require 'spec_helper'

describe 'deep_merge' 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({ 'key' => 'value' }).and_raise_error(Puppet::ParseError, /wrong number of arguments/i) }
  it { is_expected.to run.with_params({}, '2').and_raise_error(Puppet::ParseError, /unexpected argument type String/) }
  it { is_expected.to run.with_params({}, 2).and_raise_error(Puppet::ParseError, /unexpected argument type Fixnum/) }
  it { is_expected.to run.with_params({}, '').and_return({}) }
  it { is_expected.to run.with_params({}, {}).and_return({}) }
  it { is_expected.to run.with_params({}, {}, {}).and_return({}) }
  it { is_expected.to run.with_params({}, {}, {}, {}).and_return({}) }
  it { is_expected.to run.with_params({'key' => 'value'}, '').and_return({'key' => 'value'}) }
  it { is_expected.to run.with_params({'key1' => 'value1'}, {'key2' => 'value2' }).and_return({'key1' => 'value1', 'key2' => 'value2'}) }

  describe 'when arguments have key collisions' do
    it 'should prefer values from the last hash' do
      is_expected.to run \
        .with_params(
          {'key1' => 'value1', 'key2' => 'value2' },
          {'key2' => 'replacement_value', 'key3' => 'value3'}) \
        .and_return(
          {'key1' => 'value1', 'key2' => 'replacement_value', 'key3' => 'value3'})
    end
    it { is_expected.to run \
      .with_params({'key1' => 'value1'}, {'key1' => 'value2'}, {'key1' => 'value3'}) \
      .and_return({'key1' => 'value3' })
    }
  end

  describe 'when arguments have subhashes' do
    it { is_expected.to run \
      .with_params({'key1' => 'value1'}, {'key2' => 'value2', 'key3' => {'subkey1' => 'value4'}}) \
      .and_return( {'key1' => 'value1', 'key2' => 'value2', 'key3' => {'subkey1' => 'value4'}})
    }
    it { is_expected.to run \
      .with_params({'key1' => {'subkey1' => 'value1'}}, {'key1' => {'subkey2' => 'value2'}}) \
      .and_return( {'key1' => {'subkey1' => 'value1', 'subkey2' => 'value2'}})
    }
    it { is_expected.to run \
      .with_params({'key1' => {'subkey1' => {'subsubkey1' => 'value1'}}}, {'key1' => {'subkey1' => {'subsubkey1' => 'value2'}}}) \
      .and_return( {'key1' => {'subkey1' => {'subsubkey1' => 'value2'}}})
    }
  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