Separation of testing front- and back-ends.

From: Brad King (brad.king_at_[hidden])
Date: 2002-01-13 17:58:53

Dave, Joerg,

I have implemented a sample approach to separating the testing front-end
from multiple testing back-ends. The attached Jamfile contains the code.

Developers declare their tests like this:

test.compile test1 : source1 ;
test.compile-fail test2 : source2 ;
test.link test3 : source3 ;
test.link-fail test4 : source4 ;
test.run test5 : source5 : : -foo ;
test.run-fail test6 : source6 : : -bar : test.in ;

After all these tests are declared (after the user jamfile has been
included, for example), these lines appear:

# Let the user list the tests with "jam list-tests"
test.list list-tests ;

# Invoke the "demo" testing module for "jam demo-test".
demo.invoke demo-test ;

The demo.invoke rule just forwards its target to a "test.invoke" rule
which then calls all the test rules with "demo." as a prefix instead of
"test." as a prefix, and with all the same arguments. The test.invoke
method also creates a target for each test automatically. Each of demo's
rules can refer to $(test-target) to set up the target.

This way, the user can update a specific test by saying:
jam demo-test.test1
jam demo-test.test2
...
or update all tests by saying:
jam demo-test

To see what a particular test entails, the user can also list a specific
test:
jam list-tests.test1
jam list-tests.test2
...
or list all tests by saying:
jam list-tests

This approach has the following advantages:

1.) Developers specify their test only once.
2.) Testing back-ends can be added without changing the "test" module.
3.) Users can choose exactly what back end is to be used, and specify
either a specific test or all tests.
4.) Back-end authors can write their rules almost as if they were being
called directly, but they don't have to worry about the test target
name...they just use $(test-target).

Thoughts?
-Brad
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