/usr/share/doc/ruby-rspec-expectations/features/custom_matchers/define_diffable_matcher.feature is in ruby-rspec-expectations 3.4.0c3e0m1s1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | Feature: define diffable matcher
When a matcher is defined as diffable, the output will include a diff of the submitted objects when the objects are more than simple primitives.
Scenario: define a diffable matcher
Given a file named "diffable_matcher_spec.rb" with:
"""ruby
RSpec::Matchers.define :be_just_like do |expected|
match do |actual|
actual == expected
end
diffable
end
RSpec.describe "two\nlines" do
it { is_expected.to be_just_like("three\nlines") }
end
"""
When I run `rspec ./diffable_matcher_spec.rb`
Then it should fail with:
"""
Diff:
@@ -1,3 +1,3 @@
-three
+two
lines
"""
Scenario: Redefine actual
Sometimes is neccessary to overwrite actual to make diffing work, e.g. if `actual` is a name of a file you want to read from. For this to work you need to overwrite `@actual` in your matcher.
Given a file named "redefine_actual_matcher_spec.rb" with:
"""ruby
RSpec::Matchers.define :have_content do |expected|
match do |actual|
@actual = File.read(actual).chomp
values_match? expected, @actual
end
diffable
end
RSpec.describe 'Compare files' do
context 'when content is equal' do
it { expect('data.txt').to have_content 'Data' }
end
context 'when files are different' do
it { expect('data.txt').to have_content "No\nData\nhere" }
end
end
"""
And a file named "data.txt" with:
"""
Data
"""
When I run `rspec ./redefine_actual_matcher_spec.rb --format documentation`
Then the exit status should not be 0
And the output should contain:
"""
2 examples, 1 failure
"""
And the output should contain:
"""
@@ -1,4 +1,2 @@
-No
Data
-here
"""
|