git: openjdk/skara: Improve testing of GitHub PositionMapper

[duke]

Changeset: 39f574e2
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2019-08-16 05:39:04 +0000
URL:       https://git.openjdk.java.net/skara/commit/39f574e2

Improve testing of GitHub PositionMapper

Reviewed-by: ehelin

! host/src/main/java/org/openjdk/skara/host/github/PositionMapper.java
+ host/src/test/java/org/openjdk/skara/host/github/PositionMapperTests.java