Appease credo

lib/content_security_policy/plug/add_source_value.ex

@@ -35,6 +35,7 @@ defmodule ContentSecurityPolicy.Plug.AddSourceValue do
   alias ContentSecurityPolicy.Directive
   alias ContentSecurityPolicy.Policy
 
+  def init([]), do: raise_no_arguments_error()
   def init(opts) do
     Enum.each(opts, fn {directive, _source_value} ->
       Directive.validate_directive!(directive)
@@ -69,7 +70,7 @@ defmodule ContentSecurityPolicy.Plug.AddSourceValue do
     """
   end
 
-  defp raise_no_arguments_error() do
+  defp raise_no_arguments_error do
     raise ArgumentError, """
     No directive and source value supplied to the
     `ContentSecurityPolicy.Plug.AddSourceValue` plug.

test/content_security_policy/plug/add_source_value_test.exs

@@ -18,7 +18,7 @@ defmodule ContentSecurityPolicy.Plug.AddSourceValueTest do
 
   describe "call/2" do
     property "adds source values to corresponding directives" do
-      check all valid_directives_with_source_values <- 
+      check all valid_directives_with_source_values <-
         TestHelpers.list_of_valid_directive_source_value_pairs_generator()
       do
         conn = send_response(valid_directives_with_source_values)
@@ -31,18 +31,18 @@ defmodule ContentSecurityPolicy.Plug.AddSourceValueTest do
           assert {:ok, regex_for_this_pair} = Regex.compile(match)
           assert csp_header =~ regex_for_this_pair
         end)
-      end     
+      end
     end
 
     test "raises an error if given an invalid directive" do
       assert_raise(ArgumentError, ~r/Invalid directive/, fn ->
-        conn = send_response(not_a_directive: "doesnt matter")
+        send_response(not_a_directive: "doesnt matter")
       end)
     end
 
     test "raises an error if given no directive source value pairs" do
       assert_raise(ArgumentError, ~r/No directive and source value supplied/, fn ->
-        conn = send_response([])
+        send_response([])
       end)
     end
   end