Only the first argument can be --test-target-dir option

Raise the proper exception when that option is not given but
non-option argument is.

1 files changed, 6 insertions, 8 deletions

diff --git a/tool/test/runner.rb b/tool/test/runner.rb
index db23ae2d33..b3cdba6f17 100644
--- a/tool/test/runner.rb
+++ b/tool/test/runner.rb
@@ -4,14 +4,12 @@ require 'rbconfig'
 tool_dir = File.dirname(File.dirname(File.realpath(__FILE__)))
 src_testdir = nil
 
-while opt = ARGV.shift
-  break if opt == "--"
-  case opt
-  when /\A--test-target-dir=(.*?)\z/
-    src_testdir = File.realpath($1)
-  else
-    raise "unknown runner option: #{ opt }"
-  end
+case ARGV.first
+when /\A--test-target-dir=(.*?)\z/
+  ARGV.shift
+  src_testdir = File.realpath($1)
+else
+  raise "unknown runner option: #{ opt }"
 end
 
 raise "#$0: specify --test-target-dir" if !src_testdir