RELATIVE_PREVIOUS breaks tests on Multi Maven Projects

[MTocchettoP]

Problem Class:
https://github.com/wso2/maven-tools/blob/master/wso2-synapse-unit-test-plugin/src/main/java/org/wso2/synapse/unittest/SynapseTestCaseFileReader.java

Problem Code:
Line 126:

testArtifactFileAsString = FileUtils.readFileToString(
                    new File(RELATIVE_PREVIOUS + File.separator +  testArtifactFilePath));

Problem:
When executing a unit test the xml being tested is not found because the path is wrong. The addition of RELATIVE_PREVIOUS to the artifact path makes the path unusable.

Here is my project structure:
-WSO2HelloWorldPipeline
--pom.xml (parent)
--HelloWorld
---pom.xml
--HelloWorldCompositeApplication
---pom.xml

The following is the artifact path as exposed by String testArtifactFilePath = testArtifactFileNode.getText();

\HelloWorld\src\main\synapse-config\api\helloWorld.xml

When line 126 adds the ..\ to it, as you can see from the structure above, the path becomes invalid.

I am not sure what's the point of having that relative marker in the code, in a multi maven project any build command will be running from the parent anyway. I think I can work around the issue by using a maven-exec and moving folders before the test fires up but that's a workaround and this feels like a bug.