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Versions: 28
Compression:
Stored size: 1.83 KB
Contents
require 'test/unit'
require 'promise/v2'
class TestPromiseThen < Test::Unit::TestCase
def test_calls_the_block_when_the_promise_has_already_been_resolved
x = 42
PromiseV2.value(23)
.then { |v| x = v }
.always { assert_equal(x, 23) }
end
def test_calls_the_block_when_the_promise_is_resolved
a = PromiseV2.new
x = 42
p = a.then { |v| x = v }
a.resolve(23)
p.always { assert_equal(x, 23) }
end
def test_works_with_multiple_chains
x = 42
PromiseV2.value(2)
.then { |v| v * 2 }
.then { |v| v * 4 }
.then { |v| x = v }
.always { assert_equal(x, 16) }
end
def test_works_when_a_block_returns_a_promise
a = PromiseV2.new
b = PromiseV2.new
x = 42
p = a.then { b }.then { |v| x = v }
a.resolve(42)
b.resolve(23)
p.always { assert_equal(x, 23) }
end
def test_sends_raised_exceptions_as_rejections
x = nil
PromiseV2.value(2)
.then { raise "hue" }
.rescue { |v| x = v }
.always { assert_equal(x.class, RuntimeError) }
end
def test_sends_raised_exceptions_inside_rescue_blocks_as_next_errors
x = nil
PromiseV2.value(2)
.then { raise "hue" }
.rescue { raise "omg" }
.rescue { |v| x = v }
.always { assert_equal(x.class, RuntimeError) }
end
def test_allows_then_to_be_called_multiple_times
pr = PromiseV2.value(2)
x = 1
ps = []
ps << pr.then { x += 1 }
ps << pr.then { x += 1 }
PromiseV2.when(ps).always { assert_equal(x, 3) }
end
def test_raises_with_thenB_if_a_promise_has_already_been_chained
pr = PromiseV2.new
pr.then! {}
assert_raise(ArgumentError) { pr.then! {} }
end
def test_should_pass_a_delayed_falsy_value
pr = PromiseV2.new.resolve(5).then { nil }
pr.always do |value|
assert_equal(value, nil)
end
end
end
Version data entries
28 entries across 28 versions & 1 rubygems