ruby/bootstraptest
Koichi Sasada 603ab70961 support concurrent btest execution
* `-j` option for concurrent test with threads
  * `-jN` uses N threads
  * `-j` uses nproc/2 threads
* Introduce `BT` struct to manage configurations
* Introduce `Assertion` to manage all assertions
* Remove all toplevel instance variables
* Show elapsed seconds at last

```
$ time make btest
...
real    0m37.319s
user    0m26.221s
sys     0m16.534s

$ time make btest TESTOPTS=-j
...
real    0m11.812s
user    0m36.667s
sys     0m21.872s
```
2022-02-06 03:05:47 +09:00
..
2020-04-27 10:39:07 +09:00
2022-02-06 03:05:47 +09:00
2022-01-10 10:53:31 -08:00