我在RSpec中有一个自定义匹配器,忽略空格/换行符,只匹配内容：
RSpec::Matchers.define :be_matching_content do |expected|
match do |actual|
actual.gsub(/\s/,'').should == expected.gsub(/\s/,'')
end
diffable
end
我可以像这样使用它：
body = " some data \n more data"
body.should be_matching_content("some data\nmore wrong data")
但是,当测试失败时(如上所述),diff输出看起来不太好：
-some data -more wrong data + some data + more data
是否可以配置diffable输出？第一行有些数据是正确的,但第二行错误数据是错误的.仅将第二行作为失败的根本原因是非常有用的.
解决方法
我相信你应该在RSpec中禁用默认的diffable行为并替换你自己的实现：
RSpec::Matchers.define :be_matching_content do |expected|
match do |actual|
@stripped_actual = actual.gsub(/\s/,'')
@stripped_expected = expected.gsub(/\s/,'')
expect(@stripped_actual).to eq @stripped_expected
end
failure_message do |actual|
message = "expected that #{@stripped_actual} would match #{@stripped_expected}"
message += "\nDiff:" + differ.diff_as_string(@stripped_actual,@stripped_expected)
message
end
def differ
RSpec::Support::Differ.new(
:object_preparer => lambda { |object| RSpec::Matchers::Composable.surface_descriptions_in(object) },:color => RSpec::Matchers.configuration.color?
)
end
end
RSpec.describe 'something'do
it 'should diff correctly' do
body = " some data \n more data"
expect(body).to be_matching_content("some data\nmore wrong data")
end
end
产生以下内容：
Failures:
1) something should diff correctly
Failure/Error: expect(body).to be_matching_content("some data\nmore wrong data")
expected that somedatamoredata would match somedatamorewrongdata
Diff:
@@ -1,2 +1,2 @@
-somedatamorewrongdata
+somedatamoredata
如果需要,您可以使用自定义不同,甚至可以将整个匹配器重新实现为对diff命令的系统调用,如下所示：
♥ diff -uw --label expected --label actual <(echo " some data \n more data") <(echo "some data\nmore wrong data")
--- expected
+++ actual
@@ -1,2 @@
some data
- more data
+more wrong data
干杯!