Maven does not run @BeforeEach Methods while running

By default Maven will not run the test with the Jupiter engine as

In order to have Maven Surefire run any tests at all, a TestEngine implementation must be added to the runtime classpath.

And this is not present by default.
So to enable it you have to configure the maven-surefire-plugin that runs the unit tests as documented in the Jupiter documentation :

UPDATE (28.10.2020):

Since version 2.22.0, you only have to specify a test dependency on the desired junit engine. Failing to do so, will also result in the behavior described in the question.

<dependencies>
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-engine</artifactId>
        <version>5.4.0</version>
        <scope>test</scope>
    </dependency>
</dependencies>

Keeping the original answer as a reference, before version 2.22.0 the solution was:

<build>
    <plugins>
        <plugin>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.21.0</version>
            <dependencies>
            <dependency>
                <groupId>org.junit.platform</groupId>
                <artifactId>junit-platform-surefire-provider</artifactId>
                <version>1.2.0</version>
            </dependency>
            <dependency>
                <groupId>org.junit.jupiter</groupId>
                <artifactId>junit-jupiter-engine</artifactId>
                <version>5.2.0</version>
            </dependency>
            </dependencies>
        </plugin>
    </plugins>
</build>

---

Whatever the issue is not necessarily easy to spot because Maven uses a runner that is able to run the Jupiter tests but didn't manage to execute the hook methods...

As a hint : to know whether the JUnit 5 runner is launched you can execute the tests with the verbose flag such as : mvn test -X.
If the Jupiter runner is used, you should find lines that look like :

[DEBUG] Surefire report directory: ...\target\surefire-reports

[DEBUG] Using configured provider org.junit.platform.surefire.provider.JUnitPlatformProvider

The first you need to do is to add a dependency like this:

<dependencies>
    [...]
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-engine</artifactId>
        <version>5.8.2</version>
        <scope>test</scope>
    </dependency>
    [...]
</dependencies>

The next thing is to use the most recent version of maven-surefire-plugin/maven-failsafe-plugin like this:

<build>
    <plugins>
        ...
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.22.2</version>
            <configuration>
                <excludes>
                    <exclude>some test to exclude here</exclude>
                </excludes>
            </configuration>
        </plugin>
    </plugins>
</build>

Starting with version 2.22.2 surefire supports JUnit 5...

Update:

• Use most recent version of maven-surefire/failsafe-plugin

maven-surefire-plugin by default takes all test classes which have the pattern *Test.java, in your case you should rename the class SomethingTest and it should be OK

https://maven.apache.org/surefire/maven-surefire-plugin/examples/inclusion-exclusion.html