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Test cases for L{twisted.logger._io}.
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Tests for L{LoggingFile}.
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Create a logger for test L{LoggingFile} instances to use.
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Some L{LoggingFile} attributes are read-only.
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Some L{LoggingFile} methods are unsupported.
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Default level is L{LogLevel.info} if not set.
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Default encoding is C{sys.getdefaultencoding()} if not set.
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The C{newlines} attribute is L{None}.
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The C{name} attribute is fixed.
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L{LoggingFile.close} closes the file.
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L{LoggingFile.fileno} returns C{-1}.
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L{LoggingFile.isatty} returns C{False}.
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Writing buffers correctly.
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Bytes are decoded to text.
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Unicode is unmodified.
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Log level is emitted properly.
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Log format is C{"{message}"}.
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C{writelines} does not add newlines.
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L{LoggingFile} can replace L{sys.stdout}.
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Construct a L{LoggingFile} with a built-in observer.
@param level: C{level} argument to L{LoggingFile}
@param encoding: C{encoding} argument to L{LoggingFile}
@return: a L{TestLoggingFile} with an observer that appends received
events into the file's C{events} attribute (a L{list}) and
event messages into the file's C{messages} attribute (a L{list}).
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