DataProvider with external data in Selenium Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a DataProvider method that reads data from an external source.

Selenium Java

import org.testng.annotations.DataProvider;

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

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

AgetData

BdataProvider

CfetchData

DloadData

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method name different from the DataProvider name without specifying it in the annotation.

Returning a wrong data type instead of Object[][].

The DataProvider method must have a name. Here, 'getData' is the method name matching the DataProvider annotation.

2fill in blank

medium

Complete the test method signature to use the DataProvider named "userData".

Selenium Java

import org.testng.annotations.Test;

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

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

AloginData

BuserData

CtestData

DdataSet

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong DataProvider name that does not exist.

Omitting the dataProvider attribute.

The test method must reference the DataProvider by its name, which is 'userData' here.

3fill in blank

hard

Fix the error in the DataProvider method to correctly read data from an external CSV file.

Selenium Java

import org.testng.annotations.DataProvider;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.List;

@DataProvider(name = "csvData")
public Object[][] [1]() throws Exception {
    List<Object[]> data = new ArrayList<>();
    BufferedReader br = new BufferedReader(new FileReader("data.csv"));
    String line;
    while ((line = br.readLine()) != null) {
        String[] parts = line.split(",");
        data.add(parts);
    }
    br.close();
    return data.toArray(new Object[0][]);
}

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

AloadCsv

BcsvData

CreadCsv

DgetCsvData

Attempts:

3 left

💡 Hint

Common Mistakes

Method name not matching the DataProvider name.

Incorrect return type or array conversion.

The method name must match the DataProvider name or be referenced by it. Here, 'getCsvData' is the method name that should be used.

4fill in blank

hard

Fill both blanks to correctly use the DataProvider method and handle exceptions in the test method.

Selenium Java

import org.testng.annotations.Test;

@Test(dataProvider = "[1]")
public void testLogin(String user, String pass) throws [2] {
    // test logic here
}

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

AgetCsvData

BIOException

CSQLException

DInterruptedException

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong DataProvider name.

Not declaring the required exception in the test method.

The test method uses the DataProvider named 'getCsvData' and must declare 'IOException' because the DataProvider method throws it.

5fill in blank

hard

Fill all three blanks to create a DataProvider that reads from an Excel file and returns data for the test.

Selenium Java

import org.testng.annotations.DataProvider;
import java.io.FileInputStream;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import java.util.ArrayList;
import java.util.List;

@DataProvider(name = "excelData")
public Object[][] [1]() throws Exception {
    FileInputStream file = new FileInputStream("data.xlsx");
    XSSFWorkbook workbook = new XSSFWorkbook(file);
    Sheet sheet = workbook.getSheetAt([2]);
    List<Object[]> data = new ArrayList<>();
    for (Row row : sheet) {
        Cell cell1 = row.getCell(0);
        Cell cell2 = row.getCell(1);
        data.add(new Object[] {cell1.getStringCellValue(), cell2.getStringCellValue()});
    }
    workbook.close();
    file.close();
    return data.toArray(new Object[[3]][]);
}

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

AgetExcelData

B0

Cdata.size()

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong sheet index.

Incorrect array size in toArray method.

Method name not matching DataProvider name.

The method name is 'getExcelData', the sheet index is 0 (first sheet), and the array size is data.size() to convert the list to array.

Practice

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

easy

A. To locate web elements on the page

B. To create a new browser instance for each test

C. To generate test reports automatically

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

Solution

1. Step 1: Understand the role of DataProvider

   @DataProvider is used to supply different sets of data to a test method so it can run multiple times with varied inputs.

2. Step 2: Compare options with this purpose

   Only To run the same test multiple times with different input data describes running the same test multiple times with different data, which matches the purpose of DataProvider.

3. Final Answer:

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

4. Quick Check:

   DataProvider = multiple test runs with data [OK]

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

Common Mistakes:

• Confusing DataProvider with browser setup
• Thinking DataProvider locates elements
• Assuming DataProvider generates reports

2. Which of the following is the correct syntax to declare a DataProvider method that reads data from an external CSV file?

easy

A. @DataProvider(name = "csvData")
public Object[][] getData() {
// code to read CSV and return Object[][]
}

B. @DataProvider
public void getData() {
// code to read CSV
}

C. @DataProvider(name = "csvData")
public void getData() {
return new Object[][] {};
}

D. @DataProvider(name = "csvData")
public Object getData() {
// code to read CSV
}

Solution

1. Step 1: Check DataProvider method signature

   A DataProvider method must return Object[][] and be public. @DataProvider(name = "csvData") public Object[][] getData() { // code to read CSV and return Object[][] } matches this.

2. Step 2: Verify other options

   @DataProvider public void getData() { // code to read CSV } returns void, which is invalid. @DataProvider(name = "csvData") public void getData() { return new Object[][] {}; } returns void but tries to return data, invalid. @DataProvider(name = "csvData") public Object getData() { // code to read CSV } returns Object, not Object[][], invalid.

3. Final Answer:

   @DataProvider(name = "csvData") public Object[][] getData() { // code to read CSV and return Object[][] } -> Option A

4. Quick Check:

   DataProvider method returns Object[][] [OK]

Hint: DataProvider must return Object[][] and be public [OK]

Common Mistakes:

• Using void return type for DataProvider
• Returning Object instead of Object[][]
• Missing @DataProvider annotation name

3. Given the following DataProvider method reading CSV data, what will be the output when the test runs?

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

@Test(dataProvider = "csvData")
public void loginTest(String username, String password) {
  System.out.println(username + ":" + password);
}

medium

A. user1
pass1
user2
pass2

B. user1:pass1
user2:pass2

C. user1pass1user2pass2

D. Compilation error due to DataProvider

Solution

1. Step 1: Understand DataProvider data structure

   The DataProvider returns two sets of data: {"user1", "pass1"} and {"user2", "pass2"}.

2. Step 2: Analyze test method output

   The test runs twice, printing username and password separated by a colon each time, resulting in two lines: "user1:pass1" and "user2:pass2".

3. Final Answer:

   user1:pass1 user2:pass2 -> Option B

4. Quick Check:

   Each data set prints username:password [OK]

Hint: Each data row runs test once, printing combined values [OK]

Common Mistakes:

• Expecting all data printed in one line
• Confusing array structure with output format
• Assuming compilation error without reason

4. Identify the error in this DataProvider method that reads data from a CSV file:

@DataProvider(name = "csvData")
public Object[][] getData() {
  List lines = readCsv("data.csv");
  Object[][] data = new Object[lines.size()][];
  for (int i = 0; i <= lines.size(); i++) {
    data[i] = lines.get(i);
  }
  return data;
}

medium

A. The loop condition should be < instead of <= to avoid IndexOutOfBoundsException

B. The method should return List instead of Object[][]

C. The DataProvider annotation is missing parameters

D. The data array size is incorrect and should be lines.size() + 1

Solution

1. Step 1: Analyze the for loop condition

   The loop runs from i = 0 to i <= lines.size(), which means it tries to access data[lines.size()] causing IndexOutOfBoundsException.

2. Step 2: Correct the loop condition

   The loop should run while i < lines.size() to stay within valid array indices.

3. Final Answer:

   The loop condition should be < instead of <= to avoid IndexOutOfBoundsException -> Option A

4. Quick Check:

   Loop index must be less than array size [OK]

Hint: Loop index must be less than array length, not less or equal [OK]

Common Mistakes:

• Using <= in loops causing index errors
• Returning wrong data type from DataProvider
• Misunderstanding DataProvider annotation usage

5. You want to use a DataProvider that reads test data from a CSV file and filters out rows where the first column is empty before running tests. Which approach correctly implements this?

hard

A. Return the entire CSV data as Object[][] without filtering, and filter inside the test method

B. Filter rows after test execution by skipping tests with empty first column

C. Read all CSV rows into a List, filter out rows with empty first column, then convert filtered list to Object[][] and return

D. Use a DataProvider that returns null for rows with empty first column

Solution

1. Step 1: Understand filtering before test execution

   Filtering data in the DataProvider ensures only valid data sets run tests, keeping tests clean and efficient.

2. Step 2: Implement filtering in DataProvider

   Read CSV into a list, remove rows with empty first column, then convert to Object[][] to supply filtered data to tests.

3. Final Answer:

   Read all CSV rows into a List, filter out rows with empty first column, then convert filtered list to Object[][] and return -> Option C

4. Quick Check:

   Filter data in DataProvider before tests run [OK]

Hint: Filter data inside DataProvider, not inside test method [OK]

Common Mistakes:

• Filtering data inside test method instead of DataProvider
• Returning null for filtered rows causing errors
• Skipping tests after execution instead of filtering input