Maven not running Spring Boot tests

The code in the class you named TestController isn't a controller, it's a test, but the convention says that it's a controller (perhaps used in testing). By default, Surefire will be looking for tests matching *Test; rename the class to ControllerTest.

Use the below maven jar. It fixed my issue.

<dependency>
    <groupId>org.junit.vintage</groupId>
    <artifactId>junit-vintage-engine</artifactId>
    <scope>test</scope>
</dependency>

try checking if you are using the correct package for @Test annotation. In Spring Boot 2.3.6 is org.junit.jupiter.api.Test