added <plugin>
                      <groupId>org.apache.maven.plugins</groupId>
                      <artifactId>maven-surefire-plugin</artifactId>
                      <version>2.18.1</version>
                      <configuration>
                          <enableAssertions>true</enableAssertions>
                      </configuration>
                  </plugin>
Merge remote-tracking branch 'origin/master'