Raise exceptions on *all* warnings

minitest/minitest@f0f17b9

Author: ParadoxV5

Rakefile

@@ -5,4 +5,7 @@ require 'minitest/test_task'
 # * test:isolated : run tests independently to surface order dependencies
 # * test:deps     : (alias of test:isolated)
 # * test:slow     : run tests and reports the slowest 25
-Minitest::TestTask.create
+Minitest::TestTask.create do |t|
+  t.extra_args << '-Werror' # Raise exceptions for warnings: https://github.com/minitest/minitest/commit/f0f17b9
+  t.test_prelude = 'Warning[:performance] = true' # … including `performance` warnings which are off even with `-w`
+end