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Diffstat (limited to 'spec/ruby/core/array/insert_spec.rb')
-rw-r--r-- | spec/ruby/core/array/insert_spec.rb | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/spec/ruby/core/array/insert_spec.rb b/spec/ruby/core/array/insert_spec.rb new file mode 100644 index 0000000000..cdf870df2a --- /dev/null +++ b/spec/ruby/core/array/insert_spec.rb @@ -0,0 +1,78 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Array#insert" do + it "returns self" do + ary = [] + ary.insert(0).should equal(ary) + ary.insert(0, :a).should equal(ary) + end + + it "inserts objects before the element at index for non-negative index" do + ary = [] + ary.insert(0, 3).should == [3] + ary.insert(0, 1, 2).should == [1, 2, 3] + ary.insert(0).should == [1, 2, 3] + + # Let's just assume insert() always modifies the array from now on. + ary.insert(1, 'a').should == [1, 'a', 2, 3] + ary.insert(0, 'b').should == ['b', 1, 'a', 2, 3] + ary.insert(5, 'c').should == ['b', 1, 'a', 2, 3, 'c'] + ary.insert(7, 'd').should == ['b', 1, 'a', 2, 3, 'c', nil, 'd'] + ary.insert(10, 5, 4).should == ['b', 1, 'a', 2, 3, 'c', nil, 'd', nil, nil, 5, 4] + end + + it "appends objects to the end of the array for index == -1" do + [1, 3, 3].insert(-1, 2, 'x', 0.5).should == [1, 3, 3, 2, 'x', 0.5] + end + + it "inserts objects after the element at index with negative index" do + ary = [] + ary.insert(-1, 3).should == [3] + ary.insert(-2, 2).should == [2, 3] + ary.insert(-3, 1).should == [1, 2, 3] + ary.insert(-2, -3).should == [1, 2, -3, 3] + ary.insert(-1, []).should == [1, 2, -3, 3, []] + ary.insert(-2, 'x', 'y').should == [1, 2, -3, 3, 'x', 'y', []] + ary = [1, 2, 3] + end + + it "pads with nils if the index to be inserted to is past the end" do + [].insert(5, 5).should == [nil, nil, nil, nil, nil, 5] + end + + it "can insert before the first element with a negative index" do + [1, 2, 3].insert(-4, -3).should == [-3, 1, 2, 3] + end + + it "raises an IndexError if the negative index is out of bounds" do + lambda { [].insert(-2, 1) }.should raise_error(IndexError) + lambda { [1].insert(-3, 2) }.should raise_error(IndexError) + end + + it "does nothing of no object is passed" do + [].insert(0).should == [] + [].insert(-1).should == [] + [].insert(10).should == [] + [].insert(-2).should == [] + end + + it "tries to convert the passed position argument to an Integer using #to_int" do + obj = mock('2') + obj.should_receive(:to_int).and_return(2) + [].insert(obj, 'x').should == [nil, nil, 'x'] + end + + it "raises an ArgumentError if no argument passed" do + lambda { [].insert() }.should raise_error(ArgumentError) + end + + it "raises a RuntimeError on frozen arrays when the array is modified" do + lambda { ArraySpecs.frozen_array.insert(0, 'x') }.should raise_error(RuntimeError) + end + + # see [ruby-core:23666] + it "raises a RuntimeError on frozen arrays when the array would not be modified" do + lambda { ArraySpecs.frozen_array.insert(0) }.should raise_error(RuntimeError) + end +end |