propagate environment variables to surefire run

[lkwg82]

added propagation of environment variables to underlying java processes …
here is an example to pass Xvfb-Display to the pitest runs

                  <plugins>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-jar-plugin</artifactId>
                        <executions>
                            <execution>
                                <id>default-jar</id>
                                <phase>never</phase>
                            </execution>
                        </executions>
                    </plugin>

                    <plugin>
                        <groupId>org.codehaus.mojo</groupId>
                        <artifactId>selenium-maven-plugin</artifactId>
                        <version>2.3</version>
                        <executions>
                            <execution>
                                <id>start</id>
                                <phase>pre-integration-test</phase>
                                <goals>
                                    <goal>xvfb</goal>
                                </goals>
                                <configuration>
                                    <background>true</background>
                                    <display>:${xvfb.display}</display>
                                    <options>
                                        <option>-listen</option>
                                        <option>tcp</option>
                                        <option>-port</option>
                                        <option>60${xvfb.display}</option>
                                    </options>
                                </configuration>
                            </execution>
                        </executions>
                    </plugin>

                    <plugin>
                        <groupId>org.pitest</groupId>
                        <artifactId>pitest-maven</artifactId>
                        <version>1.1.6-SNAPSHOT</version>
                        <configuration>
                            <environmentVariables>
                                <DISPLAY>:${xvfb.display}</DISPLAY>
                            </environmentVariables>
                            ...
                        </configuration>
                        <executions>
                            <execution>
                                <phase>integration-test</phase>
                                <goals>
                                    <goal>mutationCoverage</goal>
                                </goals>
                            </execution>
                        </executions>
                    </plugin>
                </plugins>

[hcoles]

@lkwg82 Thanks for this - the tests look to be failing due to mixed use of matchers and value with mockito.

I wonder how this should interact with the surefire integration introduced in #173?

Should the environment variables explicitly set in the pitest config overwrite those in surefire, or be appended to them?

[lkwg82]

Fixed it. I ran out of time yesterday and missed it.