Maintenance of Ruby 2.0.0 ended on February 24, 2016. Read more

In Files

  • minitest/mock.rb




All mock objects are an instance of Mock

Public Instance Methods

expect(name, retval, args=[], &blk) click to toggle source

Expect that method name is called, optionally with args or a blk, and returns retval.

@mock.expect(:meaning_of_life, 42)
@mock.meaning_of_life # => 42

@mock.expect(:do_something_with, true, [some_obj, true])
@mock.do_something_with(some_obj, true) # => true

@mock.expect(:do_something_else, true) do |a1, a2|
  a1 == "buggs" && a2 == :bunny

args is compared to the expected args using case equality (ie, the '===' operator), allowing for less specific expectations.

@mock.expect(:uses_any_string, true, [String])
@mock.uses_any_string("foo") # => true
@mock.verify  # => true

@mock.expect(:uses_one_string, true, ["foo"]
@mock.uses_one_string("bar") # => true
@mock.verify  # => raises MockExpectationError
               # File minitest/mock.rb, line 57
def expect(name, retval, args=[], &blk)
  if block_given?
    raise ArgumentError, "args ignored when block given" unless args.empty?
    @expected_calls[name] << { :retval => retval, :block => blk }
    raise ArgumentError, "args must be an array" unless Array === args
    @expected_calls[name] << { :retval => retval, :args => args }
verify() click to toggle source

Verify that all methods were called as expected. Raises MockExpectationError if the mock object was not called as expected.

               # File minitest/mock.rb, line 82
def verify
  @expected_calls.each do |name, calls|
    calls.each do |expected|
      msg1 = "expected #{__call name, expected}"
      msg2 = "#{msg1}, got [#{__call name, @actual_calls[name]}]"

      raise MockExpectationError, msg2 if
        @actual_calls.has_key?(name) and
        not @actual_calls[name].include?(expected)

      raise MockExpectationError, msg1 unless
        @actual_calls.has_key?(name) and

Commenting is here to help enhance the documentation. For example, code samples, or clarification of the documentation.

If you have questions about Ruby or the documentation, please post to one of the Ruby mailing lists. You will get better, faster, help that way.

If you wish to post a correction of the docs, please do so, but also file bug report so that it can be corrected for the next release. Thank you.

If you want to help improve the Ruby documentation, please visit