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safe_test.rb
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safe_test.rb
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require 'test_helper'
class Micro::Case::SafeTest < Minitest::Test
class Divide < Micro::Case::Safe
attributes :a, :b
def call!
if a.is_a?(Integer) && b.is_a?(Integer)
Success(result: { number: a / b })
else
Failure(:not_an_integer)
end
end
end
def test_instance_call_method
result = Divide.new(a: 2, b: 2).call
assert_success_result(result, value: { number: 1 })
# ---
result = Divide.new(a: 2.0, b: 2).call
assert_failure_result(result, type: :not_an_integer, value: { not_an_integer: true })
end
def test_class_call_method
result = Divide.call(a: 4, b: 2)
assert_success_result(result, { number: 2 })
# ---
result = Divide.call(a: 2.0, b: 2)
assert_failure_result(result, type: :not_an_integer, value: { not_an_integer: true })
end
class Foo < Micro::Case::Safe
end
def test_template_method
assert_raises(NotImplementedError) { Micro::Case::Safe.call }
assert_raises(NotImplementedError) { Micro::Case::Safe.new({}).call }
assert_raises(NotImplementedError) { Foo.call }
assert_raises(NotImplementedError) { Foo.new({}).call }
end
class LoremIpsum < Micro::Case::Safe
attributes :text
def call!
text
end
end
def test_result_error
assert_raises_with_message(
Micro::Case::Error::UnexpectedResult,
/LoremIpsum#call! must return an instance of Micro::Case::Result/
) { LoremIpsum.call(text: 'lorem ipsum') }
assert_raises_with_message(
Micro::Case::Error::UnexpectedResult,
/LoremIpsum#call! must return an instance of Micro::Case::Result/
) { LoremIpsum.new(text: 'ipsum indolor').call }
end
def test_that_exceptions_generate_a_failure
[
Divide.new(a: 2, b: 0).call,
Divide.call(a: 2, b: 0)
].each do |result|
assert_exception_result(result, value: { exception: ZeroDivisionError })
end
end
class Divide2ByArgV1 < Micro::Case::Safe
attribute :arg
def call!
Success result: 2 / arg
rescue => e
Failure result: e
end
end
class Divide2ByArgV2 < Micro::Case::Safe
attribute :arg
def call!
Success(result: 2 / arg)
rescue => e
Failure result: e
end
end
class Divide2ByArgV3 < Micro::Case::Safe
attribute :arg
def call!
Success(result: 2 / arg)
rescue => e
Failure :foo, result: e
end
end
class GenerateZeroDivisionError < Micro::Case::Safe
attribute :arg
def call!
Failure(result: arg / 0)
rescue => e
Success(result: e)
end
end
def test_the_rescue_of_an_exception_inside_of_a_safe_use_case
[
Divide2ByArgV1.call(arg: 0),
Divide2ByArgV2.call(arg: 0)
].each do |result|
assert_exception_result(result, value: { exception: ZeroDivisionError })
end
# ---
result = Divide2ByArgV3.call(arg: 0)
assert_exception_result(result, type: :foo, value: { exception: ZeroDivisionError })
# ---
result = GenerateZeroDivisionError.call(arg: 2)
assert_success_result(result)
assert_kind_of(ZeroDivisionError, result.value[:exception])
end
def test_that_when_a_failure_result_is_a_symbol_both_type_and_value_will_be_the_same
result = Divide.call(a: 2, b: 'a')
assert_failure_result(result, value: { not_an_integer: true })
end
def test_to_proc
results = [
{a: 2, b: 2},
{a: 4, b: 2},
{a: 6, b: 2},
{a: 8, b: 2}
].map(&Divide)
values = results.map(&:value)
assert_equal(
[{number: 1}, {number: 2}, {number: 3}, {number: 4}],
values
)
end
end