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Diffstat (limited to 'spec/ruby/core/array/last_spec.rb')
-rw-r--r-- | spec/ruby/core/array/last_spec.rb | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/spec/ruby/core/array/last_spec.rb b/spec/ruby/core/array/last_spec.rb new file mode 100644 index 0000000000..c707e3ff7e --- /dev/null +++ b/spec/ruby/core/array/last_spec.rb @@ -0,0 +1,87 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Array#last" do + it "returns the last element" do + [1, 1, 1, 1, 2].last.should == 2 + end + + it "returns nil if self is empty" do + [].last.should == nil + end + + it "returns the last count elements if given a count" do + [1, 2, 3, 4, 5, 9].last(3).should == [4, 5, 9] + end + + it "returns an empty array when passed a count on an empty array" do + [].last(0).should == [] + [].last(1).should == [] + end + + it "returns an empty array when count == 0" do + [1, 2, 3, 4, 5].last(0).should == [] + end + + it "returns an array containing the last element when passed count == 1" do + [1, 2, 3, 4, 5].last(1).should == [5] + end + + it "raises an ArgumentError when count is negative" do + lambda { [1, 2].last(-1) }.should raise_error(ArgumentError) + end + + it "returns the entire array when count > length" do + [1, 2, 3, 4, 5, 9].last(10).should == [1, 2, 3, 4, 5, 9] + end + + it "returns an array which is independent to the original when passed count" do + ary = [1, 2, 3, 4, 5] + ary.last(0).replace([1,2]) + ary.should == [1, 2, 3, 4, 5] + ary.last(1).replace([1,2]) + ary.should == [1, 2, 3, 4, 5] + ary.last(6).replace([1,2]) + ary.should == [1, 2, 3, 4, 5] + end + + it "properly handles recursive arrays" do + empty = ArraySpecs.empty_recursive_array + empty.last.should equal(empty) + + array = ArraySpecs.recursive_array + array.last.should equal(array) + end + + it "tries to convert the passed argument to an Integer usinig #to_int" do + obj = mock('to_int') + obj.should_receive(:to_int).and_return(2) + [1, 2, 3, 4, 5].last(obj).should == [4, 5] + end + + it "raises a TypeError if the passed argument is not numeric" do + lambda { [1,2].last(nil) }.should raise_error(TypeError) + lambda { [1,2].last("a") }.should raise_error(TypeError) + + obj = mock("nonnumeric") + lambda { [1,2].last(obj) }.should raise_error(TypeError) + end + + it "does not return subclass instance on Array subclasses" do + ArraySpecs::MyArray[].last(0).should be_an_instance_of(Array) + ArraySpecs::MyArray[].last(2).should be_an_instance_of(Array) + ArraySpecs::MyArray[1, 2, 3].last(0).should be_an_instance_of(Array) + ArraySpecs::MyArray[1, 2, 3].last(1).should be_an_instance_of(Array) + ArraySpecs::MyArray[1, 2, 3].last(2).should be_an_instance_of(Array) + end + + it "is not destructive" do + a = [1, 2, 3] + a.last + a.should == [1, 2, 3] + a.last(2) + a.should == [1, 2, 3] + a.last(3) + a.should == [1, 2, 3] + end +end |