concat_merge_spec.rb
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	require 'spec_helper'

	describe 'concat_merge' do

	describe 'exception handling' do
	it { is_expected.to run.with_params().and_raise_error(
	Puppet::ParseError, /wrong number of arguments/i
	) }

	it { is_expected.to run.with_params({}).and_raise_error(
	Puppet::ParseError, /wrong number of arguments/i
	) }

	it { is_expected.to run.with_params('2', 2).and_raise_error(
	Puppet::ParseError, /unexpected argument type/
	) }

	it { is_expected.to run.with_params(2, '2').and_raise_error(
	Puppet::ParseError, /unexpected argument type/
	) }
	end

	describe 'collisions' do
	context 'single keys' do
	it { is_expected.to run.with_params({
	'key1' => 'value1'
	},{
	'key1' => 'value2'
	}).and_return({
	'key1' => 'value2'
	}) }

	it { is_expected.to run.with_params({
	'key1' => 'value1'
	},{
	'key1' => 'value2'
	},{
	'key1' => 'value3'
	}).and_return({
	'key1' => 'value3'
	}) }
	end

	context 'multiple keys' do
	it { is_expected.to run.with_params({
	'key1' => 'value1',
	'key2' => 'value2'
	},{
	'key1' => 'value2'
	}).and_return({
	'key1' => 'value2',
	'key2' => 'value2'
	}) }

	it { is_expected.to run.with_params({
	'key1' => 'value1',
	'key2' => 'value1'
	},{
	'key1' => 'value2'
	},{
	'key1' => 'value3',
	'key2' => 'value2'
	}).and_return({
	'key1' => 'value3',
	'key2' => 'value2'
	}) }
	end
	end

	describe 'concat merging' do
	context 'single keys' do
	it { is_expected.to run.with_params({
	'key1' => ['value1']
	},{
	'key1' => ['value2']
	}).and_return({
	'key1' => ['value1', 'value2']
	}) }

	it { is_expected.to run.with_params({
	'key1' => ['value1']
	},{
	'key1' => ['value2']
	},{
	'key1' => ['value3']
	}).and_return({
	'key1' => ['value1', 'value2', 'value3']
	}) }

	it { is_expected.to run.with_params({
	'key1' => ['value1']
	},{
	'key1' => 'value2'
	}).and_return({
	'key1' => 'value2'
	}) }

	it { is_expected.to run.with_params({
	'key1' => 'value1'
	},{
	'key1' => ['value2']
	}).and_return({
	'key1' => ['value2']
	}) }
	end

	context 'multiple keys' do
	it { is_expected.to run.with_params({
	'key1' => ['value1'],
	'key2' => ['value3']
	},{
	'key1' => ['value2'],
	'key2' => ['value4']
	}).and_return({
	'key1' => ['value1', 'value2'],
	'key2' => ['value3', 'value4']
	}) }

	it { is_expected.to run.with_params({
	'key1' => ['value1'],
	'key2' => ['value1.1']
	},{
	'key1' => ['value2'],
	'key2' => ['value2.1']
	},{
	'key1' => ['value3'],
	'key2' => ['value3.1']
	}).and_return({
	'key1' => ['value1', 'value2', 'value3'],
	'key2' => ['value1.1', 'value2.1', 'value3.1']
	}) }

	it { is_expected.to run.with_params({
	'key1' => ['value1'],
	'key2' => 'value1'
	},{
	'key1' => 'value2',
	'key2' => ['value2']
	}).and_return({
	'key1' => 'value2',
	'key2' => ['value2']
	}) }

	it { is_expected.to run.with_params({
	'key1' => 'value1',
	'key2' => ['value1']
	},{
	'key1' => ['value2'],
	'key2' => 'value2'
	}).and_return({
	'key1' => ['value2'],
	'key2' => 'value2'
	}) }
	end
	end

	it 'should not change the original hashes' do
	argument1 = { 'key1' => 'value1' }
	original1 = argument1.dup
	argument2 = { 'key2' => 'value2' }
	original2 = argument2.dup

	subject.call([argument1, argument2])
	expect(argument1).to eq(original1)
	expect(argument2).to eq(original2)
	end

	end

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