in maven-plugin-testing-harness/src/main/java/org/apache/maven/plugin/testing/ArtifactStubFactory.java [318:326]
public Set<Artifact> getScopedArtifacts() throws IOException {
Set<Artifact> set = new HashSet<>();
set.add(createArtifact("g", "compile", "1.0", Artifact.SCOPE_COMPILE));
set.add(createArtifact("g", "provided", "1.0", Artifact.SCOPE_PROVIDED));
set.add(createArtifact("g", "test", "1.0", Artifact.SCOPE_TEST));
set.add(createArtifact("g", "runtime", "1.0", Artifact.SCOPE_RUNTIME));
set.add(createArtifact("g", "system", "1.0", Artifact.SCOPE_SYSTEM));
return set;
}