Add fail fast to test runner.

Passing `--fail-fast` to the test runner will now abort the test run
on the first failure. The run continues on any unexpected errors.

1 files changed, 15 insertions, 0 deletions

diff --git a/railties/test/application/test_runner_test.rb b/railties/test/application/test_runner_test.rb
index 4e747b5253..acfba21f1c 100644
--- a/railties/test/application/test_runner_test.rb
+++ b/railties/test/application/test_runner_test.rb
@@ -355,6 +355,21 @@ module ApplicationTests
       assert_match %r{Running:\n\nF\n\nwups!\n\nbin/rails test test/models/post_test.rb:4}, output
     end
 
+    def test_fail_fast
+      app_file 'test/models/post_test.rb', <<-RUBY
+        require 'test_helper'
+
+        class PostTest < ActiveSupport::TestCase
+          def test_post
+            assert false, 'wups!'
+          end
+        end
+      RUBY
+
+      assert_match(/Interrupt/,
+        capture(:stderr) { run_test_command('test/models/post_test.rb --fail-fast') })
+    end
+
     def test_raise_error_when_specified_file_does_not_exist
       error = capture(:stderr) { run_test_command('test/not_exists.rb') }
       assert_match(%r{cannot load such file.+test/not_exists\.rb}, error)