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require "test/test_helper"
require "instantiator"
class InstantiatorTest < Test::Unit::TestCase
def test_should_instantiate_class_with_no_explicit_initialize
klass = Class.new
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_with_initialize_with_no_parameters
klass = Class.new do
def initialize; end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_with_initialize_with_one_parameter
klass = Class.new do
def initialize(parameter_one); end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_with_initialize_with_multiple_parameters
klass = Class.new do
def initialize(parameter_one, parameter_two, parameter_three, parameter_four); end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_with_initialize_with_only_optional_parameters
klass = Class.new do
def initialize(*optional_parameters); end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_with_initialize_with_some_required_parameters_and_some_optional_parameters
klass = Class.new do
def initialize(parameter_one, parameter_two, *optional_parameters); end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_which_calls_method_on_parameter
klass = Class.new do
def initialize(parameter_one)
parameter_one.foo
end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_which_calls_method_on_multiple_parameters
klass = Class.new do
def initialize(parameter_one, parameter_two, parameter_three, parameter_four)
parameter_one.foo
parameter_two.foo
parameter_three.foo
parameter_four.foo
end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_which_calls_method_on_result_of_calling_method_on_parameter
klass = Class.new do
def initialize(parameter_one)
parameter_one.foo.bar
end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_which_defines_its_own_new_method_with_no_parameters
klass = Class.new do
class << self
alias_method :__new__, :new
def new
__new__("parameter_one")
end
end
def initialize(parameter_one); end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_which_defines_its_own_new_method_with_one_parameter
klass = Class.new do
class << self
alias_method :__new__, :new
def new(parameter_one)
__new__
end
end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_which_defines_its_own_new_method_with_multiple_parameters
klass = Class.new do
class << self
alias_method :__new__, :new
def new(parameter_one, parameter_two, parameter_three, parameter_four)
__new__
end
end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_which_defines_its_own_new_method_with_only_optional_parameters
klass = Class.new do
class << self
alias_method :__new__, :new
def new(*optional_parameters)
__new__
end
end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_which_defines_its_own_new_method_with_some_required_parameters_and_some_optional_parameters
klass = Class.new do
class << self
alias_method :__new__, :new
def new(parameter_one, parameter_two, *optional_parameters)
__new__
end
end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_which_defines_its_own_new_method_which_calls_method_on_parameter
klass = Class.new do
class << self
alias_method :__new__, :new
def new(parameter_one)
parameter_one.foo
__new__
end
end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_which_defines_its_own_new_method_which_calls_method_on_multiple_parameters
klass = Class.new do
class << self
alias_method :__new__, :new
def new(parameter_one, parameter_two, parameter_three, parameter_four)
parameter_one.foo
parameter_two.foo
parameter_three.foo
parameter_four.foo
__new__
end
end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_which_defines_its_own_new_method_which_calls_method_on_result_of_calling_method_on_parameter
klass = Class.new do
class << self
alias_method :__new__, :new
def new(parameter_one)
parameter_one.foo.bar
__new__
end
end
end
instance = klass.instantiate
assert_equal klass, instance.class
end
def test_should_instantiate_class_which_defines_its_own_native_new_method_with_some_required_parameters_and_some_optional
require "strscan"
instance = StringScanner.instantiate
end
def test_should_raise_exception_if_instantiating_class_is_unsupported
e = assert_raises(Instantiator::Error) { Proc.instantiate }
assert_equal "Proc.instantiate is not yet supported", e.message
end
end
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