https://git.ruby-lang.org/ruby.git/commit/?id=7bf51ced55

From 7bf51ced5571d6180722f2be1b50c048a02b2e70 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Tue, 29 Oct 2019 14:34:31 +0900
Subject: test/rubygems/test_gem.rb: early failure when there is /tmp/Gemfile

Some test cases in rubygems assume that /tmp/Gemfile does not exist.
If it does, they fail with very difficult-to-understand message:

```
[ 149/2108] TestGemBundlerVersionFinder#test_bundler_version_with_bundle_update_bundler = 0.00
  1) Failure:
TestGemBundlerVersionFinder#test_bundler_version_with_bundle_update_bundler [/home/mame/work/ruby/test/rubygems/test_gem_bundler_version_finder.rb:38]:
Expected Gem::Version.new("2.0.2") to be nil.
```

I spent one hour to debug this issue.  To prevent the same accident,
this change makes the test suite stop when /tmp/Gemfile explicitly.

diff --git a/test/rubygems/test_gem.rb b/test/rubygems/test_gem.rb
index 110eef6..23f8249 100644
--- a/test/rubygems/test_gem.rb
+++ b/test/rubygems/test_gem.rb
@@ -7,6 +7,10 @@ require 'pathname' https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_gem.rb#L7
 require 'tmpdir'
 require 'rbconfig'
 
+if File.exist?(File.join(Dir.tmpdir, "Gemfile"))
+  raise "rubygems/bundler tests do not work correctly if there is #{ File.join(Dir.tmpdir, "Gemfile") }"
+end
+
 # TODO: push this up to test_case.rb once battle tested
 
 $LOAD_PATH.map! do |path|
-- 
cgit v0.10.2


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