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-rw-r--r--spec/ruby/core/array/shared/unshift.rb46
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diff --git a/spec/ruby/core/array/shared/unshift.rb b/spec/ruby/core/array/shared/unshift.rb
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+describe :array_unshift, shared: true do
+ it "prepends object to the original array" do
+ a = [1, 2, 3]
+ a.send(@method, "a").should equal(a)
+ a.should == ['a', 1, 2, 3]
+ a.send(@method).should equal(a)
+ a.should == ['a', 1, 2, 3]
+ a.send(@method, 5, 4, 3)
+ a.should == [5, 4, 3, 'a', 1, 2, 3]
+
+ # shift all but one element
+ a = [1, 2]
+ a.shift
+ a.send(@method, 3, 4)
+ a.should == [3, 4, 2]
+
+ # now shift all elements
+ a.shift
+ a.shift
+ a.shift
+ a.send(@method, 3, 4)
+ a.should == [3, 4]
+ end
+
+ it "quietly ignores unshifting nothing" do
+ [].send(@method).should == []
+ end
+
+ it "properly handles recursive arrays" do
+ empty = ArraySpecs.empty_recursive_array
+ empty.send(@method, :new).should == [:new, empty]
+
+ array = ArraySpecs.recursive_array
+ array.send(@method, :new)
+ array[0..5].should == [:new, 1, 'two', 3.0, array, array]
+ end
+
+ it "raises a RuntimeError on a frozen array when the array is modified" do
+ lambda { ArraySpecs.frozen_array.send(@method, 1) }.should raise_error(RuntimeError)
+ end
+
+ # see [ruby-core:23666]
+ it "raises a RuntimeError on a frozen array when the array would not be modified" do
+ lambda { ArraySpecs.frozen_array.send(@method) }.should raise_error(RuntimeError)
+ end
+end