testing_env: extract with_environment to helper module

1 files changed, 15 insertions, 0 deletions

diff --git a/Library/Homebrew/test/helper/env.rb b/Library/Homebrew/test/helper/env.rb
new file mode 100644
index 000000000..904a1d4c7
--- /dev/null
+++ b/Library/Homebrew/test/helper/env.rb
@@ -0,0 +1,15 @@
+module Test
+  module Helper
+    module Env
+      def with_environment(partial_env)
+        old = ENV.to_hash
+        ENV.update partial_env
+        begin
+          yield
+        ensure
+          ENV.replace old
+        end
+      end
+    end
+  end
+end