string_ext_test.rb

# encoding: utf-8
require 'date'
require 'abstract_unit'
require 'inflector_test_cases'
require 'constantize_test_cases'

require 'active_support/inflector'
require 'active_support/core_ext/string'
require 'active_support/time'
require 'active_support/core_ext/string/strip'
require 'active_support/core_ext/string/output_safety'
require 'active_support/core_ext/string/indent'

class StringInflectionsTest < ActiveSupport::TestCase
  include InflectorTestCases
  include ConstantizeTestCases

  def test_strip_heredoc_on_an_empty_string
    assert_equal '', ''.strip_heredoc
  end

  def test_strip_heredoc_on_a_string_with_no_lines
    assert_equal 'x', 'x'.strip_heredoc
    assert_equal 'x', '    x'.strip_heredoc
  end

  def test_strip_heredoc_on_a_heredoc_with_no_margin
    assert_equal "foo\nbar", "foo\nbar".strip_heredoc
    assert_equal "foo\n  bar", "foo\n  bar".strip_heredoc
  end

  def test_strip_heredoc_on_a_regular_indented_heredoc
    assert_equal "foo\n  bar\nbaz\n", <<-EOS.strip_heredoc
      foo
        bar
      baz
    EOS
  end

  def test_strip_heredoc_on_a_regular_indented_heredoc_with_blank_lines
    assert_equal "foo\n  bar\n\nbaz\n", <<-EOS.strip_heredoc
      foo
        bar

      baz
    EOS
  end

  def test_pluralize
    SingularToPlural.each do |singular, plural|
      assert_equal(plural, singular.pluralize)
    end

    assert_equal("plurals", "plurals".pluralize)

    assert_equal("blargles", "blargle".pluralize(0))
    assert_equal("blargle", "blargle".pluralize(1))
    assert_equal("blargles", "blargle".pluralize(2))
  end

  def test_singularize
    SingularToPlural.each do |singular, plural|
      assert_equal(singular, plural.singularize)
    end
  end

  def test_titleize
    MixtureToTitleCase.each do |before, titleized|
      assert_equal(titleized, before.titleize)
    end
  end

  def test_camelize
    CamelToUnderscore.each do |camel, underscore|
      assert_equal(camel, underscore.camelize)
    end
  end

  def test_camelize_lower
    assert_equal('capital', 'Capital'.camelize(:lower))
  end

  def test_dasherize
    UnderscoresToDashes.each do |underscored, dasherized|
      assert_equal(dasherized, underscored.dasherize)
    end
  end

  def test_underscore
    CamelToUnderscore.each do |camel, underscore|
      assert_equal(underscore, camel.underscore)
    end

    assert_equal "html_tidy", "HTMLTidy".underscore
    assert_equal "html_tidy_generator", "HTMLTidyGenerator".underscore
  end

  def test_underscore_to_lower_camel
    UnderscoreToLowerCamel.each do |underscored, lower_camel|
      assert_equal(lower_camel, underscored.camelize(:lower))
    end
  end

  def test_demodulize
    assert_equal "Account", "MyApplication::Billing::Account".demodulize
  end

  def test_deconstantize
    assert_equal "MyApplication::Billing", "MyApplication::Billing::Account".deconstantize
  end

  def test_foreign_key
    ClassNameToForeignKeyWithUnderscore.each do |klass, foreign_key|
      assert_equal(foreign_key, klass.foreign_key)
    end

    ClassNameToForeignKeyWithoutUnderscore.each do |klass, foreign_key|
      assert_equal(foreign_key, klass.foreign_key(false))
    end
  end

  def test_tableize
    ClassNameToTableName.each do |class_name, table_name|
      assert_equal(table_name, class_name.tableize)
    end
  end

  def test_classify
    ClassNameToTableName.each do |class_name, table_name|
      assert_equal(class_name, table_name.classify)
    end
  end

  def test_string_parameterized_normal
    StringToParameterized.each do |normal, slugged|
      assert_equal(normal.parameterize, slugged)
    end
  end

  def test_string_parameterized_no_separator
    StringToParameterizeWithNoSeparator.each do |normal, slugged|
      assert_equal(normal.parameterize(''), slugged)
    end
  end

  def test_string_parameterized_underscore
    StringToParameterizeWithUnderscore.each do |normal, slugged|
      assert_equal(normal.parameterize('_'), slugged)
    end
  end

  def test_humanize
    UnderscoreToHuman.each do |underscore, human|
      assert_equal(human, underscore.humanize)
    end
  end

  def test_humanize_without_capitalize
    UnderscoreToHumanWithoutCapitalize.each do |underscore, human|
      assert_equal(human, underscore.humanize(capitalize: false))
    end
  end

  def test_ord
    assert_equal 97, 'a'.ord
    assert_equal 97, 'abc'.ord
  end

  def test_access
    s = "hello"
    assert_equal "h", s.at(0)

    assert_equal "llo", s.from(2)
    assert_equal "hel", s.to(2)

    assert_equal "h", s.first
    assert_equal "he", s.first(2)
    assert_equal "", s.first(0)

    assert_equal "o", s.last
    assert_equal "llo", s.last(3)
    assert_equal "hello", s.last(10)
    assert_equal "", s.last(0)

    assert_equal 'x', 'x'.first
    assert_equal 'x', 'x'.first(4)

    assert_equal 'x', 'x'.last
    assert_equal 'x', 'x'.last(4)
  end

  def test_access_returns_a_real_string
    hash = {}
    hash["h"] = true
    hash["hello123".at(0)] = true
    assert_equal %w(h), hash.keys

    hash = {}
    hash["llo"] = true
    hash["hello".from(2)] = true
    assert_equal %w(llo), hash.keys

    hash = {}
    hash["hel"] = true
    hash["hello".to(2)] = true
    assert_equal %w(hel), hash.keys

    hash = {}
    hash["hello"] = true
    hash["123hello".last(5)] = true
    assert_equal %w(hello), hash.keys

    hash = {}
    hash["hello"] = true
    hash["hello123".first(5)] = true
    assert_equal %w(hello), hash.keys
  end

  def test_starts_ends_with_alias
    s = "hello"
    assert s.starts_with?('h')
    assert s.starts_with?('hel')
    assert !s.starts_with?('el')

    assert s.ends_with?('o')
    assert s.ends_with?('lo')
    assert !s.ends_with?('el')
  end

  def test_string_squish
    original = %{\u180E\u180E A string surrounded by unicode mongolian vowel separators,
      with tabs(\t\t), newlines(\n\n), unicode nextlines(\u0085\u0085) and many spaces(  ). \u180E\u180E}

    expected = "A string surrounded by unicode mongolian vowel separators, " +
      "with tabs( ), newlines( ), unicode nextlines( ) and many spaces( )."

    # Make sure squish returns what we expect:
    assert_equal original.squish,  expected
    # But doesn't modify the original string:
    assert_not_equal original, expected

    # Make sure squish! returns what we expect:
    assert_equal original.squish!, expected
    # And changes the original string:
    assert_equal original, expected
  end

  def test_string_inquiry
    assert "production".inquiry.production?
    assert !"production".inquiry.development?
  end

  def test_truncate
    assert_equal "Hello World!", "Hello World!".truncate(12)
    assert_equal "Hello Wor...", "Hello World!!".truncate(12)
  end

  def test_truncate_with_omission_and_seperator
    assert_equal "Hello[...]", "Hello World!".truncate(10, :omission => "[...]")
    assert_equal "Hello[...]", "Hello Big World!".truncate(13, :omission => "[...]", :separator => ' ')
    assert_equal "Hello Big[...]", "Hello Big World!".truncate(14, :omission => "[...]", :separator => ' ')
    assert_equal "Hello Big[...]", "Hello Big World!".truncate(15, :omission => "[...]", :separator => ' ')
  end

  def test_truncate_with_omission_and_regexp_seperator
    assert_equal "Hello[...]", "Hello Big World!".truncate(13, :omission => "[...]", :separator => /\s/)
    assert_equal "Hello Big[...]", "Hello Big World!".truncate(14, :omission => "[...]", :separator => /\s/)
    assert_equal "Hello Big[...]", "Hello Big World!".truncate(15, :omission => "[...]", :separator => /\s/)
  end

  def test_truncate_multibyte
    assert_equal "\354\225\204\353\246\254\353\236\221 \354\225\204\353\246\254 ...".force_encoding(Encoding::UTF_8),
      "\354\225\204\353\246\254\353\236\221 \354\225\204\353\246\254 \354\225\204\353\235\274\353\246\254\354\230\244".force_encoding(Encoding::UTF_8).truncate(10)
  end

  def test_truncate_should_not_be_html_safe
    assert !"Hello World!".truncate(12).html_safe?
  end

  def test_remove
    assert_equal "Summer", "Fast Summer".remove(/Fast /)
    assert_equal "Summer", "Fast Summer".remove!(/Fast /)
  end

  def test_constantize
    run_constantize_tests_on do |string|
      string.constantize
    end
  end

  def test_safe_constantize
    run_safe_constantize_tests_on do |string|
      string.safe_constantize
    end
  end
end

class StringConversionsTest < ActiveSupport::TestCase
  def test_string_to_time
    with_env_tz "Europe/Moscow" do
      assert_equal Time.utc(2005, 2, 27, 23, 50), "2005-02-27 23:50".to_time(:utc)
      assert_equal Time.local(2005, 2, 27, 23, 50), "2005-02-27 23:50".to_time
      assert_equal Time.utc(2005, 2, 27, 23, 50, 19, 275038), "2005-02-27T23:50:19.275038".to_time(:utc)
      assert_equal Time.local(2005, 2, 27, 23, 50, 19, 275038), "2005-02-27T23:50:19.275038".to_time
      assert_equal Time.utc(2039, 2, 27, 23, 50), "2039-02-27 23:50".to_time(:utc)
      assert_equal Time.local(2039, 2, 27, 23, 50), "2039-02-27 23:50".to_time
      assert_equal Time.local(2011, 2, 27, 17, 50), "2011-02-27 13:50 -0100".to_time
      assert_equal Time.utc(2011, 2, 27, 23, 50), "2011-02-27 22:50 -0100".to_time(:utc)
      assert_equal Time.local(2005, 2, 27, 22, 50), "2005-02-27 14:50 -0500".to_time
      assert_nil "".to_time
    end
  end

  def test_string_to_time_utc_offset
    with_env_tz "US/Eastern" do
      assert_equal 0, "2005-02-27 23:50".to_time(:utc).utc_offset
      assert_equal(-18000, "2005-02-27 23:50".to_time.utc_offset)
      assert_equal 0, "2005-02-27 22:50 -0100".to_time(:utc).utc_offset
      assert_equal(-18000, "2005-02-27 22:50 -0100".to_time.utc_offset)
    end
  end

  def test_partial_string_to_time
    with_env_tz "Europe/Moscow" do
      now = Time.now
      assert_equal Time.local(now.year, now.month, now.day, 23, 50), "23:50".to_time
      assert_equal Time.utc(now.year, now.month, now.day, 23, 50), "23:50".to_time(:utc)
      assert_equal Time.local(now.year, now.month, now.day, 18, 50), "13:50 -0100".to_time
      assert_equal Time.utc(now.year, now.month, now.day, 23, 50), "22:50 -0100".to_time(:utc)
    end
  end

  def test_standard_time_string_to_time_when_current_time_is_standard_time
    with_env_tz "US/Eastern" do
      Time.stubs(:now).returns(Time.local(2012, 1, 1))
      assert_equal Time.local(2012, 1, 1, 10, 0), "2012-01-01 10:00".to_time
      assert_equal Time.utc(2012, 1, 1, 10, 0), "2012-01-01 10:00".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 13, 0), "2012-01-01 10:00 -0800".to_time
      assert_equal Time.utc(2012, 1, 1, 18, 0), "2012-01-01 10:00 -0800".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 10, 0), "2012-01-01 10:00 -0500".to_time
      assert_equal Time.utc(2012, 1, 1, 15, 0), "2012-01-01 10:00 -0500".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 5, 0), "2012-01-01 10:00 UTC".to_time
      assert_equal Time.utc(2012, 1, 1, 10, 0), "2012-01-01 10:00 UTC".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 13, 0), "2012-01-01 10:00 PST".to_time
      assert_equal Time.utc(2012, 1, 1, 18, 0), "2012-01-01 10:00 PST".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 10, 0), "2012-01-01 10:00 EST".to_time
      assert_equal Time.utc(2012, 1, 1, 15, 0), "2012-01-01 10:00 EST".to_time(:utc)
    end
  end

  def test_standard_time_string_to_time_when_current_time_is_daylight_savings
    with_env_tz "US/Eastern" do
      Time.stubs(:now).returns(Time.local(2012, 7, 1))
      assert_equal Time.local(2012, 1, 1, 10, 0), "2012-01-01 10:00".to_time
      assert_equal Time.utc(2012, 1, 1, 10, 0), "2012-01-01 10:00".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 13, 0), "2012-01-01 10:00 -0800".to_time
      assert_equal Time.utc(2012, 1, 1, 18, 0), "2012-01-01 10:00 -0800".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 10, 0), "2012-01-01 10:00 -0500".to_time
      assert_equal Time.utc(2012, 1, 1, 15, 0), "2012-01-01 10:00 -0500".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 5, 0), "2012-01-01 10:00 UTC".to_time
      assert_equal Time.utc(2012, 1, 1, 10, 0), "2012-01-01 10:00 UTC".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 13, 0), "2012-01-01 10:00 PST".to_time
      assert_equal Time.utc(2012, 1, 1, 18, 0), "2012-01-01 10:00 PST".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 10, 0), "2012-01-01 10:00 EST".to_time
      assert_equal Time.utc(2012, 1, 1, 15, 0), "2012-01-01 10:00 EST".to_time(:utc)
    end
  end

  def test_daylight_savings_string_to_time_when_current_time_is_standard_time
    with_env_tz "US/Eastern" do
      Time.stubs(:now).returns(Time.local(2012, 1, 1))
      assert_equal Time.local(2012, 7, 1, 10, 0), "2012-07-01 10:00".to_time
      assert_equal Time.utc(2012, 7, 1, 10, 0), "2012-07-01 10:00".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 13, 0), "2012-07-01 10:00 -0700".to_time
      assert_equal Time.utc(2012, 7, 1, 17, 0), "2012-07-01 10:00 -0700".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 10, 0), "2012-07-01 10:00 -0400".to_time
      assert_equal Time.utc(2012, 7, 1, 14, 0), "2012-07-01 10:00 -0400".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 6, 0), "2012-07-01 10:00 UTC".to_time
      assert_equal Time.utc(2012, 7, 1, 10, 0), "2012-07-01 10:00 UTC".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 13, 0), "2012-07-01 10:00 PDT".to_time
      assert_equal Time.utc(2012, 7, 1, 17, 0), "2012-07-01 10:00 PDT".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 10, 0), "2012-07-01 10:00 EDT".to_time
      assert_equal Time.utc(2012, 7, 1, 14, 0), "2012-07-01 10:00 EDT".to_time(:utc)
    end
  end

  def test_daylight_savings_string_to_time_when_current_time_is_daylight_savings
    with_env_tz "US/Eastern" do
      Time.stubs(:now).returns(Time.local(2012, 7, 1))
      assert_equal Time.local(2012, 7, 1, 10, 0), "2012-07-01 10:00".to_time
      assert_equal Time.utc(2012, 7, 1, 10, 0), "2012-07-01 10:00".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 13, 0), "2012-07-01 10:00 -0700".to_time
      assert_equal Time.utc(2012, 7, 1, 17, 0), "2012-07-01 10:00 -0700".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 10, 0), "2012-07-01 10:00 -0400".to_time
      assert_equal Time.utc(2012, 7, 1, 14, 0), "2012-07-01 10:00 -0400".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 6, 0), "2012-07-01 10:00 UTC".to_time
      assert_equal Time.utc(2012, 7, 1, 10, 0), "2012-07-01 10:00 UTC".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 13, 0), "2012-07-01 10:00 PDT".to_time
      assert_equal Time.utc(2012, 7, 1, 17, 0), "2012-07-01 10:00 PDT".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 10, 0), "2012-07-01 10:00 EDT".to_time
      assert_equal Time.utc(2012, 7, 1, 14, 0), "2012-07-01 10:00 EDT".to_time(:utc)
    end
  end

  def test_partial_string_to_time_when_current_time_is_standard_time
    with_env_tz "US/Eastern" do
      Time.stubs(:now).returns(Time.local(2012, 1, 1))
      assert_equal Time.local(2012, 1, 1, 10, 0), "10:00".to_time
      assert_equal Time.utc(2012, 1, 1, 10, 0),  "10:00".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 6, 0), "10:00 -0100".to_time
      assert_equal Time.utc(2012, 1, 1, 11, 0), "10:00 -0100".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 10, 0), "10:00 -0500".to_time
      assert_equal Time.utc(2012, 1, 1, 15, 0), "10:00 -0500".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 5, 0), "10:00 UTC".to_time
      assert_equal Time.utc(2012, 1, 1, 10, 0), "10:00 UTC".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 13, 0), "10:00 PST".to_time
      assert_equal Time.utc(2012, 1, 1, 18, 0), "10:00 PST".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 12, 0), "10:00 PDT".to_time
      assert_equal Time.utc(2012, 1, 1, 17, 0), "10:00 PDT".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 10, 0), "10:00 EST".to_time
      assert_equal Time.utc(2012, 1, 1, 15, 0), "10:00 EST".to_time(:utc)
      assert_equal Time.local(2012, 1, 1, 9, 0), "10:00 EDT".to_time
      assert_equal Time.utc(2012, 1, 1, 14, 0), "10:00 EDT".to_time(:utc)
    end
  end

  def test_partial_string_to_time_when_current_time_is_daylight_savings
    with_env_tz "US/Eastern" do
      Time.stubs(:now).returns(Time.local(2012, 7, 1))
      assert_equal Time.local(2012, 7, 1, 10, 0), "10:00".to_time
      assert_equal Time.utc(2012, 7, 1, 10, 0), "10:00".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 7, 0), "10:00 -0100".to_time
      assert_equal Time.utc(2012, 7, 1, 11, 0), "10:00 -0100".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 11, 0), "10:00 -0500".to_time
      assert_equal Time.utc(2012, 7, 1, 15, 0), "10:00 -0500".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 6, 0), "10:00 UTC".to_time
      assert_equal Time.utc(2012, 7, 1, 10, 0), "10:00 UTC".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 14, 0), "10:00 PST".to_time
      assert_equal Time.utc(2012, 7, 1, 18, 0), "10:00 PST".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 13, 0), "10:00 PDT".to_time
      assert_equal Time.utc(2012, 7, 1, 17, 0), "10:00 PDT".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 11, 0), "10:00 EST".to_time
      assert_equal Time.utc(2012, 7, 1, 15, 0), "10:00 EST".to_time(:utc)
      assert_equal Time.local(2012, 7, 1, 10, 0), "10:00 EDT".to_time
      assert_equal Time.utc(2012, 7, 1, 14, 0), "10:00 EDT".to_time(:utc)
    end
  end

  def test_string_to_datetime
    assert_equal DateTime.civil(2039, 2, 27, 23, 50), "2039-02-27 23:50".to_datetime
    assert_equal 0, "2039-02-27 23:50".to_datetime.offset # use UTC offset
    assert_equal ::Date::ITALY, "2039-02-27 23:50".to_datetime.start # use Ruby's default start value
    assert_equal DateTime.civil(2039, 2, 27, 23, 50, 19 + Rational(275038, 1000000), "-04:00"), "2039-02-27T23:50:19.275038-04:00".to_datetime
    assert_nil "".to_datetime
  end

  def test_partial_string_to_datetime
    now = DateTime.now
    assert_equal DateTime.civil(now.year, now.month, now.day, 23, 50), "23:50".to_datetime
    assert_equal DateTime.civil(now.year, now.month, now.day, 23, 50, 0, "-04:00"), "23:50 -0400".to_datetime
  end

  def test_string_to_date
    assert_equal Date.new(2005, 2, 27), "2005-02-27".to_date
    assert_nil "".to_date
    assert_equal Date.new(Date.today.year, 2, 3), "Feb 3rd".to_date
  end

  protected
    def with_env_tz(new_tz = 'US/Eastern')
      old_tz, ENV['TZ'] = ENV['TZ'], new_tz
      yield
    ensure
      old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
    end
end

class StringBehaviourTest < ActiveSupport::TestCase
  def test_acts_like_string
    assert 'Bambi'.acts_like_string?
  end
end

class CoreExtStringMultibyteTest < ActiveSupport::TestCase
  UTF8_STRING = 'こにちわ'
  ASCII_STRING = 'ohayo'.encode('US-ASCII')
  EUC_JP_STRING = 'さよなら'.encode('EUC-JP')
  INVALID_UTF8_STRING = "\270\236\010\210\245"

  def test_core_ext_adds_mb_chars
    assert_respond_to UTF8_STRING, :mb_chars
  end

  def test_string_should_recognize_utf8_strings
    assert UTF8_STRING.is_utf8?
    assert ASCII_STRING.is_utf8?
    assert !EUC_JP_STRING.is_utf8?
    assert !INVALID_UTF8_STRING.is_utf8?
  end

  def test_mb_chars_returns_instance_of_proxy_class
    assert_kind_of ActiveSupport::Multibyte.proxy_class, UTF8_STRING.mb_chars
  end
end

class OutputSafetyTest < ActiveSupport::TestCase
  def setup
    @string = "hello"
    @object = Class.new(Object) do
      def to_s
        "other"
      end
    end.new
  end

  test "A string is unsafe by default" do
    assert !@string.html_safe?
  end

  test "A string can be marked safe" do
    string = @string.html_safe
    assert string.html_safe?
  end

  test "Marking a string safe returns the string" do
    assert_equal @string, @string.html_safe
  end

  test "A fixnum is safe by default" do
    assert 5.html_safe?
  end

  test "a float is safe by default" do
    assert 5.7.html_safe?
  end

  test "An object is unsafe by default" do
    assert !@object.html_safe?
  end

  test "Adding an object to a safe string returns a safe string" do
    string = @string.html_safe
    string << @object

    assert_equal "helloother", string
    assert string.html_safe?
  end

  test "Adding a safe string to another safe string returns a safe string" do
    @other_string = "other".html_safe
    string = @string.html_safe
    @combination = @other_string + string

    assert_equal "otherhello", @combination
    assert @combination.html_safe?
  end

  test "Adding an unsafe string to a safe string escapes it and returns a safe string" do
    @other_string = "other".html_safe
    @combination = @other_string + "<foo>"
    @other_combination = @string + "<foo>"

    assert_equal "other&lt;foo&gt;", @combination
    assert_equal "hello<foo>", @other_combination

    assert @combination.html_safe?
    assert !@other_combination.html_safe?
  end

  test "Concatting safe onto unsafe yields unsafe" do
    @other_string = "other"

    string = @string.html_safe
    @other_string.concat(string)
    assert !@other_string.html_safe?
  end

  test "Concatting unsafe onto safe yields escaped safe" do
    @other_string = "other".html_safe
    string = @other_string.concat("<foo>")
    assert_equal "other&lt;foo&gt;", string
    assert string.html_safe?
  end

  test "Concatting safe onto safe yields safe" do
    @other_string = "other".html_safe
    string = @string.html_safe

    @other_string.concat(string)
    assert @other_string.html_safe?
  end

  test "Concatting safe onto unsafe with << yields unsafe" do
    @other_string = "other"
    string = @string.html_safe

    @other_string << string
    assert !@other_string.html_safe?
  end

  test "Concatting unsafe onto safe with << yields escaped safe" do
    @other_string = "other".html_safe
    string = @other_string << "<foo>"
    assert_equal "other&lt;foo&gt;", string
    assert string.html_safe?
  end

  test "Concatting safe onto safe with << yields safe" do
    @other_string = "other".html_safe
    string = @string.html_safe

    @other_string << string
    assert @other_string.html_safe?
  end

  test "Concatting safe onto unsafe with % yields unsafe" do
    @other_string = "other%s"
    string = @string.html_safe

    @other_string = @other_string % string
    assert !@other_string.html_safe?
  end

  test "Concatting unsafe onto safe with % yields escaped safe" do
    @other_string = "other%s".html_safe
    string = @other_string % "<foo>"

    assert_equal "other&lt;foo&gt;", string
    assert string.html_safe?
  end

  test "Concatting safe onto safe with % yields safe" do
    @other_string = "other%s".html_safe
    string = @string.html_safe

    @other_string = @other_string % string
    assert @other_string.html_safe?
  end

  test "Concatting with % doesn't modify a string" do
    @other_string = ["<p>", "<b>", "<h1>"]
    _ = "%s %s %s".html_safe % @other_string

    assert_equal ["<p>", "<b>", "<h1>"], @other_string
  end

  test "Concatting a fixnum to safe always yields safe" do
    string = @string.html_safe
    string = string.concat(13)
    assert_equal "hello".concat(13), string
    assert string.html_safe?
  end

  test 'emits normal string yaml' do
    assert_equal 'foo'.to_yaml, 'foo'.html_safe.to_yaml(:foo => 1)
  end

  test "call to_param returns a normal string" do
    string = @string.html_safe
    assert string.html_safe?
    assert !string.to_param.html_safe?
  end

  test "ERB::Util.html_escape should escape unsafe characters" do
    string = '<>&"\''
    expected = '&lt;&gt;&amp;&quot;&#39;'
    assert_equal expected, ERB::Util.html_escape(string)
  end

  test "ERB::Util.html_escape should correctly handle invalid UTF-8 strings" do
    string = [192, 60].pack('CC')
    expected = 192.chr + "&lt;"
    assert_equal expected, ERB::Util.html_escape(string)
  end

  test "ERB::Util.html_escape should not escape safe strings" do
    string = "<b>hello</b>".html_safe
    assert_equal string, ERB::Util.html_escape(string)
  end
end

class StringExcludeTest < ActiveSupport::TestCase
  test 'inverse of #include' do
    assert_equal false, 'foo'.exclude?('o')
    assert_equal true, 'foo'.exclude?('p')
  end
end

class StringIndentTest < ActiveSupport::TestCase
  test 'does not indent strings that only contain newlines (edge cases)' do
    ['', "\n", "\n" * 7].each do |str|
      assert_nil str.indent!(8)
      assert_equal str, str.indent(8)
      assert_equal str, str.indent(1, "\t")
    end
  end

  test "by default, indents with spaces if the existing indentation uses them" do
    assert_equal "    foo\n      bar", "foo\n  bar".indent(4)
  end

  test "by default, indents with tabs if the existing indentation uses them" do
    assert_equal "\tfoo\n\t\t\bar", "foo\n\t\bar".indent(1)
  end

  test "by default, indents with spaces as a fallback if there is no indentation" do
    assert_equal "   foo\n   bar\n   baz", "foo\nbar\nbaz".indent(3)
  end

  # Nothing is said about existing indentation that mixes spaces and tabs, so
  # there is nothing to test.

  test 'uses the indent char if passed' do
    assert_equal <<EXPECTED, <<ACTUAL.indent(4, '.')
....  def some_method(x, y)
....    some_code
....  end
EXPECTED
  def some_method(x, y)
    some_code
  end
ACTUAL

    assert_equal <<EXPECTED, <<ACTUAL.indent(2, '&nbsp;')
&nbsp;&nbsp;&nbsp;&nbsp;def some_method(x, y)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;some_code
&nbsp;&nbsp;&nbsp;&nbsp;end
EXPECTED
&nbsp;&nbsp;def some_method(x, y)
&nbsp;&nbsp;&nbsp;&nbsp;some_code
&nbsp;&nbsp;end
ACTUAL
  end

  test "does not indent blank lines by default" do
    assert_equal " foo\n\n bar", "foo\n\nbar".indent(1)
  end

  test 'indents blank lines if told so' do
    assert_equal " foo\n \n bar", "foo\n\nbar".indent(1, nil, true)
  end
end