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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
"""
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