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require 'spec_helper'
describe 'Just()' do
include ConvertableNull::Conversions
specify 'passes non-nullish values through' do
expect(Just(false)).to be(false)
str = 'hello'
expect(Just(str)).to be(str)
end
specify 'rejects nullish values' do
expect { Just(nil) }.to raise_error(ArgumentError)
expect { Just('') }.to raise_error(ArgumentError)
expect { Just(ConvertableNull.get) }.to raise_error(ArgumentError)
end
it 'also works with blocks' do
expect { Just { nil }.class }.to raise_error(ArgumentError)
expect(Just { 'foo' }).to eq('foo')
end
end
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