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--- gio2-3.1.0/test/test-file.rb.debug	2016-11-29 15:46:48.185008989 +0900
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+++ gio2-3.1.0/test/test-file.rb	2016-11-29 15:57:53.859681592 +0900
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@@ -24,7 +24,7 @@
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       path = fixture_path("content-type", "x-content", "unix-software")
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       dir = Gio::File.path(path)
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       assert_equal(["x-content/unix-software"],
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-                   dir.guess_content_types.collect(&:to_s))
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+                   dir.guess_content_types.collect(&:to_s).uniq)
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     end
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   end
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 end