Add test for putIfAbsent
method to verify replacement of null values.
#7995
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Add test for
putIfAbsent
method to verify replacement of null values.This new test ensures that when a null value is present, the
putIfAbsent
method replaces it with a new value. The test checks both the return value and the updated state of the map.Fixes #6217
Fixes #7987
RELNOTES=n/a