'tested over time' is correct and usable in written English.
You can use it to express that something has been put to the test, and has stood up to the scrutiny of the passing of time. For example, "The effectiveness of the medicine was tested over time, and it proved to be an effective remedy."
What this slide shows you is some of the designs that have been tested over time.
Where technical questions are difficult, particularly on health care costs, reformers have advocated demonstration projects that can be tested over time.
But a good marriage can also be tested over time by the stresses of everyday life like raising children, long work hours, or chronic health problems leading to marital distress or even divorce.
Building the railway probably doesn't signal a shift to a more confrontational style for the erstwhile governor, but it shows that Brown's leadership qualities, tested over time, afford him options that any negotiator can learn from.
I'd say most boyband songs still follow a very traditional pop song structure which is tried and tested over time to be hugely successful, however: It's verse, chorus, verse chorus, middle eight/bridge, double chorus with a possible key change.
In fact, the standard terminology used in leases is based on legal precedents that have been tried and tested over time and provide all parties with clarity and certainty.
Clicky, the Clickable Value-Wheel, is one of several potential marketing instruments Groupon has and will continue to test over time, some of which will be successful while others will not.
Consensus-based methods to improve laboratory assays will continue to increase the reliability of ER, PR, and HER2 tests over time [ 54, 55].
As the time interval between INR tests varies within individual patients, as well as the duration of therapy, a standard measure to indicate frequency of testing over time is number of INR tests per patient year.
In this study, provision of rapid HIV testing to men who have sex with men attending a health service did not result in a sustained increase in their frequency of testing over time when compared with conventional HIV testing.
The data showed there was no fentanyl present in any weed samples tested over that time period.
