P2 Description
From https://godoc.org/github.com/apache/beam/sdks/go/pkg/beam/testing/passert#Sum:
> Sum validates that the incoming PCollection<int> is a singleton with the given value.
Why is there a size argument if the input is supposed to be a singleton?
From the implementation, it seems that Sum sums all elements from the input PCollection (which must be int, apparently?), and checks both the number of elements and their sum.
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