"喷淋防水性测试" can be translated into English as "Sprinkler Waterproofness Test" or "Water Spray Waterproofing Test".
"Sprinkler Waterproofness Test" emphasizes the use of a sprinkler system to simulate water exposure and assesses the waterproof performance.
"Water Spray Waterproofing Test" highlights the method of applying water via spraying to evaluate the waterproofing capability.
Both translations are accurate and can be used depending on the specific context and emphasis of the test.