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# Author:: Daniel DeLeo (<dan@kallistec.com>)
# Copyright:: Copyright 2009-2016, 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
expect(CRSI.new.collection).to eq([])
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
expect(@iterator.collection).to equal(@simple_collection)
expect(@iterator.size).to eq(4)
end
it "iterates over the collection" do
sum = 0
@iterator.each do |int|
sum += int
end
expect(sum).to eq(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
expect(collected_by_index).to eq(@simple_collection)
expect(collected_by_index).not_to 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
expect(collected).to eq({ 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
expect(@snitch_var).to eq(23)
end
it "allows the iteration to be resumed" do
expect(@snitch_var).to eq(23)
@iterator.resume
expect(@snitch_var).to eq(42)
end
it "allows iteration to be rewound" do
@iterator.skip_back(2)
@iterator.resume
expect(@snitch_var).to eq(23)
@iterator.resume
expect(@snitch_var).to eq(42)
end
it "allows iteration to be fast forwarded" do
@iterator.skip_forward
@iterator.resume
expect(@snitch_var).to eq(23)
end
it "allows iteration to be rewound" do
@snitch_var = nil
@iterator.rewind
expect(@iterator.position).to eq(0)
@iterator.resume
expect(@snitch_var).to eq(23)
end
it "allows iteration to be stepped" do
@snitch_var = nil
@iterator.rewind
@iterator.step
expect(@iterator.position).to eq(1)
expect(@snitch_var).to eq(23)
end
it "doesn't step if there are no more steps" do
expect(@iterator.step).to eq(3)
expect { @iterator.step }.not_to raise_error
expect(@iterator.step).to 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
expect(@iterator.position).to eq(1)
expect(@snitch_var).to eq(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
expect(@snitch_var).to eq(815)
@iterator.resume
expect(@snitch_var).to eq(42)
end
end
end
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