RFR: 8315960: test/jdk/java/io/File/TempDirDoesNotExist.java leaves test files behind [v9]

[Brian Burkhalter]

> Add a `finally` block to delete the created files.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8315960: Use assertEquals

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15757/files
  - new: https://git.openjdk.org/jdk/pull/15757/files/b3ac8c7b..cc4a3369

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15757&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15757&range=07-08

  Stats: 9 lines in 1 file changed: 1 ins; 2 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/15757.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15757/head:pull/15757

PR: https://git.openjdk.org/jdk/pull/15757