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Contents
require 'promise'
describe 'Promise#then' do
it 'calls the block when the promise has already been resolved' do
x = 42
Promise.value(23).then { |v| x = v }
x.should == 23
end
it 'calls the block when the promise is resolved' do
a = Promise.new
x = 42
a.then { |v| x = v }
a.resolve(23)
x.should == 23
end
it 'works with multiple chains' do
x = 42
Promise.value(2).then { |v| v * 2 }.then { |v| v * 4 }.then { |v| x = v }
x.should == 16
end
it 'works when a block returns a promise' do
a = Promise.new
b = Promise.new
x = 42
a.then { b }.then { |v| x = v }
a.resolve(42)
b.resolve(23)
x.should == 23
end
it 'sends raised exceptions as rejections' do
x = nil
Promise.value(2).then { raise "hue" }.rescue { |v| x = v }
x.should be_kind_of(RuntimeError)
end
it 'sends raised exceptions inside rescue blocks as next errors' do
x = nil
Promise.value(2).then { raise "hue" }.rescue { raise "omg" }.rescue { |v| x = v }
x.should be_kind_of(RuntimeError)
end
it 'allows then to be called multiple times' do
p = Promise.value(2)
x = 1
p.then { x += 1 }
p.then { x += 1 }
x.should == 3
end
it 'raises with then! if a promise has already been chained' do
p = Promise.new
p.then! {}
proc { p.then! {} }.should raise_error(ArgumentError)
end
it 'should pass a delayed falsy value' do
p = Promise.new.resolve(5).then { nil }
p.then do |value|
expect(value).to eq(nil)
end
end
end
Version data entries
49 entries across 49 versions & 1 rubygems