1 files changed, 32 insertions, 0 deletions
diff --git a/railties/test/env_helpers.rb b/railties/test/env_helpers.rb
new file mode 100644
index 0000000000..336832b867
--- /dev/null
+++ b/railties/test/env_helpers.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require "rails"
+
+module EnvHelpers
+  private
+
+    def with_rails_env(env)
+      Rails.instance_variable_set :@_env, nil
+      switch_env "RAILS_ENV", env do
+        switch_env "RACK_ENV", nil do
+          yield
+        end
+      end
+    end
+
+    def with_rack_env(env)
+      Rails.instance_variable_set :@_env, nil
+      switch_env "RACK_ENV", env do
+        switch_env "RAILS_ENV", nil do
+          yield
+        end
+      end
+    end
+
+    def switch_env(key, value)
+      old, ENV[key] = ENV[key], value
+      yield
+    ensure
+      ENV[key] = old
+    end
+end