1 files changed, 39 insertions, 0 deletions
diff --git a/actionpack/test/controller/parameters/multi_parameter_attributes_test.rb b/actionpack/test/controller/parameters/multi_parameter_attributes_test.rb
new file mode 100644
index 0000000000..c890839727
--- /dev/null
+++ b/actionpack/test/controller/parameters/multi_parameter_attributes_test.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+require "action_controller/metal/strong_parameters"
+
+class MultiParameterAttributesTest < ActiveSupport::TestCase
+  test "permitted multi-parameter attribute keys" do
+    params = ActionController::Parameters.new(
+      book: {
+        "shipped_at(1i)"   => "2012",
+        "shipped_at(2i)"   => "3",
+        "shipped_at(3i)"   => "25",
+        "shipped_at(4i)"   => "10",
+        "shipped_at(5i)"   => "15",
+        "published_at(1i)" => "1999",
+        "published_at(2i)" => "2",
+        "published_at(3i)" => "5",
+        "price(1)"         => "R$",
+        "price(2f)"        => "2.02"
+      })
+
+    permitted = params.permit book: [ :shipped_at, :price ]
+
+    assert_predicate permitted, :permitted?
+
+    assert_equal "2012", permitted[:book]["shipped_at(1i)"]
+    assert_equal "3", permitted[:book]["shipped_at(2i)"]
+    assert_equal "25", permitted[:book]["shipped_at(3i)"]
+    assert_equal "10", permitted[:book]["shipped_at(4i)"]
+    assert_equal "15", permitted[:book]["shipped_at(5i)"]
+
+    assert_equal "R$", permitted[:book]["price(1)"]
+    assert_equal "2.02", permitted[:book]["price(2f)"]
+
+    assert_nil permitted[:book]["published_at(1i)"]
+    assert_nil permitted[:book]["published_at(2i)"]
+    assert_nil permitted[:book]["published_at(3i)"]
+  end
+end