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Diffstat (limited to 'spec/ruby/core/enumerable/slice_when_spec.rb')
-rw-r--r-- | spec/ruby/core/enumerable/slice_when_spec.rb | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerable/slice_when_spec.rb b/spec/ruby/core/enumerable/slice_when_spec.rb new file mode 100644 index 0000000000..593e623b1b --- /dev/null +++ b/spec/ruby/core/enumerable/slice_when_spec.rb @@ -0,0 +1,54 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Enumerable#slice_when" do + before :each do + ary = [10, 9, 7, 6, 4, 3, 2, 1] + @enum = EnumerableSpecs::Numerous.new(*ary) + @result = @enum.slice_when { |i, j| i - 1 != j } + @enum_length = ary.length + end + + context "when given a block" do + it "returns an enumerator" do + @result.should be_an_instance_of(Enumerator) + end + + it "splits chunks between adjacent elements i and j where the block returns true" do + @result.to_a.should == [[10, 9], [7, 6], [4, 3, 2, 1]] + end + + it "calls the block for length of the receiver enumerable minus one times" do + times_called = 0 + @enum.slice_when do |i, j| + times_called += 1 + i - 1 != j + end.to_a + times_called.should == (@enum_length - 1) + end + + it "doesn't yield an empty array if the block matches the first or the last time" do + @enum.slice_when { true }.to_a.should == [[10], [9], [7], [6], [4], [3], [2], [1]] + end + + it "doesn't yield an empty array on a small enumerable" do + EnumerableSpecs::Empty.new.slice_when { raise }.to_a.should == [] + EnumerableSpecs::Numerous.new(42).slice_when { raise }.to_a.should == [[42]] + end + end + + context "when not given a block" do + it "raises an ArgumentError" do + lambda { @enum.slice_when }.should raise_error(ArgumentError) + end + end + + describe "when an iterator method yields more than one value" do + it "processes all yielded values" do + def foo + yield 1, 2 + end + to_enum(:foo).slice_when { true }.to_a.should == [[[1, 2]]] + end + end +end |