62 lines
1.5 KiB
Ruby
62 lines
1.5 KiB
Ruby
RSpec.describe Mutant::Expression do
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let(:object) { described_class }
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describe '.try_parse' do
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subject { object.try_parse(input) }
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context 'on nonsense' do
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let(:input) { 'foo bar' }
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it { should be(nil) }
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end
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context 'on a valid expression' do
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let(:input) { 'Foo' }
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it { should eql(Mutant::Expression::Namespace::Exact.new('Foo')) }
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end
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context 'on ambiguous expression' do
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class ExpressionA < Mutant::Expression
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register(/\Atest-syntax\z/)
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end
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class ExpressionB < Mutant::Expression
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register(/^test-syntax$/)
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end
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let(:input) { 'test-syntax' }
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it 'raises an exception' do
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expect { subject }.to raise_error(Mutant::Expression::AmbiguousExpressionError, 'Ambiguous expression: "test-syntax"')
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end
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end
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end
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describe '#inspect' do
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let(:object) { described_class.parse('Foo') }
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subject { object.inspect }
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it { should eql('<Mutant::Expression: Foo>') }
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it_should_behave_like 'an idempotent method'
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end
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describe '.parse' do
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subject { object.parse(input) }
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context 'on nonsense' do
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let(:input) { 'foo bar' }
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it 'raises an exception' do
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expect { subject }.to raise_error(Mutant::Expression::InvalidExpressionError, 'Expression: "foo bar" is not valid')
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end
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end
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context 'on a valid expression' do
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let(:input) { 'Foo' }
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it { should eql(Mutant::Expression::Namespace::Exact.new('Foo')) }
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end
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end
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end
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