Add TaskTestCase

test/support/task_test_case.rb

@@ -0,0 +1,12 @@
+class TaskTestCase < ActiveSupport::TestCase
+  setup do
+    # Rake tasks usually display some results, which mixes up with test results.
+    # This suppresses default stdout and makes Rails.env.test? checks unnecessary.
+    @original_stdout = $stdout
+    $stdout = File.open(File::NULL, 'w')
+  end
+
+  teardown do
+    $stdout = @original_stdout
+  end
+end