1 files changed, 99 insertions, 0 deletions
diff --git a/actionpack/test/controller/parameters/mutators_test.rb b/actionpack/test/controller/parameters/mutators_test.rb
new file mode 100644
index 0000000000..744d8664be
--- /dev/null
+++ b/actionpack/test/controller/parameters/mutators_test.rb
@@ -0,0 +1,99 @@
+require 'abstract_unit'
+require 'action_controller/metal/strong_parameters'
+require 'active_support/core_ext/hash/transform_values'
+
+class ParametersMutatorsTest < ActiveSupport::TestCase
+  setup do
+    @params = ActionController::Parameters.new(
+      person: {
+        age: '32',
+        name: {
+          first: 'David',
+          last: 'Heinemeier Hansson'
+        },
+        addresses: [{city: 'Chicago', state: 'Illinois'}]
+      }
+    )
+  end
+
+  test "delete retains permitted status" do
+    @params.permit!
+    assert @params.delete(:person).permitted?
+  end
+
+  test "delete retains unpermitted status" do
+    assert_not @params.delete(:person).permitted?
+  end
+
+  test "delete_if retains permitted status" do
+    @params.permit!
+    assert @params.delete_if { |k| k == "person" }.permitted?
+  end
+
+  test "delete_if retains unpermitted status" do
+    assert_not @params.delete_if { |k| k == "person" }.permitted?
+  end
+
+  test "extract! retains permitted status" do
+    @params.permit!
+    assert @params.extract!(:person).permitted?
+  end
+
+  test "extract! retains unpermitted status" do
+    assert_not @params.extract!(:person).permitted?
+  end
+
+  test "keep_if retains permitted status" do
+    @params.permit!
+    assert @params.keep_if { |k,v| k == "person" }.permitted?
+  end
+
+  test "keep_if retains unpermitted status" do
+    assert_not @params.keep_if { |k,v| k == "person" }.permitted?
+  end
+
+  test "reject! retains permitted status" do
+    @params.permit!
+    assert @params.reject! { |k| k == "person" }.permitted?
+  end
+
+  test "reject! retains unpermitted status" do
+    assert_not @params.reject! { |k| k == "person" }.permitted?
+  end
+
+  test "select! retains permitted status" do
+    @params.permit!
+    assert @params.select! { |k| k != "person" }.permitted?
+  end
+
+  test "select! retains unpermitted status" do
+    assert_not @params.select! { |k| k != "person" }.permitted?
+  end
+
+  test "slice! retains permitted status" do
+    @params.permit!
+    assert @params.slice!(:person).permitted?
+  end
+
+  test "slice! retains unpermitted status" do
+    assert_not @params.slice!(:person).permitted?
+  end
+
+  test "transform_keys! retains permitted status" do
+    @params.permit!
+    assert @params.transform_keys! { |k| k }.permitted?
+  end
+
+  test "transform_keys! retains unpermitted status" do
+    assert_not @params.transform_keys! { |k| k }.permitted?
+  end
+
+  test "transform_values! retains permitted status" do
+    @params.permit!
+    assert @params.transform_values! { |v| v }.permitted?
+  end
+
+  test "transform_values! retains unpermitted status" do
+    assert_not @params.transform_values! { |v| v }.permitted?
+  end
+end