test/rubygems: Try not only /usr/bin/env but also /bin/env

RubyGems chooses available one from the two: /usr/bin/env or /bin/env

https://github.com/rubygems/rubygems/blob/20b0d609484df2b514954ba9ef890a7cbdd01d18/lib/rubygems/installer.rb#L38

So, it is good not to hard-code /usr/bin/env in tests.

This is a retry of 65201c054a90c8e7beb8fe1e6d0006541ac33449 which was
accidentally deleted by 96064e6f1ce100a37680dc8f9509f06b3350e9c8

1 files changed, 12 insertions, 4 deletions

diff --git a/test/rubygems/test_gem_installer.rb b/test/rubygems/test_gem_installer.rb
index 9f531d4258..082e47205a 100644
--- a/test/rubygems/test_gem_installer.rb
+++ b/test/rubygems/test_gem_installer.rb
@@ -1824,9 +1824,9 @@ gem 'other', version
 
     shebang = installer.shebang 'executable'
 
-    env_shebang = "/usr/bin/env" unless Gem.win_platform?
+    bin_env = get_bin_env
 
-    assert_equal("#!#{env_shebang} #{RbConfig::CONFIG['ruby_install_name']}",
+    assert_equal("#!#{bin_env} #{RbConfig::CONFIG['ruby_install_name']}",
                  shebang)
   end
 
@@ -1905,10 +1905,18 @@ gem 'other', version
     assert_equal "#!test", shebang
   end
 
+  def get_bin_env
+    if win_platform?
+      ""
+    else
+      %w(/usr/bin/env /bin/env).find {|f| File.executable?(f) }
+    end
+  end
+
   def test_shebang_custom_with_expands
     installer = setup_base_installer
 
-    bin_env = win_platform? ? '' : '/usr/bin/env'
+    bin_env = get_bin_env
     conf = Gem::ConfigFile.new []
     conf[:custom_shebang] = '1 $env 2 $ruby 3 $exec 4 $name'
 
@@ -1924,7 +1932,7 @@ gem 'other', version
   def test_shebang_custom_with_expands_and_arguments
     installer = setup_base_installer
 
-    bin_env = win_platform? ? '' : '/usr/bin/env'
+    bin_env = get_bin_env
     conf = Gem::ConfigFile.new []
     conf[:custom_shebang] = '1 $env 2 $ruby 3 $exec'