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COST
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----
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This property describes the cost of a test. When parallel testing is
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enabled, tests in the test set will be run in descending order of cost.
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Projects can explicitly define the cost of a test by setting this property
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to a floating point value.
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When the cost of a test is not defined by the project,
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:manual:`ctest <ctest(1)>` will initially use a default cost of ``0``.
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It computes a weighted average of the cost each time a test is run and
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uses that as an improved estimate of the cost for the next run. The more
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a test is re-run in the same build directory, the more representative the
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cost should become.
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