1 files changed, 106 insertions, 0 deletions
diff --git a/activemodel/test/cases/attribute_assignment_test.rb b/activemodel/test/cases/attribute_assignment_test.rb
new file mode 100644
index 0000000000..5c1be6a456
--- /dev/null
+++ b/activemodel/test/cases/attribute_assignment_test.rb
@@ -0,0 +1,106 @@
+require 'cases/helper'
+require 'active_support/hash_with_indifferent_access' 
+
+class AttributeAssignmentTest < ActiveModel::TestCase
+
+  class Model
+    include ActiveModel::AttributeAssignment
+
+    attr_accessor :name, :description
+
+    def initialize(attributes = {})
+      assign_attributes(attributes)
+    end
+
+    def broken_attribute=(value)
+      non_existing_method(value)
+    end
+
+    private
+    def metadata=(data)
+      @metadata = data
+    end
+  end
+
+  class ProtectedParams < ActiveSupport::HashWithIndifferentAccess
+    def permit!
+      @permitted = true
+    end
+
+    def permitted?
+      @permitted ||= false
+    end
+
+    def dup
+      super.tap do |duplicate|
+        duplicate.instance_variable_set :@permitted, permitted?
+      end
+    end
+  end
+
+  test "simple assignment" do
+    model = Model.new
+
+    model.assign_attributes(name: 'hello', description: 'world')
+    assert_equal 'hello', model.name
+    assert_equal 'world', model.description
+  end
+
+  test "assign non-existing attribute" do
+    model = Model.new
+    error = assert_raises ActiveModel::AttributeAssignment::UnknownAttributeError do
+      model.assign_attributes(hz: 1)
+    end
+
+    assert_equal model, error.record
+    assert_equal "hz", error.attribute
+  end
+
+  test "assign private attribute" do
+    model = Model.new
+    assert_raises ActiveModel::AttributeAssignment::UnknownAttributeError do
+      model.assign_attributes(metadata: { a: 1 })
+    end
+  end
+
+  test "raises NoMethodError if raised in attribute writer" do
+    assert_raises NoMethodError do
+      Model.new(broken_attribute: 1)
+    end
+  end
+
+  test "raises ArgumentError if non-hash object passed" do
+    assert_raises ArgumentError do
+      Model.new(1)
+    end
+  end
+
+  test 'forbidden attributes cannot be used for mass assignment' do
+    params = ProtectedParams.new(name: 'Guille', description: 'm')
+    assert_raises(ActiveModel::ForbiddenAttributesError) do
+      Model.new(params)
+    end
+  end
+
+  test 'permitted attributes can be used for mass assignment' do
+    params = ProtectedParams.new(name: 'Guille', description: 'desc')
+    params.permit!
+    model = Model.new(params)
+
+    assert_equal 'Guille', model.name
+    assert_equal 'desc', model.description
+  end
+
+  test 'regular hash should still be used for mass assignment' do
+    model = Model.new(name: 'Guille', description: 'm')
+
+    assert_equal 'Guille', model.name
+    assert_equal 'm', model.description
+  end
+
+  test 'blank attributes should not raise' do
+    model = Model.new
+    assert_nil model.assign_attributes(ProtectedParams.new({}))
+  end
+
+end