RFR: JDK-8289509 : Improve test coverage for XPath Axes: descendant, descendant-or-self, following, following-sibling [v3]

[Mahendra Chhipa]

> Added test cases for xpath Axis:
> 1. descendant
> 2. descendant-or-self
> 3. following
> 4. following-sibling

Mahendra Chhipa has updated the pull request incrementally with one additional commit since the last revision:

  Added predicate tests.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10557/files
  - new: https://git.openjdk.org/jdk/pull/10557/files/5489dcf1..7dd36ecb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10557&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10557&range=01-02

  Stats: 25 lines in 2 files changed: 20 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/10557.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10557/head:pull/10557

PR: https://git.openjdk.org/jdk/pull/10557