Data-driven testing using the JUnit unit testing framework

The JUnit unit testing framework supports data-driven testing, using reusable data sources to dynamically run test cases. Steps include: Create a test data source, such as a CSV file. Create a test class and specify the data source using @RunWith(Parameterized.class) and @Parameters. Write test methods and inject data using @Test and @Parameter. Use Parameterized annotations to automatically traverse data sources and inject test data.

Using JUnit unit testing framework for data-driven testing

Data-driven testing is an automated testing technology that can be repeated through Use the data source to dynamically run test cases. JUnit is a widely used Java unit testing framework that provides support for data-driven testing.

Steps

1. Create a test data source

First, create a class or text file to Store test data. Can use CSV, JSON or other formats. For example:

// data.csv
name,age
John,25
Mary,30

2. Create a test class

Create a test class for the class to be tested and specify it using the Parameterized annotation Data source path:

@RunWith(Parameterized.class)
public class DataDrivenTest {

    @Parameter
    public String name;

    @Parameter(1)
    public int age;

    @Parameters
    public static Iterable<Object[]> data() {
        return new CsvFileSource(new File("data.csv"));
    }
}

Parameterized annotation will automatically iterate through each row in the data source and inject the value into the test method using the @Parameter annotation.

3. Write a test method

Write a test method using the @Test annotation and use the injected data in it:

@Test
public void testNameAndAge() {
    assertEquals("John", name);
    assertTrue(age == 25);
}

Practical Case

To show data-driven testing in action, let’s test a simple User class that contains name and age fields:

public class User {

    private String name;
    private int age;
    
    // getters and setters
}

@RunWith(Parameterized.class)
public class UserTest {

    @Parameter
    public String name;

    @Parameter(1)
    public int age;

    @Parameters
    public static Iterable<Object[]> data() {
        return new CsvFileSource(new File("data.csv"));
    }

    @Test
    public void testUser() {
        User user = new User();
        user.setName(name);
        user.setAge(age);
        assertEquals(name, user.getName());
        assertTrue(age == user.getAge());
    }
}

After running the test, JUnit will automatically iterate through each row in the data.csv file and run ## with those values #testUser() method.

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