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