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@kristjan
Created May 22, 2010 01:16
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Some rspec macros to verify Rails model validations
# Require fields.
it_should_require :wish, :author, :title, :body, :signature
# Validate string lengths
it_should_validate_strings :body => 1024, :title => 255, :signature => 25
# Strings can be absent. Default length is 255, like Rails.
it_should_validate_strings :story => 10000,
:blurb => {:optional => true},
:tagline => {:optional => true}
# Optional with a non-default length.
it_should_validate_strings :note => {:length => 1024, :optional => true}
# Specify a specific Fixjour builder.
use_builder :video_attachment # => new_video_attachment
module Spec::Example::ExampleGroupMethods
def use_builder(builder) # Using Fixjour
module_eval <<-BUILDER
def object_builder
#{builder.inspect}
end
BUILDER
end
def it_should_require(*fields)
@required_fields = fields
instance_eval <<-REQUIREMENTS
it_should_behave_like "things with required fields"
REQUIREMENTS
end
def it_should_validate_strings(string_lengths)
@string_lengths_to_validate = string_lengths
instance_eval <<-REQUIREMENTS
it_should_behave_like "things with strings"
REQUIREMENTS
end
end
shared_examples_for "object builders" do
def new_object(*args)
builder_name = described_class.name.underscore
builder_name = object_builder if respond_to?(:object_builder)
send("new_#{builder_name}", *args)
end
end
shared_examples_for "things with required fields" do
it_should_behave_like "object builders"
@required_fields.each do |field|
it "must have a(n) #{field}" do
new_object(field => nil).should_not be_valid
end
end
end
shared_examples_for "things with strings" do
it_should_behave_like "object builders"
@string_lengths_to_validate.each do |field, options|
if options.is_a?(Fixnum)
max_length = options
else
max_length = options.fetch(:length, 255)
allow_blank = options.fetch(:optional, false)
end
unless allow_blank
it "can't have an empty #{field}" do
new_object(field => '').should_not be_valid
end
end
it "can't have a loooooong #{field}" do
new_object(field => 'a'*(max_length+1)).should_not be_valid
end
[1, rand(max_length)+1, max_length].each do |length|
it "can have a reasonably sized #{field}" do
new_object(field => 'a'*length).should be_valid
end
end
end
end
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