brew/Library/Homebrew/test/test_ENV.rb

require 'testing_env'

class EnvironmentTests < Test::Unit::TestCase
  def test_ENV_options
    ENV.gcc_4_0
    ENV.O3
    ENV.minimal_optimization
    ENV.no_optimization
    ENV.libxml2
    ENV.enable_warnings
    assert !ENV.cc.empty?
    assert !ENV.cxx.empty?
  end

  def test_switching_compilers
    ENV.llvm
    ENV.clang
    assert_nil ENV['LD']
    assert_equal ENV['OBJC'], ENV['CC']
  end

  def test_with_build_environment_restores_env
    before = ENV.to_hash
    ENV.with_build_environment do
      ENV['foo'] = 'bar'
    end
    assert_nil ENV['foo']
    assert_equal before, ENV.to_hash
  end

  def test_with_build_environment_ensures_env_restored
    ENV.expects(:replace).with(ENV.to_hash)
    begin
      ENV.with_build_environment { raise Exception }
    rescue Exception
    end
  end

  def test_with_build_environment_returns_block_value
    assert_equal 1, ENV.with_build_environment { 1 }
  end
end