[jdk11u-dev] RFR: 8289508: Improve test coverage for XPath Axes: ancestor, ancestor-or-self, preceding, and preceding-sibling

[Goetz Lindenmaier]

I backport this for parity with 11.0.20-oracle.

I had to edit the """ strings.

-------------

Commit messages:
 - Backport caae53f4dadd146426a1a2cd121ac00bb98ebc97

Changes: https://git.openjdk.org/jdk11u-dev/pull/1993/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1993&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289508
  Stats: 371 lines in 2 files changed: 371 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1993.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1993/head:pull/1993

PR: https://git.openjdk.org/jdk11u-dev/pull/1993