In a method for generating test transactions across computing systems, a first test function of a first program on a first computing system of a plurality of computing systems receives a plurality of instructions, wherein a first instruction of the plurality of instructions is to invoke a first transaction between a second function of the first program and a second program on a second computing system of the plurality of computing systems. The first test function of the first program causes the transaction between the second function of the first program on the first computing system and the second program on the second computing system. The first test function of the first program sends the plurality of instructions to a second test function on a third computing system of the plurality of computing systems, based on a second instruction of the plurality of instructions.