spec/ruby/core/hash/deconstruct_keys_spec.rb


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require_relative '../../spec_helper'

describe "Hash#deconstruct_keys" do
  it "returns self" do
    hash = {a: 1, b: 2}

    hash.deconstruct_keys([:a, :b]).should equal hash
  end

  it "requires one argument" do
    -> {
      {a: 1}.deconstruct_keys
    }.should raise_error(ArgumentError, /wrong number of arguments \(given 0, expected 1\)/)
  end

  it "ignores argument" do
    hash = {a: 1, b: 2}

    hash.deconstruct_keys([:a]).should == {a: 1, b: 2}
    hash.deconstruct_keys(0   ).should == {a: 1, b: 2}
    hash.deconstruct_keys(''  ).should == {a: 1, b: 2}
  end
end