Class: RSpec::Matchers::BuiltIn::Have

Inherits:
Object
  • Object
show all
Defined in:
lib/rspec/matchers/built_in/have.rb

Constant Summary

QUERY_METHODS = 
[:size, :length, :count].freeze

Instance Method Summary (collapse)

Constructor Details

- (Have) initialize(expected, relativity = :exactly)

A new instance of Have

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# File 'lib/rspec/matchers/built_in/have.rb', line 7
def initialize(expected, relativity=:exactly)
  @expected = case expected
              when :no then 0
              when String then expected.to_i
              else expected
              end
  @relativity = relativity
  @actual = @collection_name = @plural_collection_name = nil
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

- (Object) method_missing(method, *args) (private) 

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# File 'lib/rspec/matchers/built_in/have.rb', line 104
def method_missing(method, *args, &block)
  @collection_name = method
  if inflector = (defined?(ActiveSupport::Inflector) && ActiveSupport::Inflector.respond_to?(:pluralize) ? ActiveSupport::Inflector : (defined?(Inflector) ? Inflector : nil))
    @plural_collection_name = inflector.pluralize(method.to_s)
  end
  @args = args
  @block = block
  self
end

Instance Method Details

- (Object) description 

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# File 'lib/rspec/matchers/built_in/have.rb', line 94
def description
  "have #{relative_expectation} #{@collection_name}"
end

- (Object) determine_collection(collection_or_owner) 

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# File 'lib/rspec/matchers/built_in/have.rb', line 48
def determine_collection(collection_or_owner)
  if collection_or_owner.respond_to?(@collection_name)
    collection_or_owner.__send__(@collection_name, *@args, &@block)
  elsif (@plural_collection_name && collection_or_owner.respond_to?(@plural_collection_name))
    collection_or_owner.__send__(@plural_collection_name, *@args, &@block)
  elsif determine_query_method(collection_or_owner)
    collection_or_owner
  else
    collection_or_owner.__send__(@collection_name, *@args, &@block)
  end
end

- (Object) determine_query_method(collection) 

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# File 'lib/rspec/matchers/built_in/have.rb', line 60
def determine_query_method(collection)
  QUERY_METHODS.detect {|m| collection.respond_to?(m)}
end

- (Object) failure_message_for_should 

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# File 'lib/rspec/matchers/built_in/have.rb', line 68
def failure_message_for_should
  "expected #{relative_expectation} #{@collection_name}, got #{@actual}"
end

- (Object) failure_message_for_should_not 

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# File 'lib/rspec/matchers/built_in/have.rb', line 72
def failure_message_for_should_not
  if @relativity == :exactly
    return "expected target not to have #{@expected} #{@collection_name}, got #{@actual}"
  elsif @relativity == :at_most
    return <<-EOF
Isn't life confusing enough?
Instead of having to figure out the meaning of this:
  #{Expectations::Syntax.negative_expression("actual", "have_at_most(#{@expected}).#{@collection_name}")}
We recommend that you use this instead:
  #{Expectations::Syntax.positive_expression("actual", "have_at_least(#{@expected + 1}).#{@collection_name}")}
EOF
  elsif @relativity == :at_least
    return <<-EOF
Isn't life confusing enough?
Instead of having to figure out the meaning of this:
  #{Expectations::Syntax.negative_expression("actual", "have_at_least(#{@expected}).#{@collection_name}")}
We recommend that you use this instead:
  #{Expectations::Syntax.positive_expression("actual", "have_at_most(#{@expected - 1}).#{@collection_name}")}
EOF
  end
end

- (Boolean) matches?(collection_or_owner) Also known as: ==

Returns:

  • (Boolean) 
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# File 'lib/rspec/matchers/built_in/have.rb', line 25
def matches?(collection_or_owner)
  collection = determine_collection(collection_or_owner)
  case collection
  when enumerator_class
    for query_method in QUERY_METHODS
      next unless collection.respond_to?(query_method)
      @actual = collection.__send__(query_method)
      break unless @actual.nil?
    end
    raise not_a_collection if @actual.nil?
  else
    query_method = determine_query_method(collection)
    raise not_a_collection unless query_method
    @actual = collection.__send__(query_method)
  end
  case @relativity
  when :at_least then @actual >= @expected
  when :at_most  then @actual <= @expected
  else                @actual == @expected
  end
end

- (Object) not_a_collection 

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# File 'lib/rspec/matchers/built_in/have.rb', line 64
def not_a_collection
  "expected #{@collection_name} to be a collection but it does not respond to #length, #size or #count"
end

- (Object) relativities 

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# File 'lib/rspec/matchers/built_in/have.rb', line 17
def relativities
  @relativities ||= {
    :exactly => "",
    :at_least => "at least ",
    :at_most => "at most "
  }
end

- (Boolean) respond_to?(m)

Returns:

  • (Boolean) 
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# File 'lib/rspec/matchers/built_in/have.rb', line 98
def respond_to?(m)
  @expected.respond_to?(m) || super
end