vendor/bundle/ruby/2.4.0/gems/ffi-1.9.18/spec/ffi/struct_packed_spec.rb

#
# This file is part of ruby-ffi.
# For licensing, see LICENSE.SPECS
#

require File.expand_path(File.join(File.dirname(__FILE__), "spec_helper"))

describe FFI::Struct do
  it "packed :char followed by :int should have size of 5" do
    expect(Class.new(FFI::Struct) do
      packed
      layout :c, :char, :i, :int
    end.size).to eq(5)
  end

  it "packed :char followed by :int should have alignment of 1" do
    expect(Class.new(FFI::Struct) do
      packed
      layout :c, :char, :i, :int
    end.alignment).to eq(1)
  end

  it "packed(2) :char followed by :int should have size of 6" do
    expect(Class.new(FFI::Struct) do
      packed 2
      layout :c, :char, :i, :int
    end.size).to eq(6)
  end

  it "packed(2)  :char followed by :int should have alignment of 2" do
    expect(Class.new(FFI::Struct) do
      packed 2
      layout :c, :char, :i, :int
    end.alignment).to eq(2)
  end

  it "packed :short followed by int should have size of 6" do
    expect(Class.new(FFI::Struct) do
      packed
      layout :s, :short, :i, :int
    end.size).to eq(6)
  end

  it "packed :short followed by int should have alignment of 1" do
    expect(Class.new(FFI::Struct) do
      packed
      layout :s, :short, :i, :int
    end.alignment).to eq(1)
  end
end