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发表于 2011-11-20 15:48 |只看该作者 |倒序浏览

Ruby 1.9 Rspec 风格 Unit Test MiniTest::Spec介绍

MiniTest是1.9后加到ruby标准库里的。其中，有几个部分当在1.9中写

Ruby代码

1.require 'test/unit'

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require 'test/unit'时，会兼容的把MiniTest:Unit载入，然而MiniTest::Unit只是增加了assertions

比较显著的部分是MiniTest::Spec和MiniTest::Mock,夜猪对此比较感冒，当然效果是比不了Rspec啦，比如before do还是不能支持before :all do这样的回调。对于ruby标准库来说还是不错的开始。简介如下：

例如之前的unittest可能会这么写

Ruby代码

1.require 'test/unit'
2.
3.class TestArray < Test::Unit::TestCase
4. def test_array_can_be_created_with_no_arguments
5. assert_instance_of Array, Array.new
6. end
7.
8. def test_array_of_specific_length_can_be_created
9. assert_equal 10, Array.new(10).size
10. end
11.end
require 'test/unit'
class TestArray < Test::Unit::TestCase
def test_array_can_be_created_with_no_arguments
assert_instance_of Array, Array.new
end
def test_array_of_specific_length_can_be_created
assert_equal 10, Array.new(10).size
end
end

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之后，可以这样写

Ruby代码

1.require 'minitest/spec'
2.require 'minitest/autorun'
3.
4.describe Array do
5. it "can be created with no arguments" do
6. Array.new.must_be_instance_of Array
7. end
8.
9. it "can be created with a specific size" do
10. Array.new(10).size.must_equal 10
11. end
12.end
require 'minitest/spec'
require 'minitest/autorun'
describe Array do
it "can be created with no arguments" do
Array.new.must_be_instance_of Array
end
it "can be created with a specific size" do
Array.new(10).size.must_equal 10
end
end

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再来一个之前的setup和teardown

Ruby代码

1.require 'minitest/autorun'
2.
3.class TestMeme < MiniTest::Unit::TestCase
4. def setup
5. @meme = Meme.new
6. end
7.
8. def test_that_kitty_can_eat
9. assert_equal "OHAI!", @meme.i_can_has_cheezburger?
10. end
11.
12. def test_that_it_will_not_blend
13. refute_match /^no/i, @meme.will_it_blend?
14. end
15.end
require 'minitest/autorun'
class TestMeme < MiniTest::Unit::TestCase
def setup
@meme = Meme.new
end
def test_that_kitty_can_eat
assert_equal "OHAI!", @meme.i_can_has_cheezburger?
end
def test_that_it_will_not_blend
refute_match /^no/i, @meme.will_it_blend?
end
end

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变成如下：

Ruby代码

1. require 'minitest/autorun'
2.
3. describe Meme do
4. before do
5. @meme = Meme.new
6. end
7.
8. describe "when asked about cheeseburgers" do
9. it "must respond positively" do
10. @meme.i_can_has_cheezburger?.must_equal "OHAI!"
11. end
12. end
13.
14. describe "when asked about blending possibilities" do
15. it "won't say no" do
16. @meme.will_it_blend?.wont_match /^no/i
17. end
18. end
19. end
20.#这里是我说的那个，还是不支持所有测试before :all
require 'minitest/autorun'
describe Meme do
before do
@meme = Meme.new
end
describe "when asked about cheeseburgers" do
it "must respond positively" do
@meme.i_can_has_cheezburger?.must_equal "OHAI!"
end
end
describe "when asked about blending possibilities" do
it "won't say no" do
@meme.will_it_blend?.wont_match /^no/i
end
end
end

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#这里是我说的那个，还是不支持所有测试before :all

下一篇准备说说MiniTest的Mock
这里也支持skip方法就是cucumber里的@wip

值得注意的是，这个minitest/spec的支持只有短短300多行代码，有条件的推荐读。

然后写unit test一定想知道assertions都有啥吧

Ruby代码

1.obj.must_be(operator, expected) # for example, 10.must_be :< , 11
2.obj.must_be_close_to # the equivalent of assert_in_delta
3.obj.must_be_empty - Fails unless obj.empty?
4.obj.must_be_instance_of(klass) # Fails unless obj.class == klass
5.obj.must_be_kind_of(klass) # Fails unless obj is of class klass or klass is one of its superclasses.
6.obj.must_be_nil
7.obj.must_be_same_as $ tests for true object equality
8.lambda {}.must_be_silent
9.obj.must_be_within_delta
10.obj.must_be_within_epsilon
11.obj.must_equal(other) # Does a ==/eql? comparison between two objects.
12.obj.must_include(other)
13.obj.must_match(regex) # A regular expression match, e.g. "hello".must_match /w+/
14.lambda {}.must_output(stdout, [stderr..]) # The block should have certain output on stdout or stderr. Set stdout to nil just to check stderr.
15.lambda {}.must_raise(exception)
16.obj.must_respond_to(message)
17.obj.must_throw(sym)
18.wont_be
19.wont_be_empty
20.wont_be_instance_of
21.wont_be_kind_of
22.wont_be_nil
23.wont_be_same_as
24.wont_equal
25.wont_include
26.wont_match
27.wont_respond_to
obj.must_be(operator, expected) # for example, 10.must_be :< , 11
obj.must_be_close_to # the equivalent of assert_in_delta
obj.must_be_empty - Fails unless obj.empty?
obj.must_be_instance_of(klass) # Fails unless obj.class == klass
obj.must_be_kind_of(klass) # Fails unless obj is of class klass or klass is one of its superclasses.
obj.must_be_nil
obj.must_be_same_as $ tests for true object equality
lambda {}.must_be_silent
obj.must_be_within_delta
obj.must_be_within_epsilon
obj.must_equal(other) # Does a ==/eql? comparison between two objects.
obj.must_include(other)
obj.must_match(regex) # A regular expression match, e.g. "hello".must_match /w+/
lambda {}.must_output(stdout, [stderr..]) # The block should have certain output on stdout or stderr. Set stdout to nil just to check stderr.
lambda {}.must_raise(exception)
obj.must_respond_to(message)
obj.must_throw(sym)
wont_be
wont_be_empty
wont_be_instance_of
wont_be_kind_of
wont_be_nil
wont_be_same_as
wont_equal
wont_include
wont_match
wont_respond_to