36 lines
939 B
Ruby
36 lines
939 B
Ruby
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require 'spec_helper'
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describe 'Maybe()' do
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include ConvertableNull::Conversions
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specify 'given nil, returns a null object' do
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expect(Maybe(nil).class).to be(ConvertableNull)
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end
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specify 'given a null object, returns the same null object' do
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null = ConvertableNull.get
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expect(Maybe(null)).to be(null)
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end
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specify 'given anything in null_equivalents, return a null object' do
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expect(Maybe('').class).to be(ConvertableNull)
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end
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specify 'given anything else, returns the input unchanged' do
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expect(Maybe(false)).to be(false)
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str = 'hello'
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expect(Maybe(str)).to be(str)
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end
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it 'generates null objects with useful trace info' do
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null, line = Maybe(), __LINE__
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expect(null.__file__).to eq(__FILE__)
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expect(null.__line__).to eq(line)
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end
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it 'also works with blocks' do
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expect(Maybe { nil }.class).to eq(ConvertableNull)
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expect(Maybe { 'foo' }).to eq('foo')
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end
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end
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