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.

2 files changed, 13 insertions, 0 deletions

diff --git a/railties/lib/rails/test_unit/minitest_plugin.rb b/railties/lib/rails/test_unit/minitest_plugin.rb
index b65d67b2a5..3a0a58df88 100644
--- a/railties/lib/rails/test_unit/minitest_plugin.rb
+++ b/railties/lib/rails/test_unit/minitest_plugin.rb
@@ -33,6 +33,11 @@ module Minitest
       options[:output_inline] = false
     end
 
+    opts.on("-f", "--fail-fast",
+            "Abort test run on first failure") do
+      options[:fail_fast] = true
+    end
+
     options[:patterns] = opts.order!
   end
 
diff --git a/railties/lib/rails/test_unit/reporter.rb b/railties/lib/rails/test_unit/reporter.rb
index c88e9aa60e..8f1116b6af 100644
--- a/railties/lib/rails/test_unit/reporter.rb
+++ b/railties/lib/rails/test_unit/reporter.rb
@@ -17,6 +17,10 @@ module Rails
         io.puts format_rerun_snippet(result)
         io.puts
       end
+
+      if fail_fast? && result.failure && !result.error? && !result.skipped?
+        raise Interrupt
+      end
     end
 
     def report
@@ -48,6 +52,10 @@ module Rails
         options.fetch(:output_inline, true)
       end
 
+      def fail_fast?
+        options[:fail_fast]
+      end
+
       def format_rerun_snippet(result)
         location, line = result.method(result.name).source_location
         "#{self.executable} #{relative_path_for(location)}:#{line}"