Module: Test::Unit::Assertions

Included in:
TestCase
Defined in:
lib/test/unit/assertions.rb

Overview

Test::Unit::Assertions contains the standard Test::Unit assertions. Assertions is included in Test::Unit::TestCase.

To include it in your own code and use its functionality, you simply need to rescue Test::Unit::AssertionFailedError. Additionally you may override add_assertion to get notified whenever an assertion is made.

Notes:

  • The message to each assertion, if given, will be propagated with the failure.

  • It is easy to add your own assertions based on assert_block().

Example Custom Assertion

def deny(boolean, message = nil)
  message = build_message message, '<?> is not false or nil.', boolean
  assert_block message do
    not boolean
  end
end

Defined Under Namespace

Classes: AssertionMessage

Constant Summary collapse

UncaughtThrow = 
{NameError => /^uncaught throw \`(.+)\'$/,
ThreadError => /^uncaught throw \`(.+)\' in thread /}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.use_pp=(value) ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 517

def self.use_pp=(value)
  AssertionMessage.use_pp = value
end

Instance Method Details

#assert(boolean, message = nil) ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 60

def assert(boolean, message=nil)
  _wrap_assertion do
    assert_block("assert should not be called with a block.") { !block_given? }
    assert_block(build_message(message, "<?> is not true.", boolean)) { boolean }
  end
end

#assert_block(message = "assert_block failed.") ⇒ Object

:yields:



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# File 'lib/test/unit/assertions.rb', line 45

def assert_block(message="assert_block failed.") # :yields: 
  _wrap_assertion do
    if (! yield)
      raise AssertionFailedError.new(message.to_s)
    end
  end
end

#assert_equal(expected, actual, message = nil) ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 78

def assert_equal(expected, actual, message=nil)
  full_message = build_message(message, <<EOT, expected, actual)
<?> expected but was
<?>.
EOT
  assert_block(full_message) { expected == actual }
end

#assert_in_delta(expected_float, actual_float, delta, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 439

def assert_in_delta(expected_float, actual_float, delta, message="")
  _wrap_assertion do
    {expected_float => "first float", actual_float => "second float", delta => "delta"}.each do |float, name|
      assert_respond_to(float, :to_f, "The arguments must respond to to_f; the #{name} did not")
    end
    assert_operator(delta, :>=, 0.0, "The delta should not be negative")
    full_message = build_message(message, <<EOT, expected_float, actual_float, delta)
<?> and
<?> expected to be within
<?> of each other.
EOT
    assert_block(full_message) { (expected_float.to_f - actual_float.to_f).abs <= delta.to_f }
  end
end

#assert_instance_of(klass, object, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 152

def assert_instance_of(klass, object, message="")
  _wrap_assertion do
    assert_equal(Class, klass.class, "assert_instance_of takes a Class as its first argument")
    full_message = build_message(message, <<EOT, object, klass, object.class)
<?> expected to be an instance of
<?> but was
<?>.
EOT
    assert_block(full_message){object.instance_of?(klass)}
  end
end

#assert_kind_of(klass, object, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 182

def assert_kind_of(klass, object, message="")
  _wrap_assertion do
    assert(klass.kind_of?(Module), "The first parameter to assert_kind_of should be a kind_of Module.")
    full_message = build_message(message, "<?>\nexpected to be kind_of\\?\n<?> but was\n<?>.", object, klass, object.class)
    assert_block(full_message){object.kind_of?(klass)}
  end
end

#assert_match(pattern, string, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 220

def assert_match(pattern, string, message="")
  _wrap_assertion do
    pattern = case(pattern)
      when String
        Regexp.new(Regexp.escape(pattern))
      else
        pattern
    end
    full_message = build_message(message, "<?> expected to be =~\n<?>.", string, pattern)
    assert_block(full_message) { string =~ pattern }
  end
end

#assert_nil(object, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 171

def assert_nil(object, message="")
  assert_equal(nil, object, message)
end

#assert_no_match(regexp, string, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 364

def assert_no_match(regexp, string, message="")
  _wrap_assertion do
    assert_instance_of(Regexp, regexp, "The first argument to assert_no_match should be a Regexp.")
    full_message = build_message(message, "<?> expected to not match\n<?>.", regexp, string)
    assert_block(full_message) { regexp !~ string }
  end
end

#assert_not_equal(expected, actual, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 340

def assert_not_equal(expected, actual, message="")
  full_message = build_message(message, "<?> expected to be != to\n<?>.", expected, actual)
  assert_block(full_message) { expected != actual }
end

#assert_not_nil(object, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 352

def assert_not_nil(object, message="")
  full_message = build_message(message, "<?> expected to not be nil.", object)
  assert_block(full_message){!object.nil?}
end

#assert_not_same(expected, actual, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 323

def assert_not_same(expected, actual, message="")
  full_message = build_message(message, <<EOT, expected, expected.__id__, actual, actual.__id__)
<?>
with id <?> expected to not be equal\\? to
<?>
with id <?>.
EOT
  assert_block(full_message) { !actual.equal?(expected) }
end

#assert_nothing_raised(*args) ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 283

def assert_nothing_raised(*args)
  _wrap_assertion do
    if Module === args.last
      message = ""
    else
      message = args.pop
    end
    exceptions, modules = _check_exception_class(args)
    begin
      yield
    rescue Exception => e
      if ((args.empty? && !e.instance_of?(AssertionFailedError)) ||
          _expected_exception?(e, exceptions, modules))
        assert_block(build_message(message, "Exception raised:\n?", e)){false}
      else
        raise
      end
    end
    nil
  end
end

#assert_nothing_thrown(message = "", &proc) ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 415

def assert_nothing_thrown(message="", &proc)
  _wrap_assertion do
    assert(block_given?, "Should have passed a block to assert_nothing_thrown")
    begin
      proc.call
    rescue NameError, ThreadError => error
      if UncaughtThrow[error.class] !~ error.message
        raise error
      end
      full_message = build_message(message, "<?> was thrown when nothing was expected", $1.intern)
      flunk(full_message)
    end
    assert(true, "Expected nothing to be thrown")
  end
end

#assert_operator(object1, operator, object2, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 261

def assert_operator(object1, operator, object2, message="")
  _wrap_assertion do
    full_message = build_message(nil, "<?>\ngiven as the operator for #assert_operator must be a Symbol or #respond_to\\?(:to_str).", operator)
    assert_block(full_message){operator.kind_of?(Symbol) || operator.respond_to?(:to_str)}
    full_message = build_message(message, <<EOT, object1, AssertionMessage.literal(operator), object2)
<?> expected to be
?
<?>.
EOT
    assert_block(full_message) { object1.__send__(operator, object2) }
  end
end

#assert_raise(*args) ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 110

def assert_raise(*args)
  _wrap_assertion do
    if Module === args.last
      message = ""
    else
      message = args.pop
    end
    exceptions, modules = _check_exception_class(args)
    expected = args.size == 1 ? args.first : args
    actual_exception = nil
    full_message = build_message(message, "<?> exception expected but none was thrown.", expected)
    assert_block(full_message) do
      begin
        yield
      rescue Exception => actual_exception
        break
      end
      false
    end
    full_message = build_message(message, "<?> exception expected but was\n?", expected, actual_exception)
    assert_block(full_message) {_expected_exception?(actual_exception, exceptions, modules)}
    actual_exception
  end
end

#assert_raises(*args, &block) ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 141

def assert_raises(*args, &block)
  assert_raise(*args, &block)
end

#assert_respond_to(object, method, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 197

def assert_respond_to(object, method, message="")
  _wrap_assertion do
    full_message = build_message(nil, "<?>\ngiven as the method name argument to #assert_respond_to must be a Symbol or #respond_to\\?(:to_str).", method)

    assert_block(full_message) do
      method.kind_of?(Symbol) || method.respond_to?(:to_str)
    end
    full_message = build_message(message, <<EOT, object, object.class, method)
<?>
of type <?>
expected to respond_to\\?<?>.
EOT
    assert_block(full_message) { object.respond_to?(method) }
  end
end

#assert_same(expected, actual, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 242

def assert_same(expected, actual, message="")
  full_message = build_message(message, <<EOT, expected, expected.__id__, actual, actual.__id__)
<?>
with id <?> expected to be equal\\? to
<?>
with id <?>.
EOT
  assert_block(full_message) { actual.equal?(expected) }
end

#assert_send(send_array, message = "") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 466

def assert_send(send_array, message="")
  _wrap_assertion do
    assert_instance_of(Array, send_array, "assert_send requires an array of send information")
    assert(send_array.size >= 2, "assert_send requires at least a receiver and a message name")
    full_message = build_message(message, <<EOT, send_array[0], AssertionMessage.literal(send_array[1].to_s), send_array[2..-1])
<?> expected to respond to
<?(?)> with a true value.
EOT
    assert_block(full_message) { send_array[0].__send__(send_array[1], *send_array[2..-1]) }
  end
end

#assert_throws(expected_symbol, message = "", &proc) ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 384

def assert_throws(expected_symbol, message="", &proc)
  _wrap_assertion do
    assert_instance_of(Symbol, expected_symbol, "assert_throws expects the symbol that should be thrown for its first argument")
    assert_block("Should have passed a block to assert_throws."){block_given?}
    caught = true
    begin
      catch(expected_symbol) do
        proc.call
        caught = false
      end
      full_message = build_message(message, "<?> should have been thrown.", expected_symbol)
      assert_block(full_message){caught}
    rescue NameError, ThreadError => error
      if UncaughtThrow[error.class] !~ error.message
        raise error
      end
      full_message = build_message(message, "<?> expected to be thrown but\n<?> was thrown.", expected_symbol, $1.intern)
      flunk(full_message)
    end
  end
end

#build_message(head, template = nil, *arguments) ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 483

def build_message(head, template=nil, *arguments)
  template &&= template.chomp
  return AssertionMessage.new(head, template, arguments)
end

#flunk(message = "Flunked") ⇒ Object 



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# File 'lib/test/unit/assertions.rb', line 312

def flunk(message="Flunked")
  assert_block(build_message(message)){false}
end