fix: test_create_cache_if_dir_not_exit nerver passes once executed

[keroxp]

This test doesn't remove created directory after test. It will fail on next run.

   Compiling deno v0.39.0 (/Users/keroxp/src/deno/cli)
   Compiling test_plugin v0.0.1 (/Users/keroxp/src/deno/test_plugin)
    Finished test [unoptimized + debuginfo] target(s) in 28.69s
     Running target/debug/deps/deno-dadb83997376169a

running 1 test
test disk_cache::tests::test_create_cache_if_dir_not_exits ... FAILED

failures:

---- disk_cache::tests::test_create_cache_if_dir_not_exits stdout ----
thread 'disk_cache::tests::test_create_cache_if_dir_not_exits' panicked at 'assertion failed: `(left == right)`
  left: `true`,
 right: `false`', cli/disk_cache.rs:154:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    disk_cache::tests::test_create_cache_if_dir_not_exits

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 220 filtered out

[Drunpy]

Good catch! I've missed that due to have run the tests in different machines at the time.
Thanks.

[bartlomieju]

If you use TempDir::new() then there's no need to remove the directory before the test

[keroxp]

I did for checking ::new creates directories recursively. The reason to create temp dir is to get safe path that can contain sub directory.

[ry]

LGTM - thanks @kt3k