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module RSpec
module Matchers
module BuiltIn
class Have
QUERY_METHODS = [:size, :length, :count].freeze
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
def relativities
@relativities ||= {
:exactly => "",
:at_least => "at least ",
:at_most => "at most "
}
end
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
alias == matches?
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
def determine_query_method(collection)
QUERY_METHODS.detect {|m| collection.respond_to?(m)}
end
def not_a_collection
"expected #{@collection_name} to be a collection but it does not respond to #length, #size or #count"
end
def failure_message_for_should
"expected #{relative_expectation} #{@collection_name}, got #{@actual}"
end
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
def description
"have #{relative_expectation} #{@collection_name}"
end
def respond_to?(m)
@expected.respond_to?(m) || super
end
private
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
def relative_expectation
"#{relativities[@relativity]}#{@expected}"
end
def enumerator_class
RUBY_VERSION < '1.9' ? Enumerable::Enumerator : Enumerator
end
end
end
end
end
|
