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Diffstat (limited to 'spec/ruby/core/enumerable/drop_spec.rb')
-rw-r--r-- | spec/ruby/core/enumerable/drop_spec.rb | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerable/drop_spec.rb b/spec/ruby/core/enumerable/drop_spec.rb new file mode 100644 index 0000000000..1bcdc0ee9a --- /dev/null +++ b/spec/ruby/core/enumerable/drop_spec.rb @@ -0,0 +1,43 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Enumerable#drop" do + before :each do + @enum = EnumerableSpecs::Numerous.new(3, 2, 1, :go) + end + + it "requires exactly one argument" do + lambda{ @enum.drop{} }.should raise_error(ArgumentError) + lambda{ @enum.drop(1, 2){} }.should raise_error(ArgumentError) + end + + describe "passed a number n as an argument" do + it "raises ArgumentError if n < 0" do + lambda{ @enum.drop(-1) }.should raise_error(ArgumentError) + end + + it "tries to convert n to an Integer using #to_int" do + @enum.drop(2.3).should == [1, :go] + + obj = mock('to_int') + obj.should_receive(:to_int).and_return(2) + @enum.drop(obj).should == [1, :go] + end + + it "returns [] for empty enumerables" do + EnumerableSpecs::Empty.new.drop(0).should == [] + EnumerableSpecs::Empty.new.drop(2).should == [] + end + + it "returns [] if dropping all" do + @enum.drop(5).should == [] + EnumerableSpecs::Numerous.new(3, 2, 1, :go).drop(4).should == [] + end + + it "raises a TypeError when the passed n can be coerced to Integer" do + lambda{ @enum.drop("hat") }.should raise_error(TypeError) + lambda{ @enum.drop(nil) }.should raise_error(TypeError) + end + + end +end |