before the test day vs before the testing day

Question

A complete search of the internet has found these results:

before the test day is the most popular phrase on the web.

Some examples from the web:

Nathanael Berthon confident on the Magny
Cours circuit, where today there were the collective test before the two
day of races.
This year, Test Day is just two weeks before the race, making it more convenient for teams and their sponsors.
Note: if complete degradation is attained before the test time is over and this result is confirmed by a second analysis on the next day, the test can be concluded.
One half of the CWM
LCR Honda Team began the first of three test days at the Sepang International Circuit in Malaysia today, as preparations for the 2015 season continued before the testing ban comes into force during December and January.
The test period shall comprise 30 test days.

Some examples from the web:

The GP2 Main Series circus will meet next week in Paul Ricard on March 12th and 13th for the last testing days before the opening of the 2008 Championship which will kick off in Barcelona on April 26th.
Giove
B is already in Baikonur, where it will undergo final testing before launch day.
At least seven days before testing, sufficient colonies are transferred aseptically into fresh sterile medium and cultured for 7
10 days under the conditions of the test.
Methane (CH4) response shall be verified within 185 days before testing.
Verify CH4 response: upon initial installation, within 185 days before testing, and after major maintenance.
Before the difficulties and the testing time arrive.

Answer 1

More popular!

before the test day

534,000 results on the web

Answer 2

47,300 results on the web