diff options
Diffstat (limited to 'spec/ruby/core/enumerator/lazy/with_index_spec.rb')
-rw-r--r-- | spec/ruby/core/enumerator/lazy/with_index_spec.rb | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/lazy/with_index_spec.rb b/spec/ruby/core/enumerator/lazy/with_index_spec.rb new file mode 100644 index 0000000000..a6b5c38777 --- /dev/null +++ b/spec/ruby/core/enumerator/lazy/with_index_spec.rb @@ -0,0 +1,36 @@ +# -*- encoding: us-ascii -*- + +require_relative '../../../spec_helper' +require_relative 'fixtures/classes' + +describe "Enumerator::Lazy#with_index" do + it "enumerates with an index" do + (0..Float::INFINITY).lazy.with_index.map { |i, idx| [i, idx] }.first(3).should == [[0, 0], [1, 1], [2, 2]] + end + + it "enumerates with an index starting at a given offset" do + (0..Float::INFINITY).lazy.with_index(3).map { |i, idx| [i, idx] }.first(3).should == [[0, 3], [1, 4], [2, 5]] + end + + it "enumerates with an index starting at 0 when offset is nil" do + (0..Float::INFINITY).lazy.with_index(nil).map { |i, idx| [i, idx] }.first(3).should == [[0, 0], [1, 1], [2, 2]] + end + + it "raises TypeError when offset does not convert to Integer" do + -> { (0..Float::INFINITY).lazy.with_index(false).map { |i, idx| i }.first(3) }.should raise_error(TypeError) + end + + it "enumerates with a given block" do + result = [] + (0..Float::INFINITY).lazy.with_index { |i, idx| result << [i * 2, idx] }.first(3) + result.should == [[0,0],[2,1],[4,2]] + end + + it "resets after a new call to each" do + enum = (0..2).lazy.with_index.map { |i, idx| [i, idx] } + result = [] + enum.each { |i, idx| result << [i, idx] } + enum.each { |i, idx| result << [i, idx] } + result.should == [[0,0], [1,1], [2,2], [0,0], [1,1], [2,2]] + end +end |