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<HTML
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><TITLE
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>Testing Filters</TITLE
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TITLE="Running an eCos Test Case"
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TITLE="Using the command line"
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>eCos User Guide</TH
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><A
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>Prev</A
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><TD
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>Chapter 12. Running an <SPAN
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>eCos</SPAN
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> Test Case</TD
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><H1
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><A
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NAME="TESTING-FILTERS">Testing Filters</H1
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><P
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>While most test cases today run solely in the target environment,
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some packages may require external testing infrastructure and/or
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feedback from the external environment to do complete testing.</P
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><P
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>The serial package is an example of this. The network package
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also contains some tests that require programs to be run on a
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host. See the network <I
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>Tests and Demonstrations</I
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>
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section in the network documentation in the <I
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><SPAN
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>eCos</SPAN
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> Reference
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Guide</I
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>. Here we will concentrate on the serial tests since
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these are applicable to more targets.</P
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><P
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>Since the serial line is also used for communication with
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GDB, a  filter is inserted in the communication pathway between
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GDB and the serial device which is connected to the hardware target.
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The filter forwards all communication between the two, but also
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listens for special commands embedded in the data stream from the
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target.</P
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><P
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>When such a command is seen, the filter stops forwarding data
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to GDB from the target and enters a special mode. In this mode
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the test case running on the target is able to control the filter,
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commanding it to run various tests. While these tests run, GDB is
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isolated from the target.</P
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><P
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>As the test completes (or if the filter detects a target crash)
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the communication path between GDB and the hardware target is re-established,
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allowing GDB to resume control.</P
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><P
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>In theory, it is possible to extend the filter to provide
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a generic framework for other target-external testing components,
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thus decoupling the testing infrastructure from the (possibly limited)
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communication means provided by the target (serial, JTAG, Ethernet,
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etc). </P
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><P
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>Another advantage is that the host tools do not need to
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know about the various testing environments required by the <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>
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packages, since all contact with the target continues to happen
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via GDB.</P
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>Using the command line</TD
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HREF="running-an-ecos-test-case.html"
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>Up</A
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>Building and Running Sample Applications</TD
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