RFR: 8284856: Add a test case for checking UnicodeScript entity numbers [v2]

[Naoto Sato]

> Added the test case, and eliminated the immediate hashmap value, replaced with the ordinal number of `Character.UnicodeScript.UNKNOWN`.

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  Fixed a typo

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8253/files
  - new: https://git.openjdk.java.net/jdk/pull/8253/files/31da445c..fc30fc9f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8253&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8253&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8253.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8253/head:pull/8253

PR: https://git.openjdk.java.net/jdk/pull/8253