Improved in-test config management functions.

test/support/helpers.ex

@@ -26,6 +26,25 @@ defmodule Pleroma.Tests.Helpers do
     end
   end
 
+  defmacro clear_config(config_path, temp_setting) do
+    quote do
+      clear_config(unquote(config_path)) do
+        Config.put(unquote(config_path), unquote(temp_setting))
+      end
+    end
+  end
+
+  @doc """
+  From _within a test case_, sets config to provided value and restores initial value on exit.
+  For multi-case setup use `clear_config/2` instead.
+  """
+  def set_config(config_path, temp_setting) do
+    initial_setting = Config.get(config_path)
+    Config.put(config_path, temp_setting)
+
+    ExUnit.Callbacks.on_exit(fn -> Config.put(config_path, initial_setting) end)
+  end
+
   @doc "Stores initial config value and restores it after *all* test examples are executed."
   defmacro clear_config_all(config_path) do
     quote do
@@ -50,6 +69,14 @@ defmodule Pleroma.Tests.Helpers do
     end
   end
 
+  defmacro clear_config_all(config_path, temp_setting) do
+    quote do
+      clear_config_all(unquote(config_path)) do
+        Config.put(unquote(config_path), unquote(temp_setting))
+      end
+    end
+  end
+
   defmacro __using__(_opts) do
     quote do
       import Pleroma.Tests.Helpers,
@@ -57,7 +84,8 @@ defmodule Pleroma.Tests.Helpers do
           clear_config: 1,
           clear_config: 2,
           clear_config_all: 1,
-          clear_config_all: 2
+          clear_config_all: 2,
+          set_config: 2
         ]
 
       def to_datetime(naive_datetime) do