https://git.ruby-lang.org/ruby.git/commit/?id=70a9328b79

From 70a9328b791f46a16e0f2d85db28b893a6ceed5b Mon Sep 17 00:00:00 2001
From: Matt Valentine-House <matt@e...>
Date: Wed, 27 Jul 2022 13:18:25 +0100
Subject: [ci-skip]Document how to run an individual bootstrap test

---
 doc/contributing/testing_ruby.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/contributing/testing_ruby.md b/doc/contributing/testing_ruby.md
index dd46ba5dbc..ecdb152926 100644
--- a/doc/contributing/testing_ruby.md
+++ b/doc/contributing/testing_ruby.md
@@ -20,6 +20,12 @@ We can run any of the make scripts [in parallel](building_ruby.md#label-Running+ https://github.com/ruby/ruby/blob/trunk/doc/contributing/testing_ruby.md#L20
     make btest OPTS=-v
     ```
 
+    To run an individual bootstrap test, we can set the filename in the environment variable `BTESTS`:
+
+    ```
+    make btest BTESTS=bootstraptest/test_gc.rb
+    ```
+
     If we want to run the bootstrap test suite on Ruby (not Miniruby), we can use:
 
     ```
-- 
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