When more than one test for a specific page is run on the same day (verifying by running a test manually, but I'm assuming the same would happen if ran from a cron job) only the last test for that particular day is accessible in the test results. This includes:
In the graph showing the errors for that particular date the previous result is not shown. For example, after a new test is run on the 3rd of June at 16:16, the previous test on 3rd June at 1:30 is not shown on the graph:
On the list of dates available on the left sidebar, each date appears only once even if there's more than one test for a specific date, and clicking on a date will take you to the last test run on that particular date:
When presented with the (last) result for that particular date there's no mention of what time the test was run and no indication that there are other tests results for that particular date:
When more than one test for a specific page is run on the same day (verifying by running a test manually, but I'm assuming the same would happen if ran from a cron job) only the last test for that particular day is accessible in the test results. This includes: