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@@ -0,0 +1,55 @@
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+module Chervil
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+ RSpec.describe AST::Conditional do
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+ it 'returns the true branch given #t' do
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+ expect(AST::Conditional.new(
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+ AST::Boolean.new(true),
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+ AST::Number.new(1.0),
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+ AST::Number.new(0.0),
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+ ).evaluate(Env.new)).to eq(
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+ 1.0
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+ )
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+ end
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+
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+ it 'returns the false branch given #f' do
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+ expect(AST::Conditional.new(
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+ AST::Boolean.new(false),
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+ AST::Number.new(1.0),
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+ AST::Number.new(0.0),
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+ ).evaluate(Env.new)).to eq(
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+ 0.0
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+ )
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+ end
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+
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+ it 'evaluates complex predicates' do
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+ expect(AST::Conditional.new(
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+ AST::Application.new(
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+ AST::Identifier.new(">"),
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+ [
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+ AST::Number.new(2.0),
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+ AST::Number.new(1.0),
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+ ]
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+ ),
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+ AST::Number.new(2.0),
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+ AST::Number.new(1.0),
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+ ).evaluate(Env.new)).to eq(
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+ 2.0
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+ )
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+ end
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+
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+ it 'evaluates complex branches' do
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+ expect(AST::Conditional.new(
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+ AST::Boolean.new(true),
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+ AST::Application.new(
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+ AST::Identifier.new("+"),
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+ [
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+ AST::Number.new(2.0),
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+ AST::Number.new(1.0),
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+ ]
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+ ),
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+ AST::Number.new(0.0)
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+ ).evaluate(Env.new)).to eq(
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+ 3.0
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+ )
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+ end
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+ end
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+end
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