More environment filtering tweaks

- only document HOMEBREW_* variables in the manpage (although still
  read from all the original environment variables).
- resort manpage environment variables in alphabetical order
- check the original path for trailing slashes

1 files changed, 1 insertions, 1 deletions

diff --git a/Library/Homebrew/test/diagnostic_spec.rb b/Library/Homebrew/test/diagnostic_spec.rb
index 12a8e0c42..c4373671e 100644
--- a/Library/Homebrew/test/diagnostic_spec.rb
+++ b/Library/Homebrew/test/diagnostic_spec.rb
@@ -7,7 +7,7 @@ describe Homebrew::Diagnostic::Checks do
   end
 
   specify "#check_path_for_trailing_slashes" do
-    ENV["PATH"] += File::PATH_SEPARATOR + "/foo/bar/"
+    ENV["HOMEBREW_PATH"] += File::PATH_SEPARATOR + "/foo/bar/"
     expect(subject.check_path_for_trailing_slashes)
       .to match("Some directories in your path end in a slash")
   end