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Contents
# frozen_string_literal: true
require_relative '../spec_helper' # Use the RSpec framework
require 'stringio'
# Load the class under test
require_relative '../../lib/loxxy/back_end/engine'
module Loxxy
module BackEnd
describe Engine do
let(:sample_options) do
{ ostream: StringIO.new }
end
subject { Engine.new(sample_options) }
context 'Initialization:' do
it 'should accept a option Hash at initialization' do
expect { Engine.new(sample_options) }.not_to raise_error
end
it 'should know its config options' do
expect(subject.config).to eq(sample_options)
end
it 'should have an empty stack' do
expect(subject.stack).to be_empty
end
end
context 'Listening to visitor events:' do
let(:greeting) { Datatype::LXString.new('Hello, world') }
let(:sample_pos) { double('fake-position') }
let(:var_decl) { Ast::LoxVarStmt.new(sample_pos, 'greeting', greeting) }
let(:lit_expr) { Ast::LoxLiteralExpr.new(sample_pos, greeting) }
it "should react to 'after_var_stmt' event" do
expect { subject.after_var_stmt(var_decl) }.not_to raise_error
current_env = subject.symbol_table.current_env
expect(current_env.defns['greeting']).to be_kind_of(Variable)
expect(current_env.defns['greeting'].value).to eq(greeting)
end
it "should react to 'before_literal_expr' event" do
expect { subject.before_literal_expr(lit_expr) }.not_to raise_error
expect(subject.stack.pop).to eq(greeting)
end
end
end # describe
end # module
end # module
Version data entries
14 entries across 14 versions & 1 rubygems