Properly yielding responses in Rspec

We had some problem with configuring response that should be yielded to block… after a short investigation, here are outcomes

allow(collection).to receive(:each).and_yield([1, 2])

will yield array ([1, 2]) to one block variable

allow(collection).to receive(:each).and_yield(1, 2)

will yield two values (1, 2) to two block variables

allow(collection).to receive(:each).and_yield(1).and_yield(2)

will yield two consecutive values (1, 2) to one block variable, twice

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