1 files changed, 24 insertions, 0 deletions
diff --git a/actionpack/test/controller/parameters/parameters_permit_test.rb b/actionpack/test/controller/parameters/parameters_permit_test.rb
index 79ce7bb3a7..7cc71fe6dc 100644
--- a/actionpack/test/controller/parameters/parameters_permit_test.rb
+++ b/actionpack/test/controller/parameters/parameters_permit_test.rb
@@ -32,15 +32,39 @@ class ParametersPermitTest < ActiveSupport::TestCase
     assert !@params.values_at(:person).first.permitted?
   end
 
+  test "permitted is sticky on accessors" do
+    @params.permit!
+    assert @params.slice(:person).permitted?
+    assert @params[:person][:name].permitted?
+    assert @params[:person].except(:name).permitted?
+
+    @params.each { |key, value| assert(value.permitted?) if key == "person" }
+
+    assert @params.fetch(:person).permitted?
+
+    assert @params.values_at(:person).first.permitted?
+  end
+
   test "not permitted is sticky on mutators" do
     assert !@params.delete_if { |k| k == "person" }.permitted?
     assert !@params.keep_if { |k,v| k == "person" }.permitted?
   end
 
+  test "permitted is sticky on mutators" do
+    @params.permit!
+    assert @params.delete_if { |k| k == "person" }.permitted?
+    assert @params.keep_if { |k,v| k == "person" }.permitted?
+  end
+
   test "not permitted is sticky beyond merges" do
     assert !@params.merge(a: "b").permitted?
   end
 
+  test "permitted is sticky beyond merges" do
+    @params.permit!
+    assert @params.merge(a: "b").permitted?
+  end
+
   test "modifying the parameters" do
     @params[:person][:hometown] = "Chicago"
     @params[:person][:family] = { brother: "Jonas" }