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-rw-r--r--tool/lib/test/unit.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/tool/lib/test/unit.rb b/tool/lib/test/unit.rb
index 15e290e5f1..45c751033b 100644
--- a/tool/lib/test/unit.rb
+++ b/tool/lib/test/unit.rb
@@ -329,7 +329,7 @@ module Test
def self.launch(ruby,args=[])
scale = EnvUtil.timeout_scale
io = IO.popen([*ruby, "-W1",
- "#{File.dirname(__FILE__)}/unit/parallel.rb",
+ "#{__dir__}/unit/parallel.rb",
*("--timeout-scale=#{scale}" if scale),
*args], "rb+")
new(io, io.pid, :waiting)