Class: RSpec::CollectionMatchers::Have
- Inherits:
-
Object
- Object
- RSpec::CollectionMatchers::Have
show all
- Defined in:
- lib/rspec/collection_matchers/have.rb
Constant Summary
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- QUERY_METHODS =
[:size, :length, :count].freeze
- IGNORED_CLASSES =
[Integer].freeze
Instance Method Summary
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Constructor Details
#initialize(expected, relativity = :exactly) ⇒ Have
Returns a new instance of Have.
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# File 'lib/rspec/collection_matchers/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
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Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(method, *args, &block) ⇒ Object
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# File 'lib/rspec/collection_matchers/have.rb', line 112
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
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Instance Method Details
#description ⇒ Object
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# File 'lib/rspec/collection_matchers/have.rb', line 101
def description
return errors_on_message(:have) if is_errors_on?
"have #{relative_expectation} #{@collection_name}"
end
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#determine_collection(collection_or_owner) ⇒ Object
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# File 'lib/rspec/collection_matchers/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
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#determine_query_method(collection) ⇒ Object
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# File 'lib/rspec/collection_matchers/have.rb', line 60
def determine_query_method(collection)
QUERY_METHODS.detect {|m| collection.respond_to?(m)}
end
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#failure_message ⇒ Object
Also known as:
failure_message_for_should
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# File 'lib/rspec/collection_matchers/have.rb', line 72
def failure_message
return errors_on_message(:expected, ", got #{@actual}") if is_errors_on?
"expected #{relative_expectation} #{@collection_name}, got #{@actual}"
end
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#failure_message_when_negated ⇒ Object
Also known as:
failure_message_for_should_not
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# File 'lib/rspec/collection_matchers/have.rb', line 78
def failure_message_when_negated
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:
#{Syntax.negative_expression("actual", "have_at_most(#{@expected}).#{@collection_name}")}
We recommend that you use this instead:
#{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:
#{Syntax.negative_expression("actual", "have_at_least(#{@expected}).#{@collection_name}")}
We recommend that you use this instead:
#{Syntax.positive_expression("actual", "have_at_most(#{@expected - 1}).#{@collection_name}")}
EOF
end
end
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#is_ignored_class?(collection) ⇒ Boolean
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# File 'lib/rspec/collection_matchers/have.rb', line 64
def is_ignored_class?(collection)
IGNORED_CLASSES.any? {|klass| klass === collection}
end
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#matches?(collection_or_owner) ⇒ Boolean
Also known as:
==
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# File 'lib/rspec/collection_matchers/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 if !query_method || is_ignored_class?(collection)
@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
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#not_a_collection ⇒ Object
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# File 'lib/rspec/collection_matchers/have.rb', line 68
def not_a_collection
"expected #{@collection_name} to be a collection but it does not respond to #length, #size or #count"
end
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#relativities ⇒ Object
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# File 'lib/rspec/collection_matchers/have.rb', line 17
def relativities
@relativities ||= {
:exactly => "",
:at_least => "at least ",
:at_most => "at most "
}
end
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#respond_to?(m) ⇒ Boolean
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# File 'lib/rspec/collection_matchers/have.rb', line 106
def respond_to?(m)
@expected.respond_to?(m) || super
end
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