Add some regression tests for some popular custom formatter gems.

For rspec#1291.

cucumber.yml

@@ -3,4 +3,4 @@ exclusions = []
 exclusions << ' --tags ~@no-jruby' if RUBY_PLATFORM == 'java'
 %>
 default: --require features --strict --format progress --tags ~@wip<%= exclusions.join %> features
-wip:     --require features --tags @wip:3 --wip features
+wip:     --require features --tags @wip:30 --wip features

features/formatters/regression_tests.feature

@@ -0,0 +1,80 @@
+Feature: Regression tests for legacy custom formatters
+
+  Background:
+    Given a file named "spec/passing_and_failing_spec.rb" with:
+      """ruby
+      RSpec.describe "Some examples" do
+        it "passes" do
+          expect(1).to eq(1)
+        end
+
+        it "fails" do
+          expect(1).to eq(2)
+        end
+
+        context "nested" do
+          it "passes" do
+            expect(1).to eq(1)
+          end
+
+          it "fails" do
+            expect(1).to eq(2)
+          end
+        end
+      end
+      """
+      And a file named "spec/pending_spec.rb" with:
+      """ruby
+      RSpec.describe "Some pending examples" do
+        context "pending" do
+          it "is reported as pending" do
+            pending { expect(1).to eq(2) }
+          end
+
+          it "is reported as failing" do
+            pending { expect(1).to eq(1) }
+          end
+        end
+      end
+      """
+
+  @wip @announce
+  Scenario: Use fuubar formatter
+    When I run `rspec --format Fuubar`
+    Then the output should contain "Progress: |============"
+     And the output should contain "6 examples, 3 failures, 1 pending"
+     And the output should contain "The Fuubar formatter uses the deprecated formatter interface"
+     But the output should not contain any error backtraces
+
+  Scenario: Use rspec-instafail formatter
+    When I run `rspec --format RSpec::Instafail`
+    Then the output should contain "6 examples, 3 failures, 1 pending"
+     And the output should contain "The RSpec::Instafail formatter uses the deprecated formatter interface"
+     But the output should not contain any error backtraces
+
+  Scenario: Use rspec-extra-formatters JUnit formatter
+    When I run `rspec --require rspec-extra-formatters --format JUnitFormatter`
+    Then the output should contain:
+      """
+      <testsuite errors="0" failures="3" skipped="1" tests="6"
+      """
+     And the output should contain "The JUnitFormatter formatter uses the deprecated formatter interface"
+     But the output should not contain any error backtraces
+
+  @wip @announce
+  Scenario: Use rspec-extra-formatters Tap formatter
+    When I run `rspec --require rspec-extra-formatters --format TapFormatter`
+    Then the output should contain "TAP version 13"
+     And the output should contain "The TapFormatter formatter uses the deprecated formatter interface"
+     But the output should not contain any error backtraces
+
+  @wip @announce
+  Scenario: Use rspec-spinner formatter
+    When I run `rspec --require rspec_spinner --format RspecSpinner::Spinner`
+    Then the output should contain "TBD"
+
+  @wip @announce
+  Scenario: Use nyancat formatter
+    When I run `rspec --format NyanCatFormatter`
+    Then the output should contain "TBD"
+

features/step_definitions/additional_cli_steps.rb

@@ -41,6 +41,10 @@
   expect(normalized_output).to match(regexp(partial_output))
 end
 
+Then /^the output should not contain any error backtraces$/ do
+  step %q{the output should not contain "lib/rspec/core"}
+end
+
 # This step can be generalized if it's ever used to test other colors
 Then /^the failing example is printed in magenta$/ do
   # \e[35m = enable magenta

rspec-core.gemspec

@@ -46,8 +46,14 @@ Gem::Specification.new do |s|
   s.add_development_dependency "nokogiri", "1.5.2"
   s.add_development_dependency "coderay",  "~> 1.0.9"
 
-
   s.add_development_dependency "mocha",    "~> 0.13.0"
   s.add_development_dependency "rr",       "~> 1.0.4"
   s.add_development_dependency "flexmock", "~> 0.9.0"
+
+  # For legacy custom formatter regression tests
+  s.add_development_dependency "fuubar",                 "1.3.2"
+  s.add_development_dependency "nyan-cat-formatter",     "0.5.2"
+  s.add_development_dependency "rspec-instafail",        "0.2.4"
+  s.add_development_dependency "rspec_spinner",          "2.0.0"
+  s.add_development_dependency "rspec-extra-formatters", "1.0.0"
 end