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+tdc - Adding plugins for tdc
+
+Author: Brenda J. Butler - bjb@mojatatu.com
+
+ADDING PLUGINS
+--------------
+
+A new plugin should be written in python as a class that inherits from TdcPlugin.
+There are some examples in plugin-lib.
+
+The plugin can be used to add functionality to the test framework,
+such as:
+
+- adding commands to be run before and/or after the test suite
+- adding commands to be run before and/or after the test cases
+- adding commands to be run before and/or after the execute phase of the test cases
+- ability to alter the command to be run in any phase:
+ pre (the pre-suite stage)
+ prepare
+ execute
+ verify
+ teardown
+ post (the post-suite stage)
+- ability to add to the command line args, and use them at run time
+
+
+The functions in the class should follow the following interfaces:
+
+ def __init__(self)
+ def pre_suite(self, testcount, testidlist) # see "PRE_SUITE" below
+ def post_suite(self, ordinal) # see "SKIPPING" below
+ def pre_case(self, test_ordinal, testid) # see "PRE_CASE" below
+ def post_case(self)
+ def pre_execute(self)
+ def post_execute(self)
+ def adjust_command(self, stage, command) # see "ADJUST" below
+ def add_args(self, parser) # see "ADD_ARGS" below
+ def check_args(self, args, remaining) # see "CHECK_ARGS" below
+
+
+PRE_SUITE
+
+This method takes a testcount (number of tests to be run) and
+testidlist (array of test ids for tests that will be run). This is
+useful for various things, including when an exception occurs and the
+rest of the tests must be skipped. The info is stored in the object,
+and the post_suite method can refer to it when dumping the "skipped"
+TAP output. The tdc.py script will do that for the test suite as
+defined in the test case, but if the plugin is being used to run extra
+tests on each test (eg, check for memory leaks on associated
+co-processes) then that other tap output can be generated in the
+post-suite method using this info passed in to the pre_suite method.
+
+
+SKIPPING
+
+The post_suite method will receive the ordinal number of the last
+test to be attempted. It can use this info when outputting
+the TAP output for the extra test cases.
+
+
+PRE_CASE
+
+The pre_case method will receive the ordinal number of the test
+and the test id. Useful for outputing the extra test results.
+
+
+ADJUST
+
+The adjust_command method receives a string representing
+the execution stage and a string which is the actual command to be
+executed. The plugin can adjust the command, based on the stage of
+execution.
+
+The stages are represented by the following strings:
+
+ 'pre'
+ 'setup'
+ 'command'
+ 'verify'
+ 'teardown'
+ 'post'
+
+The adjust_command method must return the adjusted command so tdc
+can use it.
+
+
+ADD_ARGS
+
+The add_args method receives the argparser object and can add
+arguments to it. Care should be taken that the new arguments do not
+conflict with any from tdc.py or from other plugins that will be used
+concurrently.
+
+The add_args method should return the argparser object.
+
+
+CHECK_ARGS
+
+The check_args method is so that the plugin can do validation on
+the args, if needed. If there is a problem, and Exception should
+be raised, with a string that explains the problem.
+
+eg: raise Exception('plugin xxx, arg -y is wrong, fix it')