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-NAME="TESTING-FILTERS">Testing Filters</H1
-><P
->While most test cases today run solely in the target environment,
-some packages may require external testing infrastructure and/or
-feedback from the external environment to do complete testing.</P
-><P
->The serial package is an example of this. The network package
-also contains some tests that require programs to be run on a
-host. See the network <I
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-section in the network documentation in the <I
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->. Here we will concentrate on the serial tests since
-these are applicable to more targets.</P
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->Since the serial line is also used for communication with
-GDB, a filter is inserted in the communication pathway between
-GDB and the serial device which is connected to the hardware target.
-The filter forwards all communication between the two, but also
-listens for special commands embedded in the data stream from the
-target.</P
-><P
->When such a command is seen, the filter stops forwarding data
-to GDB from the target and enters a special mode. In this mode
-the test case running on the target is able to control the filter,
-commanding it to run various tests. While these tests run, GDB is
-isolated from the target.</P
-><P
->As the test completes (or if the filter detects a target crash)
-the communication path between GDB and the hardware target is re-established,
-allowing GDB to resume control.</P
-><P
->In theory, it is possible to extend the filter to provide
-a generic framework for other target-external testing components,
-thus decoupling the testing infrastructure from the (possibly limited)
-communication means provided by the target (serial, JTAG, Ethernet,
-etc). </P
-><P
->Another advantage is that the host tools do not need to
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