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crafting-interpreters/ruby/test/lox/test_environment.rb

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1.1 KiB

require_relative "../test_helper"
require "lox/environment"
require "lox/error"
require "lox/token"
class TestEnvironment < Lox::Test
NAME_TOKEN = Lox::Token.new(:IDENTIFIER, "name", "name", 0)
def setup
@env = Lox::Environment.new
end
def test_define
@env.define("name", "value")
assert_equal "value", @env.get(NAME_TOKEN)
end
def test_get
assert_raises Lox::RuntimeError, "Undefined variable name 'name'." do
@env.get(NAME_TOKEN)
end
end
def test_enclosing_define
@env.define("name", "value")
enclosed = Lox::Environment.new(@env)
assert_equal "value", enclosed.get(NAME_TOKEN)
enclosed.define("name", "foo")
assert_equal "foo", enclosed.get(NAME_TOKEN)
end
def test_enclosing_assign
@env.define("name", "foo")
enclosed = Lox::Environment.new(@env)
enclosed.assign(NAME_TOKEN, "bar")
assert_equal "bar", enclosed.get(NAME_TOKEN)
assert_equal "bar", @env.get(NAME_TOKEN)
enclosed.define("name", "baz")
enclosed.assign(NAME_TOKEN, "qux")
assert_equal "qux", enclosed.get(NAME_TOKEN)
assert_equal "bar", @env.get(NAME_TOKEN)
end
end