataProvider method should return Object[][], not Object[]

B. Test method parameter type is incorrect

C. Missing @Test annotation on DataProvider method

D. DataProvider name does not match test method

Solution

1. Step 1: Check DataProvider return type

   DataProvider methods must return Object[][] to supply multiple parameter sets.

2. Step 2: Identify mismatch in return type

   The method returns Object[], which is invalid and causes runtime errors.

3. Final Answer:

   DataProvider method should return Object[][], not Object[] -> Option A

4. Quick Check:

   DataProvider return type = Object[][] [OK]

Hint: DataProvider must return Object[][], not Object[] [OK]

Common Mistakes:

• Returning Object[] instead of Object[][]
• Confusing test method parameter types
• Forgetting to match DataProvider name

5. You want to test a login form with multiple username and password combinations using a DataProvider. Which approach correctly handles this scenario to avoid test failures when a password is empty or null?

@DataProvider(name = "loginData")
public Object[][] loginData() {
    return new Object[][] {
        {"user1", "pass1"},
        {"user2", ""},
        {"user3", null}
    };
}

@Test(dataProvider = "loginData")
public void testLogin(String username, String password) {
    // Test logic here
}

hard

A. Remove entries with empty or null passwords from DataProvider

B. Add validation inside testLogin to skip or handle empty/null passwords

C. Change DataProvider to return only usernames without passwords

D. Use separate test methods for each username-password pair

Solution

1. Step 1: Recognize the need to handle edge cases in test method

   Empty or null passwords can cause test failures if not handled properly.

2. Step 2: Implement validation inside testLogin method

   Adding checks to skip or handle empty/null passwords prevents failures and tests robustness.

3. Final Answer:

   Add validation inside testLogin to skip or handle empty/null passwords -> Option B

4. Quick Check:

   Handle edge cases inside test method [OK]

Hint: Validate inputs inside test to handle empty or null values [OK]

Common Mistakes:

• Removing test data instead of handling it
• Ignoring null or empty values causing failures
• Splitting tests unnecessarily instead of parameterizing