[ruby-core:111017] [Ruby master Misc#19142] Run test suites against 'install', based on ENV variable?

Issue #19142 has been updated by nobu (Nobuyoshi Nakada).


I think that `test` needs `install` only when "preloadenv" and `--enable-load-relative` can't work.
At least `test-all` can run as `/install/bin/ruby test/runner.rb`, I think.

----------------------------------------
Misc #19142: Run test suites against 'install', based on ENV variable?
https://bugs.ruby-lang.org/issues/19142#change-100270

* Author: MSP-Greg (Greg L)
* Status: Open
* Priority: Normal
----------------------------------------
Some time ago I believe there was discussion about:

```
make
make test
make install
```

vs

```
make
make install
make test
```

Some people preferred to not have to run install before test (disk space, time, etc).

Might an environment variable like `RUBY_TEST_FROM_INSTALL` or `RUBY_TEST_FROM_PATH` be
added that would trigger the test suite to test against the Ruby install folder or the
Ruby in PATH?

I believe a handful of files in the test system would need changes, as they load files
using `require_relative`...

I think spec/mspec is already setup to do so.




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