1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/core/struct/element_set_spec.rb b/spec/ruby/core/struct/element_set_spec.rb
new file mode 100644
index 0000000000..0a0e34a5ee
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+++ b/spec/ruby/core/struct/element_set_spec.rb
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+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Struct#[]=" do
+  it "assigns the passed value" do
+    car = StructClasses::Car.new('Ford', 'Ranger')
+
+    car[:model] = 'Escape'
+    car[:model].should == 'Escape'
+
+    car['model'] = 'Fusion'
+    car[:model].should == 'Fusion'
+
+    car[1] = 'Excursion'
+    car[:model].should == 'Excursion'
+
+    car[-1] = '2000-2005'
+    car[:year].should == '2000-2005'
+  end
+
+  it "fails when trying to assign attributes which don't exist" do
+    car = StructClasses::Car.new('Ford', 'Ranger')
+
+    -> { car[:something] = true }.should raise_error(NameError)
+    -> { car[3] = true          }.should raise_error(IndexError)
+    -> { car[-4] = true         }.should raise_error(IndexError)
+    -> { car[Object.new] = true }.should raise_error(TypeError)
+  end
+
+  it "raises a FrozenError on a frozen struct" do
+    car = StructClasses::Car.new('Ford', 'Ranger')
+    car.freeze
+
+    -> { car[:model] = 'Escape' }.should raise_error(FrozenError)
+  end
+end