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().

Examples:

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: AssertExceptionHelper, AssertionMessage, ThrowTagExtractor

Constant Summary collapse

NOT_SPECIFIED =
Object.new

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.use_pp=(value) ⇒ Object

Select whether or not to use the pretty-printer. If this option is set to false before any assertions are made, pp.rb will not be required.


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# File 'lib/test/unit/assertions.rb', line 1654

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

Instance Method Details

#add_assertionvoid

This method returns an undefined value.

Called whenever an assertion is made. Define this in classes that include Test::Unit::Assertions to record assertion counts.

This is a public API for developers who extend test-unit.


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# File 'lib/test/unit/assertions.rb', line 1648

def add_assertion
end

#assert(object, message = nil) ⇒ void #assert(message = nil) { ... } ⇒ void

Overloads:

  • #assert(object, message = nil) ⇒ void

    This method returns an undefined value.

    Asserts that object is not false nor nil.

    Normally, you don't need to use this assertion. Use more specific assertions such as #assert_equal and

    assert_include.

    Examples:

    Pass patterns

    assert(true)               # => pass
    assert([1, 2].include?(1)) # => pass

    Failure patterns

    assert(nil)                # => failure
    assert(false)              # => failure
    assert([1, 2].include?(5)) # => failure

    Parameters:

    • object (Object)

      The check target.

    • message (String) (defaults to: nil)

      The additional user message. It is showed when the assertion is failed.

  • #assert(message = nil) { ... } ⇒ void

    This method returns an undefined value.

    Asserts that the givens block returns not false nor nil.

    This style uses Power Assert. It means that you can see each object values in method chains on failure. See the following example about Power Assert.

    We recommend you to use Power Assert for predicate method checks rather than existing assertions such as

    assert_include and #assert_predicate. Power Assert shows

    useful message for debugging.

    We don't recommend you use Power Assert for equality check. You should use #assert_equal for the case. Because

    assert_equal shows more useful message for debugging.

    Examples:

    Power Assert

    coins = [1, 5, 50]
    target_coin = 10
    assert do
      coins.include?(target_coin)
    end
    # =>
    #  coins.include?(target_coin)
    #  |     |        |
    #  |     |        10
    #  |     false
    #  [1, 5, 50]

    Pass patterns

    assert {true}               # => pass
    assert {[1, 2].include?(1)} # => pass

    Failure patterns

    assert {nil}                # => failure
    assert {false}              # => failure
    assert {[1, 2].include?(5)} # => failure

    Parameters:

    • message (String) (defaults to: nil)

      The additional user message. It is showed when the assertion is failed.

    Yields:

    • [] Given no parameters to the block.

    Yield Returns:

    • (Object)

      The checked object.


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# File 'lib/test/unit/assertions.rb', line 133

def assert(object=NOT_SPECIFIED, message=nil, &block)
  _wrap_assertion do
    have_object = !NOT_SPECIFIED.equal?(object)
    if block
      message = object if have_object
      if defined?(PowerAssert)
        PowerAssert.start(block, :assertion_method => __callee__) do |pa|
          pa_message = AssertionMessage.delayed_literal(&pa.message_proc)
          assertion_message = build_message(message, "?", pa_message)
          assert_block(assertion_message) do
            pa.yield
          end
        end
      else
        assert(yield, message)
      end
    else
      unless have_object
        raise ArgumentError, "wrong number of arguments (0 for 1..2)"
      end
      assertion_message = nil
      case message
      when nil, String, Proc
      when AssertionMessage
        assertion_message = message
      else
        error_message = "assertion message must be String, Proc or "
        error_message += "#{AssertionMessage}: "
        error_message += "<#{message.inspect}>(<#{message.class}>)"
        raise ArgumentError, error_message, filter_backtrace(caller)
      end
      assertion_message ||= build_message(message,
                                          "<?> is not true.",
                                          object)
      assert_block(assertion_message) do
        object
      end
    end
  end
end

#assert_alias_method(object, alias_name, original_name, message = nil) ⇒ Object

Passes if object#alias_name is an alias method of object#original_name.

Examples:

assert_alias_method([], :length, :size)  # -> pass
assert_alias_method([], :size, :length)  # -> pass
assert_alias_method([], :each, :size)    # -> fail

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# File 'lib/test/unit/assertions.rb', line 1429

def assert_alias_method(object, alias_name, original_name, message=nil)
  _wrap_assertion do
    find_method_failure_message = Proc.new do |method_name|
      build_message(message,
                    "<?>.? doesn't exist\n" +
                    "(Class: <?>)",
                    object,
                    AssertionMessage.literal(method_name),
                    object.class)
    end

    alias_method = original_method = nil
    assert_block(find_method_failure_message.call(alias_name)) do
      begin
        alias_method = object.method(alias_name)
        true
      rescue NameError
        false
      end
    end
    assert_block(find_method_failure_message.call(original_name)) do
      begin
        original_method = object.method(original_name)
        true
      rescue NameError
        false
      end
    end

    full_message = build_message(message,
                                 "<?> is alias of\n" +
                                 "<?> expected",
                                 alias_method,
                                 original_method)
    assert_block(full_message) do
      alias_method == original_method
    end
  end
end

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

The assertion upon which all other assertions are based. Passes if the block yields true.

Examples:

assert_block "Couldn't do the thing" do
  do_the_thing
end

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# File 'lib/test/unit/assertions.rb', line 52

def assert_block(message="assert_block failed.")
  _wrap_assertion do
    if (! yield)
      options = {}
      if message.respond_to?(:user_message)
        options[:user_message] = message.user_message
      end
      raise AssertionFailedError.new(message.to_s, options)
    end
  end
end

#assert_boolean(actual, message = nil) ⇒ Object

Passes if actual is a boolean value.

Examples:

assert_boolean(true) # -> pass
assert_boolean(nil)  # -> fail

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# File 'lib/test/unit/assertions.rb', line 1200

def assert_boolean(actual, message=nil)
  _wrap_assertion do
    assert_block(build_message(message,
                               "<true> or <false> expected but was\n<?>",
                               actual)) do
      [true, false].include?(actual)
    end
  end
end

#assert_compare(expected, operator, actual, message = nil) ⇒ Object

Passes if expression "expected operator actual" is true.

Examples:

assert_compare(1, "<", 10)  # -> pass
assert_compare(1, ">=", 10) # -> fail

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# File 'lib/test/unit/assertions.rb', line 1249

def assert_compare(expected, operator, actual, message=nil)
  _wrap_assertion do
    assert_send([["<", "<=", ">", ">="], :include?, operator.to_s])
    case operator.to_s
    when "<"
      operator_description = "less than"
    when "<="
      operator_description = "less than or equal to"
    when ">"
      operator_description = "greater than"
    when ">="
      operator_description = "greater than or equal to"
    end
    template = <<-EOT
<?> #{operator} <?> should be true
<?> was expected to be #{operator_description}
<?>.
EOT
    full_message = build_message(message, template,
                                 expected, actual,
                                 expected, actual)
    assert_block(full_message) do
      expected.__send__(operator, actual)
    end
  end
end

#assert_const_defined(object, constant_name, message = nil) ⇒ Object

Passes if object.const_defined?(constant_name)

Examples:

assert_const_defined(Test, :Unit)          # -> pass
assert_const_defined(Object, :Nonexistent) # -> fail

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# File 'lib/test/unit/assertions.rb', line 1344

def assert_const_defined(object, constant_name, message=nil)
  _wrap_assertion do
    full_message = build_message(message,
                                 "<?>.const_defined\\?(<?>) expected.",
                                 object, constant_name)
    assert_block(full_message) do
      object.const_defined?(constant_name)
    end
  end
end

#assert_empty(object, message = nil) ⇒ Object

Passes if object is empty.

Examples:

assert_empty("")                       # -> pass
assert_empty([])                       # -> pass
assert_empty({})                       # -> pass
assert_empty(" ")                      # -> fail
assert_empty([nil])                    # -> fail
assert_empty({1 => 2})                 # -> fail

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# File 'lib/test/unit/assertions.rb', line 1574

def assert_empty(object, message=nil)
  _wrap_assertion do
    assert_respond_to(object, :empty?,
                      "The object must respond to :empty?.")
    full_message = build_message(message,
                                 "<?> was expected to be empty.",
                                 object)
    assert_block(full_message) do
      object.empty?
    end
  end
end

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

Passes if expected == actual.

Note that the ordering of arguments is important, since a helpful error message is generated when this one fails that tells you the values of expected and actual.

Examples:

assert_equal 'MY STRING', 'my string'.upcase

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# File 'lib/test/unit/assertions.rb', line 224

def assert_equal(expected, actual, message=nil)
  diff = AssertionMessage.delayed_diff(expected, actual)
  if expected.respond_to?(:encoding) and
      actual.respond_to?(:encoding) and
      expected.encoding != actual.encoding
    format = <<EOT
<?>(?) expected but was
<?>(?).?
EOT
    full_message = build_message(message, format,
                                 expected, expected.encoding.name,
                                 actual, actual.encoding.name,
                                 diff)
  else
    full_message = build_message(message, <<EOT, expected, actual, diff)
<?> expected but was
<?>.?
EOT
  end
  begin
    assert_block(full_message) { expected == actual }
  rescue AssertionFailedError => failure
    _set_failed_information(failure, expected, actual)
    raise failure # For JRuby. :<
  end
end

#assert_fail_assertion(message = nil) ⇒ Object

Passes if assertion is failed in block.

Examples:

assert_fail_assertion {assert_equal("A", "B")}  # -> pass
assert_fail_assertion {assert_equal("A", "A")}  # -> fail

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# File 'lib/test/unit/assertions.rb', line 1282

def assert_fail_assertion(message=nil)
  _wrap_assertion do
    full_message = build_message(message,
                                 "Failed assertion was expected.")
    assert_block(full_message) do
      begin
        yield
        false
      rescue AssertionFailedError
        true
      end
    end
  end
end

#assert_false(actual, message = nil) ⇒ Object

Passes if actual is false.

Examples:

assert_false(false)  # -> pass
assert_false(nil)    # -> fail

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# File 'lib/test/unit/assertions.rb', line 1232

def assert_false(actual, message=nil)
  _wrap_assertion do
    assert_block(build_message(message,
                               "<false> expected but was\n<?>",
                               actual)) do
      actual == false
    end
  end
end

#assert_in_delta(expected_float, actual_float, delta = 0.001, message = "") ⇒ Object

Passes if expected_float and actual_float are equal within delta tolerance.

Examples:

assert_in_delta 0.05, (50000.0 / 10**6), 0.00001

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# File 'lib/test/unit/assertions.rb', line 861

def assert_in_delta(expected_float, actual_float, delta=0.001, message="")
  _wrap_assertion do
    _assert_in_delta_validate_arguments(expected_float,
                                        actual_float,
                                        delta)
    full_message = _assert_in_delta_message(expected_float,
                                            actual_float,
                                            delta,
                                            message)
    assert_block(full_message) do
      (expected_float.to_f - actual_float.to_f).abs <= delta.to_f
    end
  end
end

#assert_in_epsilon(expected_float, actual_float, epsilon = 0.001, message = "") ⇒ Object

Passes if expected_float and actual_float are equal within epsilon relative error of expected_float.

Examples:

assert_in_epsilon(10000.0, 9900.0, 0.1) # -> pass
assert_in_epsilon(10000.0, 9899.0, 0.1) # -> fail

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# File 'lib/test/unit/assertions.rb', line 983

def assert_in_epsilon(expected_float, actual_float, epsilon=0.001,
                      message="")
  _wrap_assertion do
    _assert_in_epsilon_validate_arguments(expected_float,
                                          actual_float,
                                          epsilon)
    full_message = _assert_in_epsilon_message(expected_float,
                                              actual_float,
                                              epsilon,
                                              message)
    assert_block(full_message) do
      normalized_expected_float = expected_float.to_f
      if normalized_expected_float.zero?
        delta = epsilon.to_f ** 2
      else
        delta = normalized_expected_float * epsilon.to_f
      end
      delta = delta.abs
      (normalized_expected_float - actual_float.to_f).abs <= delta
    end
  end
end

#assert_include(collection, object, message = nil) ⇒ Object Also known as: assert_includes

Passes if collection includes object.

Examples:

assert_include([1, 10], 1)            # -> pass
assert_include(1..10, 5)              # -> pass
assert_include([1, 10], 5)            # -> fail
assert_include(1..10, 20)             # -> fail

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# File 'lib/test/unit/assertions.rb', line 1513

def assert_include(collection, object, message=nil)
  _wrap_assertion do
    assert_respond_to(collection, :include?,
                      "The collection must respond to :include?.")
    full_message = build_message(message,
                                 "<?> was expected to include\n<?>.",
                                 collection,
                                 object)
    assert_block(full_message) do
      collection.include?(object)
    end
  end
end

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

Passes if object.instance_of?(klass). When klass is an array of classes, it passes if any class satisfies +object.instance_of?(class).

Examples:

assert_instance_of(String, 'foo')            # -> pass
assert_instance_of([Fixnum, NilClass], 100)  # -> pass
assert_instance_of([Numeric, NilClass], 100) # -> fail

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# File 'lib/test/unit/assertions.rb', line 325

def assert_instance_of(klass, object, message=nil)
  _wrap_assertion do
    if klass.is_a?(Array)
      klasses = klass
    else
      klasses = [klass]
    end
    assert_block("The first parameter to assert_instance_of should be " +
                 "a Class or an Array of Class.") do
      klasses.all? {|k| k.is_a?(Class)}
    end
    klass_message = AssertionMessage.maybe_container(klass) do |value|
      "<#{value}>"
    end
    full_message = build_message(message, <<EOT, object, klass_message, object.class)
<?> was expected to be instance_of\\?
? but was
<?>.
EOT
    assert_block(full_message) do
      klasses.any? {|k| object.instance_of?(k)}
    end
  end
end

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

Passes if object.kind_of?(klass). When klass is an array of classes or modules, it passes if any class or module satisfies +object.kind_of?(class_or_module).

Examples:

assert_kind_of(Object, 'foo')                # -> pass
assert_kind_of([Fixnum, NilClass], 100)      # -> pass
assert_kind_of([Fixnum, NilClass], "string") # -> fail

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# File 'lib/test/unit/assertions.rb', line 412

def assert_kind_of(klass, object, message=nil)
  _wrap_assertion do
    if klass.is_a?(Array)
      klasses = klass
    else
      klasses = [klass]
    end
    assert_block("The first parameter to assert_kind_of should be " +
                 "a kind_of Module or an Array of a kind_of Module.") do
      klasses.all? {|k| k.kind_of?(Module)}
    end
    klass_message = AssertionMessage.maybe_container(klass) do |value|
      "<#{value}>"
    end
    full_message = build_message(message,
                                 "<?> was expected to be kind_of\\?\n" +
                                 "? but was\n" +
                                 "<?>.",
                                 object,
                                 klass_message,
                                 object.class)
    assert_block(full_message) do
      klasses.any? {|k| object.kind_of?(k)}
    end
  end
end

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

Passes if pattern =~ string.

Examples:

assert_match(/\d+/, 'five, 6, seven')

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# File 'lib/test/unit/assertions.rb', line 535

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

#assert_nil(object, message = nil) ⇒ Object

Passes if object is nil.

Examples:

assert_nil [1, 2].uniq!

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# File 'lib/test/unit/assertions.rb', line 396

def assert_nil(object, message=nil)
  full_message = build_message(message, <<EOT, object)
<?> was expected to be nil.
EOT
  assert_block(full_message) { object.nil? }
end

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

Deprecated. Use #assert_not_match instead.

Passes if regexp !~ string

Examples:

assert_no_match(/two/, 'one 2 three')   # -> pass
assert_no_match(/three/, 'one 2 three') # -> fail

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# File 'lib/test/unit/assertions.rb', line 732

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.")
    assert_not_match(regexp, string, message)
  end
end

#assert_not_const_defined(object, constant_name, message = nil) ⇒ Object

Passes if !object.const_defined?(constant_name)

Examples:

assert_not_const_defined(Object, :Nonexistent) # -> pass
assert_not_const_defined(Test, :Unit)          # -> fail

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# File 'lib/test/unit/assertions.rb', line 1361

def assert_not_const_defined(object, constant_name, message=nil)
  _wrap_assertion do
    full_message = build_message(message,
                                 "!<?>.const_defined\\?(<?>) expected.",
                                 object, constant_name)
    assert_block(full_message) do
      !object.const_defined?(constant_name)
    end
  end
end

#assert_not_empty(object, message = nil) ⇒ Object Also known as: refute_empty

Passes if object is not empty.

Examples:

assert_not_empty(" ")                      # -> pass
assert_not_empty([nil])                    # -> pass
assert_not_empty({1 => 2})                 # -> pass
assert_not_empty("")                       # -> fail
assert_not_empty([])                       # -> fail
assert_not_empty({})                       # -> fail

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# File 'lib/test/unit/assertions.rb', line 1597

def assert_not_empty(object, message=nil)
  _wrap_assertion do
    assert_respond_to(object, :empty?,
                      "The object must respond to :empty?.")
    full_message = build_message(message,
                                 "<?> was expected to not be empty.",
                                 object)
    assert_block(full_message) do
      not object.empty?
    end
  end
end

#assert_not_equal(expected, actual, message = nil) ⇒ Object Also known as: refute_equal

Passes if expected != actual

Examples:

assert_not_equal 'some string', 5

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# File 'lib/test/unit/assertions.rb', line 674

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

#assert_not_in_delta(expected_float, actual_float, delta = 0.001, message = "") ⇒ Object Also known as: refute_in_delta

Passes if expected_float and actual_float are not equal within delta tolerance.

Examples:

assert_not_in_delta(0.05, (50000.0 / 10**6), 0.00002) # -> pass
assert_not_in_delta(0.05, (50000.0 / 10**6), 0.00001) # -> fail

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# File 'lib/test/unit/assertions.rb', line 883

def assert_not_in_delta(expected_float, actual_float, delta=0.001, message="")
  _wrap_assertion do
    _assert_in_delta_validate_arguments(expected_float,
                                        actual_float,
                                        delta)
    full_message = _assert_in_delta_message(expected_float,
                                            actual_float,
                                            delta,
                                            message,
                                            :negative_assertion => true)
    assert_block(full_message) do
      (expected_float.to_f - actual_float.to_f).abs > delta.to_f
    end
  end
end

#assert_not_in_epsilon(expected_float, actual_float, epsilon = 0.001, message = "") ⇒ Object Also known as: refute_in_epsilon

Passes if expected_float and actual_float are not equal within epsilon relative error of expected_float.

Examples:

assert_not_in_epsilon(10000.0, 9900.0, 0.1) # -> fail
assert_not_in_epsilon(10000.0, 9899.0, 0.1) # -> pass

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# File 'lib/test/unit/assertions.rb', line 1014

def assert_not_in_epsilon(expected_float, actual_float, epsilon=0.001,
                          message="")
  _wrap_assertion do
    _assert_in_epsilon_validate_arguments(expected_float,
                                          actual_float,
                                          epsilon)
    full_message = _assert_in_epsilon_message(expected_float,
                                              actual_float,
                                              epsilon,
                                              message,
                                              :negative_assertion => true)
    assert_block(full_message) do
      normalized_expected_float = expected_float.to_f
      delta = normalized_expected_float * epsilon.to_f
      (normalized_expected_float - actual_float.to_f).abs > delta
    end
  end
end

#assert_not_include(collection, object, message = nil) ⇒ Object Also known as: assert_not_includes, refute_includes

Passes if collection doesn't include object.

Examples:

assert_not_include([1, 10], 5)            # -> pass
assert_not_include(1..10, 20)             # -> pass
assert_not_include([1, 10], 1)            # -> fail
assert_not_include(1..10, 5)              # -> fail

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# File 'lib/test/unit/assertions.rb', line 1540

def assert_not_include(collection, object, message=nil)
  _wrap_assertion do
    assert_respond_to(collection, :include?,
                      "The collection must respond to :include?.")
    full_message = build_message(message,
                                 "<?> was expected to not include\n<?>.",
                                 collection,
                                 object)
    assert_block(full_message) do
      not collection.include?(object)
    end
  end
end

#assert_not_instance_of(klass, object, message = nil) ⇒ Object Also known as: refute_instance_of

Passes if object.instance_of?(klass) does not hold. When klass is an array of classes, it passes if no class satisfies +object.instance_of?(class).

Examples:

assert_not_instance_of(String, 100)                # -> pass
assert_not_instance_of([Fixnum, NilClass], '100')  # -> pass
assert_not_instance_of([Numeric, NilClass], 100)   # -> fail

Since:

  • 3.0.0


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# File 'lib/test/unit/assertions.rb', line 361

def assert_not_instance_of(klass, object, message=nil)
  _wrap_assertion do
    if klass.is_a?(Array)
      klasses = klass
    else
      klasses = [klass]
    end
    assert_block("The first parameter to assert_not_instance_of should be " +
                 "a Class or an Array of Class.") do
      klasses.all? {|k| k.is_a?(Class)}
    end
    klass_message = AssertionMessage.maybe_container(klass) do |value|
      "<#{value}>"
    end
    full_message = build_message(message,
                                 "<?> was expected to not be instance_of\\?\n" +
                                 "? but was.",
                                 object,
                                 klass_message)
    assert_block(full_message) do
      klasses.none? {|k| object.instance_of?(k)}
    end
  end
end

#assert_not_kind_of(klass, object, message = nil) ⇒ Object Also known as: refute_kind_of

Passes if object.kind_of?(klass) does not hold. When klass is an array of classes or modules, it passes only if all classes (and modules) do not satisfy +object.kind_of?(class_or_module).

Examples:

assert_not_kind_of(Fixnum, 'foo')           # -> pass
assert_not_kind_of([Fixnum, NilClass], '0') # -> pass
assert_not_kind_of([Fixnum, NilClass], 100) # -> fail

Since:

  • 3.0.0


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# File 'lib/test/unit/assertions.rb', line 450

def assert_not_kind_of(klass, object, message=nil)
  _wrap_assertion do
    if klass.is_a?(Array)
      klasses = klass
    else
      klasses = [klass]
    end
    assert_block("The first parameter to assert_not_kind_of should be " +
                 "a kind_of Module or an Array of a kind_of Module.") do
      klasses.all? {|k| k.kind_of?(Module)}
    end
    klass_message = AssertionMessage.maybe_container(klass) do |value|
      "<#{value}>"
    end
    full_message = build_message(message,
                                 "<?> was expected to not be kind_of\\?\n" +
                                 "? but was.",
                                 object,
                                 klass_message)
    assert_block(full_message) do
      klasses.none? {|k| object.kind_of?(k)}
    end
  end
end

#assert_not_match(pattern, string, message = nil) ⇒ Object Also known as: refute_match

Passes if regexp !~ string

Examples:

assert_not_match(/two/, 'one 2 three')   # -> pass
assert_not_match(/three/, 'one 2 three') # -> fail

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# File 'lib/test/unit/assertions.rb', line 709

def assert_not_match(pattern, string, message=nil)
  _wrap_assertion do
    pattern = Regexp.new(Regexp.escape(pattern)) if pattern.is_a?(String)
    full_message = build_message(message,
                                 "<?> was expected to not match\n<?>.",
                                 pattern, string)
    assert_block(full_message) { pattern !~ string }
  end
end

#assert_not_nil(object, message = nil) ⇒ Object Also known as: refute_nil

Passes if ! object .nil?

Examples:

assert_not_nil '1 two 3'.sub!(/two/, '2')

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# File 'lib/test/unit/assertions.rb', line 691

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

#assert_not_operator(object1, operator, object2, message = nil) ⇒ Object Also known as: refute_operator

Compares the object1 with object2 using operator.

Passes if object1.send(operator, object2) is not true.

Examples:

assert_not_operator(5, :<, 4) # => pass
assert_not_operator(5, :>, 4) # => fail

Since:

  • 3.0.0


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# File 'lib/test/unit/assertions.rb', line 592

def assert_not_operator(object1, operator, object2, message=nil)
  _wrap_assertion do
    full_message = build_message(nil, "<?>\ngiven as the operator for #assert_not_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)
<?> was expected to not be
?
<?>.
EOT
    assert_block(full_message) { ! object1.__send__(operator, object2) }
  end
end

#assert_not_predicate(object, predicate, message = nil) ⇒ Object Also known as: refute_predicate

Passes if object.predicate is not true.

Examples:

assert_not_predicate([1], :empty?) # -> pass
assert_not_predicate([], :empty?)  # -> fail

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# File 'lib/test/unit/assertions.rb', line 1400

def assert_not_predicate(object, predicate, message=nil)
  _wrap_assertion do
    assert_respond_to(object, predicate, message)
    actual = object.__send__(predicate)
    full_message = build_message(message,
                                 "<?>.? is false value expected but was\n" +
                                 "<?>",
                                 object,
                                 AssertionMessage.literal(predicate),
                                 actual)
    assert_block(full_message) do
      not actual
    end
  end
end

#assert_not_respond_to(object, method, message = nil) ⇒ Object Also known as: refute_respond_to

Passes if object does not .respond_to? method.

Examples:

assert_not_respond_to('bugbear', :nonexistence) # -> pass
assert_not_respond_to('bugbear', :size)         # -> fail

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# File 'lib/test/unit/assertions.rb', line 508

def assert_not_respond_to(object, method, message=nil)
  _wrap_assertion do
    full_message = build_message(message,
                                 "<?>.kind_of\\?(Symbol) or\n" +
                                 "<?>.respond_to\\?(:to_str) expected",
                                 method, method)
    assert_block(full_message) do
      method.kind_of?(Symbol) or method.respond_to?(:to_str)
    end
    full_message = build_message(message,
                                 "!<?>.respond_to\\?(?) expected\n" +
                                 "(Class: <?>)",
                                 object, method, object.class)
    assert_block(full_message) {!object.respond_to?(method)}
  end
end

#assert_not_same(expected, actual, message = nil) ⇒ Object Also known as: refute_same

Passes if ! actual .equal? expected

Examples:

assert_not_same Object.new, Object.new

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# File 'lib/test/unit/assertions.rb', line 654

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

#assert_not_send(send_array, message = nil) ⇒ Object

Passes if the method send doesn't return a true value.

send_array is composed of:

  • A receiver
  • A method
  • Arguments to the method

Examples:

assert_not_send([[1, 2], :member?, 1]) # -> fail
assert_not_send([[1, 2], :member?, 4]) # -> pass

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# File 'lib/test/unit/assertions.rb', line 1165

def assert_not_send(send_array, message=nil)
  _wrap_assertion do
    assert_instance_of(Array, send_array,
                       "assert_not_send requires an array " +
                       "of send information")
    assert_operator(send_array.size, :>=, 2,
                    "assert_not_send requires at least a receiver " +
                    "and a message name")
    format = <<EOT
<?> was expected to respond to
<?(*?)> with not a true value but was
<?>.
EOT
    receiver, message_name, *arguments = send_array
    result = nil
    full_message =
      build_message(message,
                    format,
                    receiver,
                    AssertionMessage.literal(message_name.to_s),
                    arguments,
                    AssertionMessage.delayed_literal {result})
    assert_block(full_message) do
      result = receiver.__send__(message_name, *arguments)
      not result
    end
  end
end

#assert_nothing_raised(*args) ⇒ Object

Passes if block does not raise an exception.

Examples:

assert_nothing_raised do
  [1, 2].uniq
end

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# File 'lib/test/unit/assertions.rb', line 617

def assert_nothing_raised(*args)
  _wrap_assertion do
    if args.last.is_a?(String)
      message = args.pop
    else
      message = ""
    end

    assert_exception_helper = AssertExceptionHelper.new(self, args)
    begin
      yield
    rescue Exception => e
      if ((args.empty? && !e.instance_of?(AssertionFailedError)) ||
          assert_exception_helper.expected?(e))
        failure_message = build_message(message, "Exception raised:\n?", e)
        assert_block(failure_message) {false}
      else
        raise
      end
    end
  end
end

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

Passes if block does not throw anything.

Examples:

assert_nothing_thrown do
  [1, 2].uniq
end

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# File 'lib/test/unit/assertions.rb', line 837

def assert_nothing_thrown(message=nil, &proc)
  _wrap_assertion do
    assert(block_given?, "Should have passed a block to assert_nothing_thrown")
    begin
      proc.call
    rescue => error
      extractor = ThrowTagExtractor.new(error)
      tag = extractor.extract_tag
      raise if tag.nil?
      full_message = build_message(message,
                                   "<?> was thrown when nothing was expected",
                                   tag)
      flunk(full_message)
    end
    assert(true, "Expected nothing to be thrown")
  end
end

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

Compares the object1 with object2 using operator.

Passes if object1.send(operator, object2) is true.

Examples:

assert_operator 5, :>=, 4

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# File 'lib/test/unit/assertions.rb', line 569

def assert_operator(object1, operator, object2, message=nil)
  _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)
<?> was expected to be
?
<?>.
EOT
    assert_block(full_message) { object1.__send__(operator, object2) }
  end
end

#assert_path_exist(path, message = nil) ⇒ Object

Passes if path exists.

Examples:

assert_path_exist("/tmp")          # -> pass
assert_path_exist("/bin/sh")       # -> pass
assert_path_exist("/nonexistent")  # -> fail

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# File 'lib/test/unit/assertions.rb', line 1476

def assert_path_exist(path, message=nil)
  _wrap_assertion do
    failure_message = build_message(message,
                                    "<?> was expected to exist",
                                    path)
    assert_block(failure_message) do
      File.exist?(path)
    end
  end
end

#assert_path_not_exist(path, message = nil) ⇒ Object

Passes if path doesn't exist.

Examples:

assert_path_not_exist("/nonexistent")  # -> pass
assert_path_not_exist("/tmp")          # -> fail
assert_path_not_exist("/bin/sh")       # -> fail

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# File 'lib/test/unit/assertions.rb', line 1494

def assert_path_not_exist(path, message=nil)
  _wrap_assertion do
    failure_message = build_message(message,
                                    "<?> was expected to not exist",
                                    path)
    assert_block(failure_message) do
      not File.exist?(path)
    end
  end
end

#assert_predicate(object, predicate, message = nil) ⇒ Object

Passes if object.predicate is true.

Examples:

assert_predicate([], :empty?)  # -> pass
assert_predicate([1], :empty?) # -> fail

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# File 'lib/test/unit/assertions.rb', line 1378

def assert_predicate(object, predicate, message=nil)
  _wrap_assertion do
    assert_respond_to(object, predicate, message)
    actual = object.__send__(predicate)
    full_message = build_message(message,
                                 "<?>.? is true value expected but was\n" +
                                 "<?>",
                                 object,
                                 AssertionMessage.literal(predicate),
                                 actual)
    assert_block(full_message) do
      actual
    end
  end
end

#assert_raise(*args, &block) ⇒ Object Also known as: assert_raises

Passes if the block raises one of the expected exceptions. When an expected exception is an Exception object, passes if expected_exception == actual_exception.

Examples:

assert_raise(RuntimeError, LoadError) do
  raise 'Boom!!!'
end # -> pass

assert_raise do
  raise Exception, 'Any exception should be raised!!!'
end # -> pass

assert_raise(RuntimeError.new("XXX")) {raise "XXX"} # -> pass
assert_raise(MyError.new("XXX"))      {raise "XXX"} # -> fail
assert_raise(RuntimeError.new("ZZZ")) {raise "XXX"} # -> fail

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# File 'lib/test/unit/assertions.rb', line 268

def assert_raise(*args, &block)
  assert_expected_exception = Proc.new do |*_args|
    message, assert_exception_helper, actual_exception = _args
    expected = assert_exception_helper.expected_exceptions
    diff = AssertionMessage.delayed_diff(expected, actual_exception)
    full_message = build_message(message,
                                 "<?> exception expected but was\n<?>.?",
                                 expected, actual_exception, diff)
    begin
      assert_block(full_message) do
        expected == [] or
          assert_exception_helper.expected?(actual_exception)
      end
    rescue AssertionFailedError => failure
      _set_failed_information(failure, expected, actual_exception)
      raise failure # For JRuby. :<
    end
  end
  _assert_raise(assert_expected_exception, *args, &block)
end

#assert_raise_kind_of(*args, &block) ⇒ Object

Passes if the block raises one of the given exceptions or sub exceptions of the given exceptions.

Examples:

assert_raise_kind_of(SystemCallError) do
  raise Errno::EACCES
end

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# File 'lib/test/unit/assertions.rb', line 300

def assert_raise_kind_of(*args, &block)
  assert_expected_exception = Proc.new do |*_args|
    message, assert_exception_helper, actual_exception = _args
    expected = assert_exception_helper.expected_exceptions
    full_message = build_message(message,
                                 "<?> family exception expected " +
                                 "but was\n<?>.",
                                 expected, actual_exception)
    assert_block(full_message) do
      assert_exception_helper.expected?(actual_exception, :kind_of?)
    end
  end
  _assert_raise(assert_expected_exception, *args, &block)
end

#assert_raise_message(expected, message = nil) ⇒ Object

Passes if an exception is raised in block and its message is expected.

Examples:

assert_raise_message("exception") {raise "exception"}  # -> pass
assert_raise_message(/exc/i) {raise "exception"}       # -> pass
assert_raise_message("exception") {raise "EXCEPTION"}  # -> fail
assert_raise_message("exception") {}                   # -> fail

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# File 'lib/test/unit/assertions.rb', line 1306

def assert_raise_message(expected, message=nil)
  _wrap_assertion do
    full_message = build_message(message,
                                 "<?> exception message was expected " +
                                 "but none was thrown.",
                                 expected)
    exception = nil
    assert_block(full_message) do
      begin
        yield
        false
      rescue Exception => exception
        true
      end
    end

    actual = exception.message
    diff = AssertionMessage.delayed_diff(expected, actual)
    full_message =
      build_message(message,
                    "<?> exception message expected but was\n" +
                    "<?>.?", expected, actual, diff)
    assert_block(full_message) do
      if expected.is_a?(Regexp)
        expected =~ actual
      else
        expected == actual
      end
    end
  end
end

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

Passes if object .respond_to? method

Examples:

assert_respond_to 'bugbear', :slice

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# File 'lib/test/unit/assertions.rb', line 485

def assert_respond_to(object, method, message=nil)
  _wrap_assertion do
    full_message = build_message(message,
                                 "<?>.kind_of\\?(Symbol) or\n" +
                                 "<?>.respond_to\\?(:to_str) expected",
                                 method, method)
    assert_block(full_message) do
      method.kind_of?(Symbol) or method.respond_to?(:to_str)
    end
    full_message = build_message(message,
                                 "<?>.respond_to\\?(?) expected\n" +
                                 "(Class: <?>)",
                                 object, method, object.class)
    assert_block(full_message) {object.respond_to?(method)}
  end
end

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

Passes if actual .equal? expected (i.e. they are the same instance).

Examples:

o = Object.new
assert_same o, o

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# File 'lib/test/unit/assertions.rb', line 552

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

#assert_send(send_array, message = nil) ⇒ Object

Passes if the method send returns a true value.

send_array is composed of:

  • A receiver
  • A method
  • Arguments to the method

Examples:

assert_send([[1, 2], :member?, 1]) # -> pass
assert_send([[1, 2], :member?, 4]) # -> fail

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# File 'lib/test/unit/assertions.rb', line 1125

def assert_send(send_array, message=nil)
  _wrap_assertion do
    assert_instance_of(Array, send_array,
                       "assert_send requires an array " +
                       "of send information")
    assert_operator(send_array.size, :>=, 2,
                    "assert_send requires at least a receiver " +
                    "and a message name")
    format = <<EOT
<?> was expected to respond to
<?(*?)> with a true value but was
<?>.
EOT
    receiver, message_name, *arguments = send_array
    result = nil
    full_message =
      build_message(message,
                    format,
                    receiver,
                    AssertionMessage.literal(message_name.to_s),
                    arguments,
                    AssertionMessage.delayed_literal {result})
    assert_block(full_message) do
      result = receiver.__send__(message_name, *arguments)
      result
    end
  end
end

#assert_throw(expected_object, message = nil, &proc) ⇒ Object Also known as: assert_throws

Passes if the block throws expected_object

Examples:

assert_throw(:done) do
  throw(:done)
end

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# File 'lib/test/unit/assertions.rb', line 791

def assert_throw(expected_object, message=nil, &proc)
  _wrap_assertion do
    begin
      catch([]) {}
    rescue TypeError
      assert_instance_of(Symbol, expected_object,
                         "assert_throws expects the symbol that should be thrown for its first argument")
    end
    assert_block("Should have passed a block to assert_throw.") do
      block_given?
    end
    caught = true
    begin
      catch(expected_object) do
        proc.call
        caught = false
      end
      full_message = build_message(message,
                                   "<?> should have been thrown.",
                                   expected_object)
      assert_block(full_message) {caught}
    rescue => error
      extractor = ThrowTagExtractor.new(error)
      tag = extractor.extract_tag
      raise if tag.nil?
      full_message = build_message(message,
                                   "<?> was expected to be thrown but\n" +
                                   "<?> was thrown.",
                                   expected_object, tag)
      flunk(full_message)
    end
  end
end

#assert_true(actual, message = nil) ⇒ Object

Passes if actual is true.

Examples:

assert_true(true)  # -> pass
assert_true(:true) # -> fail

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# File 'lib/test/unit/assertions.rb', line 1216

def assert_true(actual, message=nil)
  _wrap_assertion do
    assert_block(build_message(message,
                               "<true> expected but was\n<?>",
                               actual)) do
      actual == true
    end
  end
end

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

Builds a failure message. user_message is added before the template and arguments replaces the '?'s positionally in the template.


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# File 'lib/test/unit/assertions.rb', line 1619

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

#flunk(message = "Flunked") ⇒ Object

Flunk always fails.

Examples:

flunk 'Not done testing yet.'

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# File 'lib/test/unit/assertions.rb', line 645

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

#refute(object, message = nil) ⇒ void

Note:

Just for minitest compatibility. :<

This method returns an undefined value.

Asserts that object is false or nil.

Examples:

Pass patterns

refute(false)    # => pass
refute(nil)      # => pass

Failure patterns

refute(true)     # => failure
refute("string") # => failure

Parameters:

  • object (Object)

    The object to be asserted.

Since:

  • 2.5.3


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# File 'lib/test/unit/assertions.rb', line 190

def refute(object, message=nil)
  _wrap_assertion do
    assertion_message = nil
    case message
    when nil, String, Proc
    when AssertionMessage
      assertion_message = message
    else
      error_message = "assertion message must be String, Proc or "
      error_message += "#{AssertionMessage}: "
      error_message += "<#{message.inspect}>(<#{message.class}>)"
      raise ArgumentError, error_message, filter_backtrace(caller)
    end
    assert_block("refute should not be called with a block.") do
      !block_given?
    end
    assertion_message ||= build_message(message,
                                        "<?> is neither nil or false.",
                                        object)
    assert_block(assertion_message) do
      not object
    end
  end
end