https://git.ruby-lang.org/ruby.git/commit/?id=d7f100226d

From d7f100226d41df364b048c7956b5140922970e9a Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Sat, 23 Nov 2019 01:29:53 +0900
Subject: Skip test_validate_gemspec when tarball and git installed too

`git --version` failed as expected when git is not installed,
but unexpectedly pass when git installed and pwd is not in git working directory.
So use `git rev-parse` instead, and it failed when git installed too.

diff --git a/test/ruby/test_default_gems.rb b/test/ruby/test_default_gems.rb
index f29b17f..3c4aea1 100644
--- a/test/ruby/test_default_gems.rb
+++ b/test/ruby/test_default_gems.rb
@@ -4,7 +4,7 @@ require 'rubygems' https://github.com/ruby/ruby/blob/trunk/test/ruby/test_default_gems.rb#L4
 class TestDefaultGems < Test::Unit::TestCase
 
   def test_validate_gemspec
-    skip "git not found" unless system("git", "--version", %i[out err]=>IO::NULL)
+    skip "git not found" unless system("git", "rev-parse", %i[out err]=>IO::NULL)
     srcdir = File.expand_path('../../..', __FILE__)
     Dir.glob("#{srcdir}/{lib,ext}/**/*.gemspec").map do |src|
       assert_nothing_raised do
-- 
cgit v0.10.2


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