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require 'spec_helper'
require 'will_paginate/page_number'
require 'json'
describe WillPaginate::PageNumber do
describe "valid" do
def num
WillPaginate::PageNumber.new('12', 'page')
end
it "== 12" do
num.should eq(12)
end
it "inspects to 'page 12'" do
num.inspect.should eq('page 12')
end
it "is a PageNumber" do
(num.instance_of? WillPaginate::PageNumber).should be
end
it "is a kind of Numeric" do
(num.is_a? Numeric).should be
end
it "is a kind of Integer" do
(num.is_a? Integer).should be
end
it "isn't directly a Integer" do
(num.instance_of? Integer).should_not be
end
it "passes the PageNumber=== type check" do |variable|
(WillPaginate::PageNumber === num).should be
end
it "passes the Numeric=== type check" do |variable|
(Numeric === num).should be
end
it "fails the Numeric=== type check" do |variable|
(Integer === num).should_not be
end
it "serializes as JSON number" do
JSON.dump(page: num).should eq('{"page":12}')
end
end
describe "invalid" do
def create(value, name = 'page')
described_class.new(value, name)
end
it "errors out on non-int values" do
lambda { create(nil) }.should raise_error(WillPaginate::InvalidPage)
lambda { create('') }.should raise_error(WillPaginate::InvalidPage)
lambda { create('Schnitzel') }.should raise_error(WillPaginate::InvalidPage)
end
it "errors out on zero or less" do
lambda { create(0) }.should raise_error(WillPaginate::InvalidPage)
lambda { create(-1) }.should raise_error(WillPaginate::InvalidPage)
end
it "doesn't error out on zero for 'offset'" do
lambda { create(0, 'offset') }.should_not raise_error
lambda { create(-1, 'offset') }.should raise_error(WillPaginate::InvalidPage)
end
end
describe "coercion method" do
it "defaults to 'page' name" do
num = WillPaginate::PageNumber(12)
num.inspect.should eq('page 12')
end
it "accepts a custom name" do
num = WillPaginate::PageNumber(12, 'monkeys')
num.inspect.should eq('monkeys 12')
end
it "doesn't affect PageNumber instances" do
num = WillPaginate::PageNumber(12)
num2 = WillPaginate::PageNumber(num)
num2.object_id.should eq(num.object_id)
end
end
end
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