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Module: ActiveSupport::Testing::Assertions

Constant Summary

Instance Method Summary

Instance Method Details

#_assert_nothing_raised_or_warn(assertion, &block) (private)

[ GitHub ] 

  


# File 'activesupport/lib/active_support/testing/assertions.rb', line 286



def _assert_nothing_raised_or_warn(assertion, &block)
  assert_nothing_raised(&block)
rescue Minitest::UnexpectedError => e
  if tagged_logger && tagged_logger.warn?
    warning = <<~MSG
      #{self.class} - #{name}: #{e.error.class} raised.
      If you expected this exception, use `assert_raises` as near to the code that raises as possible.
      Other block based assertions (e.g. `#{assertion}`) can be used, as long as `assert_raises` is inside their block.
    MSG
    tagged_logger.warn warning
  end

  raise
end


  








  

    #_callable_to_source_string(callable)   (private)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/testing/assertions.rb', line 301



def _callable_to_source_string(callable)
  if defined?(RubyVM::InstructionSequence) && callable.is_a?(Proc)
    iseq = RubyVM::InstructionSequence.of(callable)
    source =
      if iseq.script_lines
        iseq.script_lines.join("\n")
      elsif File.readable?(iseq.absolute_path)
        File.read(iseq.absolute_path)
      end

    return callable unless source

    location = iseq.to_a[4][:code_location]
    return callable unless location

    lines = source.lines[(location[0] - 1)..(location[2] - 1)]
    lines[-1] = lines[-1].byteslice(...location[3])
    lines[0] = lines[0].byteslice(location[1]...)
    source = lines.join.strip

    # We ignore procs defined with do/end as they are likely multi-line anyway.
    if source.start_with?("{")
      source.delete_suffix!("}")
      source.delete_prefix!("{")
      source.strip!
      # It won't read nice if the callable contains multiple
      # lines, and it should be a rare occurrence anyway.
      # Same if it takes arguments.
      if !source.include?("\n") && !source.start_with?("|")
        return source
      end
    end
  end

  callable
end


  








  

    #assert_changes(expression, message = nil, from: UNTRACKED, to: UNTRACKED, &block)  
  



  

    

Assertion that the result of evaluating an expression is changed before and after invoking the passed in block.



assert_changes 'Status.all_good?' do
  post :create, params: { status: { ok: false } }
end



You can pass the block as a string to be evaluated in the context of the block. A lambda can be passed for the block as well.



assert_changes -> { Status.all_good? } do
  post :create, params: { status: { ok: false } }
end



The assertion is useful to test side effects. The passed block can be anything that can be converted to string with #to_s.



assert_changes :@object do
  @object = 42
end



The keyword arguments :from and :to can be given to specify the expected initial value and the expected value after the block was executed.



assert_changes :@object, from: nil, to: :foo do
  @object = :foo
end



An error message can be specified.



assert_changes -> { Status.all_good? }, 'Expected the status to be bad' do
  post :create, params: { status: { incident: true } }
end


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/testing/assertions.rb', line 195



def assert_changes(expression, message = nil, from: UNTRACKED, to: UNTRACKED, &block)
  exp = expression.respond_to?(:call) ? expression : -> { eval(expression.to_s, block.binding) }

  before = exp.call
  retval = _assert_nothing_raised_or_warn("assert_changes", &block)

  unless from == UNTRACKED
    rich_message = -> do
      error = "Expected change from #{from.inspect}, got #{before.inspect}"
      error = "#{message}.\n#{error}" if message
      error
    end
    assert from === before, rich_message
  end

  after = exp.call

  rich_message = -> do
    code_string = expression.respond_to?(:call) ? _callable_to_source_string(expression) : expression
    error = "`#{code_string}` didn't change"
    error = "#{error}. It was already #{to.inspect}" if before == to
    error = "#{message}.\n#{error}" if message
    error
  end
  refute_equal before, after, rich_message

  unless to == UNTRACKED
    rich_message = -> do
      error = "Expected change to #{to.inspect}, got #{after.inspect}\n"
      error = "#{message}.\n#{error}" if message
      error
    end
    assert to === after, rich_message
  end

  retval
end


  








  

    #assert_difference(expression, *args, &block)  
  



  

    

Test numeric difference between the return value of an expression as a result of what is evaluated in the yielded block.



assert_difference 'Article.count' do
  post :create, params: { article: {...} }
end



An arbitrary expression is passed in and evaluated.



assert_difference 'Article.last.comments(:reload).size' do
  post :create, params: { comment: {...} }
end



An arbitrary positive or negative difference can be specified. The default is 1.



assert_difference 'Article.count', -1 do
  post :delete, params: { id: ... }
end



An array of expressions can also be passed in and evaluated.



assert_difference [ 'Article.count', 'Post.count' ], 2 do
  post :create, params: { article: {...} }
end



A hash of expressions/numeric differences can also be passed in and evaluated.



assert_difference ->{ Article.count } => 1, ->{ Notification.count } => 2 do
  post :create, params: { article: {...} }
end



A lambda or a list of lambdas can be passed in and evaluated:



assert_difference ->{ Article.count }, 2 do
  post :create, params: { article: {...} }
end

assert_difference [->{ Article.count }, ->{ Post.count }], 2 do
  post :create, params: { article: {...} }
end



An error message can be specified.



assert_difference 'Article.count', -1, 'An Article should be destroyed' do
  post :delete, params: { id: ... }
end


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/testing/assertions.rb', line 101



def assert_difference(expression, *args, &block)
  expressions =
    if expression.is_a?(Hash)
      message = args[0]
      expression
    else
      difference = args[0] || 1
      message = args[1]
      Array(expression).index_with(difference)
    end

  exps = expressions.keys.map { |e|
    e.respond_to?(:call) ? e : lambda { eval(e, block.binding) }
  }
  before = exps.map(&:call)

  retval = _assert_nothing_raised_or_warn("assert_difference", &block)

  expressions.zip(exps, before) do |(code, diff), exp, before_value|
    actual = exp.call
    rich_message = -> do
      code_string = code.respond_to?(:call) ? _callable_to_source_string(code) : code
      error = "`#{code_string}` didn't change by #{diff}, but by #{actual - before_value}"
      error = "#{message}.\n#{error}" if message
      error
    end
    assert_equal(before_value + diff, actual, rich_message)
  end

  retval
end


  








  

    #assert_no_changes(expression, message = nil, from: UNTRACKED, &block)  
  



  

    

Assertion that the result of evaluating an expression is not changed before and after invoking the passed in block.



assert_no_changes 'Status.all_good?' do
  post :create, params: { status: { ok: true } }
end



Provide the optional keyword argument :from to specify the expected initial value.



assert_no_changes -> { Status.all_good? }, from: true do
  post :create, params: { status: { ok: true } }
end



An error message can be specified.



assert_no_changes -> { Status.all_good? }, 'Expected the status to be good' do
  post :create, params: { status: { ok: false } }
end


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/testing/assertions.rb', line 252



def assert_no_changes(expression, message = nil, from: UNTRACKED, &block)
  exp = expression.respond_to?(:call) ? expression : -> { eval(expression.to_s, block.binding) }

  before = exp.call
  retval = _assert_nothing_raised_or_warn("assert_no_changes", &block)

  unless from == UNTRACKED
    rich_message = -> do
      error = "Expected initial value of #{from.inspect}, got #{before.inspect}"
      error = "#{message}.\n#{error}" if message
      error
    end
    assert from === before, rich_message
  end

  after = exp.call

  rich_message = -> do
    code_string = expression.respond_to?(:call) ? _callable_to_source_string(expression) : expression
    error = "`#{code_string}` changed"
    error = "#{message}.\n#{error}" if message
    error
  end

  if before.nil?
    assert_nil after, rich_message
  else
    assert_equal before, after, rich_message
  end

  retval
end


  








  

    #assert_no_difference(expression, message = nil, &block)  
  



  

    

Assertion that the numeric result of evaluating an expression is not changed before and after invoking the passed in block.



assert_no_difference 'Article.count' do
  post :create, params: { article: invalid_attributes }
end



A lambda can be passed in and evaluated.



assert_no_difference -> { Article.count } do
  post :create, params: { article: invalid_attributes }
end



An error message can be specified.



assert_no_difference 'Article.count', 'An Article should not be created' do
  post :create, params: { article: invalid_attributes }
end



An array of expressions can also be passed in and evaluated.



assert_no_difference [ 'Article.count', -> { Post.count } ] do
  post :create, params: { article: invalid_attributes }
end


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/testing/assertions.rb', line 157



def assert_no_difference(expression, message = nil, &block)
  assert_difference expression, 0, message, &block
end


  








  

    #assert_not(object, message = nil)  
  



  

    

Asserts that an expression is not truthy. Passes if object is nil or false. “Truthy” means “considered true in a conditional” like if foo.



assert_not nil    # => true
assert_not false  # => true
assert_not 'foo'  # => Expected "foo" to be nil or false



An error message can be specified.



assert_not foo, 'foo should be false'


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/testing/assertions.rb', line 21



def assert_not(object, message = nil)
  message ||= -> { "Expected #{mu_pp(object)} to be nil or false" }
  assert !object, message
end


  








  

    #assert_nothing_raised  
  



  

    

Assertion that the block should not raise an exception.



Passes if evaluated code in the yielded block raises no exception.



assert_nothing_raised do
  perform_service(param: 'no_exception')
end


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/testing/assertions.rb', line 48



def assert_nothing_raised
  yield.tap { assert(true) }
rescue => error
  raise Minitest::UnexpectedError.new(error)
end


  








  

    #assert_raise(*exp, match: nil, &block)  
  



  

    

Alias for #assert_raises.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/testing/assertions.rb', line 39



alias :assert_raise :assert_raises


  








  

    #assert_raises(*exp, match: nil, &block)  
    Also known as: #assert_raise
  



  

    

Asserts that a block raises one of exp. This is an enhancement of the standard ::Minitest assertion method with the ability to test error messages.



assert_raises(ArgumentError, match: /incorrect param/i) do
  perform_service(param: 'exception')
end


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/testing/assertions.rb', line 34



def assert_raises(*exp, match: nil, &block)
  error = super(*exp, &block)
  assert_match(match, error.message) if match
  error
end