Careeroza

Real World Example

Reading Test Data from Text

Real projects keep test data outside the code, in CSV or Excel files. Here a text block stands in for a CSV file of login data. The program splits each line and decides the expected result, exactly like a data-driven test does before calling Selenium.

Example

Parse a CSV of login test data:

import java.util.*;

public class Main {
    public static void main(String[] args) {
        String csv = """
            email,password,expected
            [email protected],Test@123,success
            [email protected],wrong,error
            ,Test@123,error
            """;
        List<String> lines = csv.lines().toList();
        for (int i = 1; i < lines.size(); i++) {           // skip header
            String[] cols = lines.get(i).split(",", -1);
            String email = cols[0].isEmpty() ? "(blank)" : cols[0];
            System.out.printf("Row %d: email=%-15s password=%-9s expected=%s%n", i, email, cols[1], cols[2]);
        }
        System.out.println("Data rows: " + (lines.size() - 1));
    }
}

Output

Row 1: [email protected]  password=Test@123  expected=success
Row 2: [email protected]  password=wrong     expected=error
Row 3: email=(blank)         password=Test@123  expected=error
Data rows: 3

Why This Matters

At banks and insurance companies, one login test often runs with 50 rows of data (valid users, locked users, expired passwords, special characters). The Java skills on this module's pages are exactly what you need to read and loop through that data.