Error:test_validate_cache(WriteCacheBenchmarks): NoMethodError: undefined method `wait_until_clean'

[simonxuhao]

Error:test_validate_cache(WriteCacheBenchmarks):
NoMethodError: undefined method wait_until_clean' for # /root/device-mapper-test-suite/lib/dmtest/tests/writecache/benchmarks.rb:55:in block (3 levels) in '
/root/device-mapper-test-suite/lib/dmtest/ensure_elapsed.rb:13:in ensure_elapsed_time' /root/device-mapper-test-suite/lib/dmtest/writecache-stack.rb:71:in block in activate_top_level'
/root/device-mapper-test-suite/lib/dmtest/ensure_elapsed.rb:13:in ensure_elapsed_time' /root/device-mapper-test-suite/lib/dmtest/device-mapper/lexical_operators.rb:15:in block in with_dev'
/root/device-mapper-test-suite/lib/dmtest/prelude.rb:6:in bracket' /root/device-mapper-test-suite/lib/dmtest/device-mapper/lexical_operators.rb:13:in with_dev'
/root/device-mapper-test-suite/lib/dmtest/writecache-stack.rb:69:in activate_top_level' /root/device-mapper-test-suite/lib/dmtest/tests/writecache/benchmarks.rb:49:in block (2 levels) in '
/root/device-mapper-test-suite/lib/dmtest/ensure_elapsed.rb:13:in ensure_elapsed_time' /root/device-mapper-test-suite/lib/dmtest/writecache-stack.rb:64:in block in activate_support_devs'
/root/device-mapper-test-suite/lib/dmtest/ensure_elapsed.rb:13:in ensure_elapsed_time' /root/device-mapper-test-suite/lib/dmtest/device-mapper/lexical_operators.rb:42:in block in with_devs'
/root/device-mapper-test-suite/lib/dmtest/prelude.rb:6:in bracket' /root/device-mapper-test-suite/lib/dmtest/device-mapper/lexical_operators.rb:37:in with_devs'
/root/device-mapper-test-suite/lib/dmtest/writecache-stack.rb:58:in activate_support_devs' /root/device-mapper-test-suite/lib/dmtest/tests/writecache/benchmarks.rb:43:in block in '