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-rw-r--r--lib/test/unit/assertions.rb7
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/test/unit/assertions.rb b/lib/test/unit/assertions.rb
index b9fc2bcf12..ce28042c49 100644
--- a/lib/test/unit/assertions.rb
+++ b/lib/test/unit/assertions.rb
@@ -13,8 +13,11 @@ module Test
UNASSIGNED = Object.new # :nodoc:
def assert(test, msg = UNASSIGNED)
- msg = nil if msg == UNASSIGNED
- unless String === msg or Proc === msg or msg.nil? then
+ case msg
+ when UNASSIGNED
+ msg = nil
+ when String, Proc
+ else
bt = caller.reject { |s| s.rindex(MiniTest::MINI_DIR, 0) }
raise ArgumentError, "assertion message must be String or Proc, but #{msg.class} was given.", bt
end