diff --git a/Library/Homebrew/dev-cmd/tests.rb b/Library/Homebrew/dev-cmd/tests.rb
index 3edc12ed5b..c544b36104 100644
--- a/Library/Homebrew/dev-cmd/tests.rb
+++ b/Library/Homebrew/dev-cmd/tests.rb
@@ -38,6 +38,7 @@ module Homebrew
       ENV.delete("VERBOSE")
       ENV.delete("HOMEBREW_CASK_OPTS")
       ENV.delete("HOMEBREW_TEMP")
+      ENV.delete("HOMEBREW_LINKAGE_CACHE")
       ENV["HOMEBREW_NO_ANALYTICS_THIS_RUN"] = "1"
       ENV["HOMEBREW_DEVELOPER"] = "1"
       ENV["HOMEBREW_NO_COMPAT"] = "1" if args.no_compat?
diff --git a/Library/Homebrew/test/spec_helper.rb b/Library/Homebrew/test/spec_helper.rb
index 97195fe819..eef774b48f 100644
--- a/Library/Homebrew/test/spec_helper.rb
+++ b/Library/Homebrew/test/spec_helper.rb
@@ -43,8 +43,8 @@ RSpec.configure do |config|
 
   config.filter_run_when_matching :focus
 
-  # TODO when https://github.com/rspec/rspec-expectations/pull/1056 makes
-  # it into a stable release:
+  # TODO: when https://github.com/rspec/rspec-expectations/pull/1056
+  #       makes it into a stable release:
   # config.expect_with :rspec do |c|
   #   c.max_formatted_output_length = 200
   # end