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          text run at (0,0) width 336: "This tests the rendering of invalid UTF-8 sequences."
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          text run at (0,0) width 511: "The output should be: \"\x{442}??\x{442}\" (with black diamonds in place of question marks)."
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          text run at (0,1) width 47: "\x{442}\x{FFFD}\x{FFFD}\x{442}"