unit testing - Ruby minitest assert_output syntax -



unit testing - Ruby minitest assert_output syntax -

i new minitest , still new ruby , tired of trying google question without result. grateful help:

what exact syntax of assert_output in ruby minitest?

all find on github or elsewhere seems utilize parentheses. yet, error message when don't utilize block assert_output, makes sense definition of method contains yield statement.

but cannot create work, whatever try.

testclass.rb

class testclass def output puts 'hey' end end

test_test.rb

require 'minitest/spec' require 'minitest/autorun' require_relative 'testclass' class testtestclass < minitest::unit::testcase def setup @test = testclass.new end def output_produces_output assert_output( stdout = 'hey' ) { @test.output} end end

what is:

finished tests in 0.000000s, nan tests/s, nan assertions

0 tests, 0 assertions, 0 failures, 0 errors, 0 skips

what doing wrong? must totally obvious, cannot figure out. help.

in order test method run, method name needs start test_. also, way assert_output works block write stdout/stderr, , arguments checked if match stdout/stderr. easiest way check imo pass in regexp. how write test:

class testtestclass < minitest::unit::testcase def setup @test = testclass.new end def test_output_produces_output assert_output(/hey/) { @test.output} end end

ruby unit-testing minitest assertions

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