test/ruby/test_symbol.rb


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require 'test/unit'

class TestSymbol < Test::Unit::TestCase
  # [ruby-core:3573]

  def assert_eval_inspected(sym)
    n = sym.inspect
    assert_nothing_raised(SyntaxError) {assert_equal(sym, eval(n))}
  end

  def test_inspect_invalid
    # 2) Symbol#inspect sometimes returns invalid symbol representations:
    assert_eval_inspected(:"!")
    assert_eval_inspected(:"=")
    assert_eval_inspected(:"0")
    assert_eval_inspected(:"$1")
    assert_eval_inspected(:"@1")
    assert_eval_inspected(:"@@1")
    assert_eval_inspected(:"@")
    assert_eval_inspected(:"@@")
  end

  def assert_inspect_evaled(n)
    assert_nothing_raised(SyntaxError) {assert_equal(n, eval(n).inspect)}
  end

  def test_inspect_suboptimal
    # 3) Symbol#inspect sometimes returns suboptimal symbol representations:
    assert_inspect_evaled(':foo')
    assert_inspect_evaled(':foo!')
    assert_inspect_evaled(':bar?')
  end

  def test_inspect_dollar
    # 4) :$- always treats next character literally:
    sym = "$-".intern
    assert_nothing_raised(SyntaxError) {assert_equal(sym, eval(':$-'))}
    assert_nothing_raised(SyntaxError) {assert_equal(sym, eval(":$-\n"))}
    assert_nothing_raised(SyntaxError) {assert_equal(sym, eval(":$- "))}
    assert_nothing_raised(SyntaxError) {assert_equal(sym, eval(":$-#"))}
    assert_raise(SyntaxError) {eval ':$-('}
  end

  def test_inspect_number
    # 5) Inconsistency between :$0 and :$1? The first one is valid, but the 
    # latter isn't.
    assert_inspect_evaled(':$0')
    assert_inspect_evaled(':$1')
  end
end