Difference between junit-vintage-engine and junit-jupiter-engine?

Question

It's a two-fold question.

1. What is the difference between junit-vintage-engine and junit-jupiter-engine?
2. SpringBoot starter projects come with an exclusion for junit-vintage-engine. Is it to enforce the use of junit-jupiter-engine?

Below is the dependency of my SpringBoot project generated from Spring Initializr:

        <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
        <exclusions>
            <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

Answer 1

junit-vintage-engine is used for running JUnit 4 tests; junit-jupiter-engine for JUnit 5 tests.

Presumably since you'll be writing only JUnit 5 tests for a new Spring Boot project, the vintage engine won't be needed, hence the default dependency exclusion in the POM.

Reference:

https://junit.org/junit5/docs/current/user-guide