<profile>
      <id>exists-project-version</id>
      <activation>
        <file>
          <exists>${project.version}/test.txt</exists>
        </file>
      </activation>
    </profile>
    <profile>
      <id>missing-project-version</id>
      <activation>
        <file>
          <missing>${project.version}/test.txt</missing>
        </file>
      </activation>
    </profile>

  </profiles>

      <activation>
        <file>
          <exists>${project.basedir}/test.txt</exists>
        </file>
      </activation>
    </profile>
    <profile>
      <id>missing-project-basedir</id>
      <activation>
        <file>
          <missing>${project.basedir}/test.txt</missing>
        </file>
      </activation>
    </profile>

    <profile>
      <id>dynamic-property-available</id>
      <activation>

      <activation>
        <property>
          <name>${project.version}</name>
        </property>
      </activation>
    </profile>
    <profile>
      <id>property-value-project-version</id>
      <activation>
        <property>
          <name>project.version</name>
          <value>${project.version}</value>
        </property>
      </activation>
    </profile>

  </profiles>

        Profile osActivated = new Profile();
        osActivated.setId( "os-profile" );

        Activation osActivation = new Activation();

        ActivationOS activationOS = new ActivationOS();

        activationOS.setName( "!dddd" );

        osActivation.setOs( activationOS );

        osActivated.setActivation( osActivation );

        Properties props = System.getProperties();

    public boolean canDetermineActivation(Profile profile) {
        Activation activation = profile.getActivation();
        return activation != null && activation.getOs() != null;
    }

    public boolean isActive(Profile profile) {
        Activation activation = profile.getActivation();
        ActivationOS os = activation.getOs();

        boolean result = ensureAtLeastOneNonNull(os);

        Activation activation = profile.getActivation();

        if (activation == null) {
            return false;
        }

        ActivationOS os = activation.getOs();

        return os != null;
    }

    private boolean ensureAtLeastOneNonNull(ActivationOS os) {

        }
        return isActive;
    }

    private boolean isActiveByDefault(Profile profile) {
        Activation activation = profile.getActivation();
        return activation != null && activation.isActiveByDefault();
    }

        final ActivationSettings settings = ActivationSettings.of(active, optional);
        this.activations.add(new ProjectActivationSettings(selector, settings));
    }

    private Stream<ProjectActivationSettings> getProjects(final Predicate<ActivationSettings> predicate) {
        return this.activations.stream().filter(activation -> predicate.test(activation.activationSettings));
    }

    @Override
    @BeforeEach
    void setUp() throws Exception {
        activator = new OperatingSystemProfileActivator();
    }

    private Profile newProfile(ActivationOS.Builder activationBuilder) {
        Activation a = Activation.newBuilder().os(activationBuilder.build()).build();

        Profile p = Profile.newBuilder().activation(a).build();

        return p;
    }

/**
 * Tests {@code Activation}.
 *
 */
class ActivationTest {

    @Test
    void testHashCodeNullSafe() {
        new Activation().hashCode();
    }

    @Test
    void testEqualsNullSafe() {
        assertFalse(new Activation().equals(null));

        new Activation().equals(new Activation());
    }

    @Test
    void testEqualsIdentity() {