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# Author:: Daniel DeLeo (<dan@kallistec.com>)
# Copyright:: Copyright (c) 2009 Daniel DeLeo
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'spec_helper'
describe Chef::ResourceCollection::StepableIterator do
CRSI = Chef::ResourceCollection::StepableIterator
it "has an empty array for its collection by default" do
CRSI.new.collection.should == []
end
describe "doing basic iteration" do
before do
@simple_collection = [1,2,3,4]
@iterator = CRSI.for_collection(@simple_collection)
end
it "re-initializes the instance with a collection" do
@iterator.collection.should equal(@simple_collection)
@iterator.size.should == 4
end
it "iterates over the collection" do
sum = 0
@iterator.each do |int|
sum += int
end
sum.should == 10
end
it "iterates over the collection with each_index" do
collected_by_index = []
@iterator.each_index do |idx|
collected_by_index << @simple_collection[idx]
end
collected_by_index.should == @simple_collection
collected_by_index.should_not equal(@simple_collection)
end
it "iterates over the collection with index and element" do
collected = {}
@iterator.each_with_index do |element, index|
collected[index] = element
end
collected.should == {0=>1, 1=>2, 2=>3, 3=>4}
end
end
describe "pausing and resuming iteration" do
before do
@collection = []
@snitch_var = nil
@collection << lambda { @snitch_var = 23 }
@collection << lambda { @iterator.pause }
@collection << lambda { @snitch_var = 42 }
@iterator = CRSI.for_collection(@collection)
@iterator.each { |proc| proc.call }
end
it "allows the iteration to be paused" do
@snitch_var.should == 23
end
it "allows the iteration to be resumed" do
@snitch_var.should == 23
@iterator.resume
@snitch_var.should == 42
end
it "allows iteration to be rewound" do
@iterator.skip_back(2)
@iterator.resume
@snitch_var.should == 23
@iterator.resume
@snitch_var.should == 42
end
it "allows iteration to be fast forwarded" do
@iterator.skip_forward
@iterator.resume
@snitch_var.should == 23
end
it "allows iteration to be rewound" do
@snitch_var = nil
@iterator.rewind
@iterator.position.should == 0
@iterator.resume
@snitch_var.should == 23
end
it "allows iteration to be stepped" do
@snitch_var = nil
@iterator.rewind
@iterator.step
@iterator.position.should == 1
@snitch_var.should == 23
end
it "doesn't step if there are no more steps" do
@iterator.step.should == 3
lambda {@iterator.step}.should_not raise_error
@iterator.step.should be_nil
end
it "allows the iteration to start by being stepped" do
@snitch_var = nil
@iterator = CRSI.for_collection(@collection)
@iterator.iterate_on(:element) { |proc| proc.call }
@iterator.step
@iterator.position.should == 1
@snitch_var.should == 23
end
it "should work correctly when elements are added to the collection during iteration" do
@collection.insert(2, lambda { @snitch_var = 815})
@collection.insert(3, lambda { @iterator.pause })
@iterator.resume
@snitch_var.should == 815
@iterator.resume
@snitch_var.should == 42
end
end
end
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