https://git.ruby-lang.org/ruby.git/commit/?id=5086c25f60

From 5086c25f6015558877f85c3f1c014780b08fd3ce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=ADt=20Ondruch?= <vondruch@r...>
Date: Thu, 21 Oct 2021 13:02:38 +0200
Subject: Properly exclude test cases.

Lets consider the following scenario:

~~~
irb(#<Test::Unit::AutoRunner::Runner:0x0000560f68afc3c8>):001:0> p suite
OpenSSL::TestEC
=> OpenSSL::TestEC

irb(#<Test::Unit::AutoRunner::Runner:0x0000560f68afc3c8>):002:0> p all_test_methods
["test_ECPrivateKey", "test_ECPrivateKey_encrypted", "test_PUBKEY", "test_check_key", "test_derive_key", "test_dh_compute_key", "test_dsa_sign_asn1_FIPS186_3", "test_ec_group", "test_ec_key", "test_ec_point", "test_ec_point_add", "test_ec_point_mul", "test_generate", "test_marshal", "test_sign_verify", "test_sign_verify_raw"]
=>
["test_ECPrivateKey",
 "test_ECPrivateKey_encrypted",
 "test_PUBKEY",
 "test_check_key",
 "test_derive_key",
 "test_dh_compute_key",
 "test_dsa_sign_asn1_FIPS186_3",
 "test_ec_group",
 "test_ec_key",
 "test_ec_point",
 "test_ec_point_add",
 "test_ec_point_mul",
 "test_generate",
 "test_marshal",
 "test_sign_verify",
 "test_sign_verify_raw"]

irb(#<Test::Unit::AutoRunner::Runner:0x0000560f68afc3c8>):003:0> p filter
/\A(?=.*)(?!.*(?-mix:(?-mix:memory_leak)|(?-mix:OpenSSL::TestEC.test_check_key)))/
=> /\A(?=.*)(?!.*(?-mix:(?-mix:memory_leak)|(?-mix:OpenSSL::TestEC.test_check_key)))/

irb(#<Test::Unit::AutoRunner::Runner:0x0000560f68afc3c8>):004:0> method = "test_check_key"
=> "test_check_key"
~~~

The intention here is to exclude the `test_check_key` test case.
Unfortunately this does not work as expected, because the negative filter
is never checked:

~~~
irb(#<Test::Unit::AutoRunner::Runner:0x0000560f68afc3c8>):005:0> filter === method
=> true

irb(#<Test::Unit::AutoRunner::Runner:0x0000560f68afc3c8>):006:0> filter === "#{suite}##{method}"
=> false

irb(#<Test::Unit::AutoRunner::Runner:0x0000560f68afc3c8>):007:0> filter === method || filter === "#{suite}##{method}"
=> true
~~~

Therefore always filter against the fully qualified method name
`#{suite}##{method}`, which should provide the expected result.

However, if plain string filter is used, keep checking also only the
method name.

This resolves [Bug #16936].
---
 tool/lib/test/unit.rb | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tool/lib/test/unit.rb b/tool/lib/test/unit.rb
index c58a609bfa0..0482c8073fb 100644
--- a/tool/lib/test/unit.rb
+++ b/tool/lib/test/unit.rb
@@ -1497,9 +1497,15 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit.rb#L1497
 
         all_test_methods = suite.send "#{type}_methods"
         if filter
-          all_test_methods.select! {|method|
-            filter === method || filter === "#{suite}##{method}"
-          }
+          if Regexp === filter
+            all_test_methods.select! {|method|
+              filter === "#{suite}##{method}"
+            }
+          else
+            all_test_methods.select! {|method|
+              filter === method || filter === "#{suite}##{method}"
+            }
+          end
         end
         all_test_methods = @order.sort_by_name(all_test_methods)
 
-- 
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