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Contents
require 'rspec'
require 'hyperion/aux/util'
class Hyperion
describe Util do
describe '::nil_if_error' do
it 'catches StandardErrors in the block' do
expect(Util.nil_if_error { raise 'oops' }).to be_nil
end
it 'does not catch Exceptions in the block' do
expect{Util.nil_if_error { raise Exception }}.to raise_error Exception
end
end
describe '::guard' do
it 'raises a BugException if the value is invalid' do
expect{Util.guard_param(7, 'a string', String)}.to report 'You passed me 7, which is not a string'
expect{Util.guard_param('foo', 'any old number', Numeric)}.to report 'You passed me "foo", which is not any old number'
expect{Util.guard_param(:zero, 'callable') { |x| x.respond_to?(:call) }}.to report 'You passed me :zero, which is not callable'
end
def report(msg)
raise_error BugError, msg
end
end
describe '::callcc' do
it 'returns the value of the block if the continuation is not invoked' do
v = Util.callcc { |_ret| 42 }
expect(v).to eql 42
end
it 'returns the argument if the continuation is invoked' do
v = Util.callcc { |ret| ret.call(99); 42 }
expect(v).to eql 99
end
it 'raises an error if the continuation is invoked outside of the block' do
cont = nil
Util.callcc { |ret| cont = ret }
expect { cont.call(99) }.to raise_error /continuation/
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems