Adjust cucumber scenarios for diff-lcs

features/custom_matchers/define_diffable_matcher.feature

@@ -2,7 +2,33 @@ 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
+  @skip-when-diff-lcs-1.3
+  Scenario: define a diffable matcher (with diff-lcs 1.4)
+    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 +1 @@
+             -three
+             +two
+      """
+
+  @skip-when-diff-lcs-1.4
+  Scenario: define a diffable matcher (with diff-lcs 1.3)
     Given a file named "diffable_matcher_spec.rb" with:
       """ruby
       RSpec::Matchers.define :be_just_like do |expected|
@@ -27,10 +53,53 @@ Feature: define diffable matcher
               lines
       """
 
+  @skip-when-diff-lcs-1.3
   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 +1,6 @@
+           -No
+            Data
+           -here
+    """
+
+  @skip-when-diff-lcs-1.4
+  Scenario: Redefine actual (with diff-lcs 1.3)
     Given a file named "redefine_actual_matcher_spec.rb" with:
       """ruby
       RSpec::Matchers.define :have_content do |expected|

features/diffing.feature

@@ -32,7 +32,35 @@ Feature: diffing
                   string
       """
 
-  Scenario: diff for a multiline string and a regexp
+  @skip-when-diff-lcs-1.3
+  Scenario: diff for a multiline string and a regexp on diff-lcs 1.4
+    Given a file named "example_spec.rb" with:
+      """ruby
+      RSpec.describe "a multiline string" do
+        it "is like another string" do
+          expected = /expected/m
+          actual = <<-ACTUAL
+      this is the
+        actual
+          string
+      ACTUAL
+          expect(actual).to match expected
+        end
+      end
+      """
+    When I run `rspec example_spec.rb`
+    Then the output should contain:
+      """
+             Diff:
+             @@ -1,3 +1,5 @@
+             -/expected/m
+             +this is the
+             +  actual
+             +    string
+      """
+
+  @skip-when-diff-lcs-1.4
+  Scenario: diff for a multiline string and a regexp on diff-lcs 1.3
     Given a file named "example_spec.rb" with:
       """ruby
       RSpec.describe "a multiline string" do

features/support/diff_lcs_versions.rb

@@ -0,0 +1,15 @@
+Around "@skip-when-diff-lcs-1.4" do |scenario, block|
+  if Diff::LCS::VERSION.to_f >= 1.4
+    warn "Skipping scenario #{scenario.title} on #{Diff::LCS::VERSION.to_f}"
+  else
+    block.call
+  end
+end
+
+Around "@skip-when-diff-lcs-1.3" do |scenario, block|
+  if Diff::LCS::VERSION.to_f < 1.4
+    warn "Skipping scenario #{scenario.title} on #{Diff::LCS::VERSION.to_f}"
+  else
+    block.call
+  end
+end