Excel conditional formatting Text with OR

Sorry but my reply from 3 days ago hasn't been taken into account!! I'll try to rephrase it:
Thank you for the reply, but it doesn't work:
Excel tells me that this is not a formula... :
=OR ($B$1250="test1";$B$1250="test2")
if I remove the "=", it accepts it and transforms the formula into:
="OR ($B$1250=""test1"";$B$1250=""test2"")"
a formula that doesn't work either...
Any other ideas??
Thank you.
Best regards.

Hello
if you followed the path "use a formula...", and if the formula is as you pasted it here, it should be enough to remove the space between OR and the first parenthesis, as well as any space at the end, after the last one for Excel to understand
best regards

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The quality of the answer mainly depends on the clarity of the question, thank you!

Indeed, by removing the spaces, Excel accepts the "formula," but it doesn't work for that reason, because "test1" or "test2" can be in the text field but not alone... if "test1" or "test2" are alone in the field, it works.
I need "test1" or "test2" "mixed" with other text in the field... that's why I chose the "containing..." formula.
Thank you for your response.

Sorry, Excel doesn't want it... (even with an extra parenthesis at the end)
=OR(COUNTIF(B1250,"*test1*'");COUNTIF(B1250,"*test2*"))
Please review the formula if possible
Best regards

UPDATE....
It works, I hadn't put the parenthesis in the right place... replaced a ' with a parenthesis..
=OR(COUNTIF(B1250,"*test1*");COUNTIF(B1250,"*test2*"))
Thank you for everything
Best regards