If the argument list is the same every time:

expect(object).to receive(:foo).with('argument').and_return('response 1', 'response 2')

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If the argument list differs between invocations:

expect(object).to receive(:foo).with('argument 1').ordered.and_return('response 1')
expect(object).to receive(:foo).with('argument 2').ordered.and_return('response 2')