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Contents
require 'spec_helper'
def count_occurences(str, find)
count = 0
loop do
index = str.index(find)
break unless index
count += 1
str = str[index+1..-1]
end
count
end
describe Promise do
it 'should allow you to call methods that will be called on the resolved value and return a new promise' do
a = Promise.new.resolve(5)
float_promise = a.to_f
expect(float_promise.class).to eq(Promise)
float_promise.then do |val|
expect(val).to eq(5)
end
end
it 'should patch inspect on Promise so that nested Promise are shown as a single promise' do
a = Promise.new
b = Promise.new.then { a }
a.resolve(1)
b.resolve(2)
# There is currently an infinity loop in scan in opal.
# https://github.com/opal/opal/issues/457
# TODO: Remove when opal 0.8 comes out.
# expect(b.inspect.scan('Promise').size).to eq(1)
expect(count_occurences(b.inspect, 'Promise')).to eq(1)
end
it 'should not respond to comparitors' do
[:>, :<].each do |comp|
a = Promise.new
expect do
a.send(comp, 5)
end.to raise_error(NoMethodError)
end
end
it 'should proxy methods on promises' do
a = Promise.new
expect do
a.something
end.not_to raise_error
end
describe "unwrap" do
it 'should raise an exception if calling unwrap on an unrealized promise' do
a = Promise.new
expect do
a.unwrap
end.to raise_error(Promise::UnrealizedPromiseException, '#unwrap called on a promise that has yet to be realized.')
end
it 'should return the value for a resolved promise' do
a = Promise.value(5)
expect(a.unwrap).to eq(5)
end
it 'should raise an error from a rejected promise' do
a = Promise.error(Exception.new('broke it'))
expect do
a.unwrap
end.to raise_error(Exception, 'broke it')
end
end
end
Version data entries
24 entries across 24 versions & 1 rubygems