3752626988096da7f90e4f9360729adb119ad055
test-doubles.md
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218 | 218 | When we send a message to another object that results in a side effect, we want to verify the side effect. |
219 | 219 | |
220 | +In other words, we want to prove that a promised behavior change in a collaborator has been trigger. |
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222 | +Example: |
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223 | + |
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224 | +Our `Converter` provides a means for there to be logging of the conversion. |
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225 | + |
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220 | 226 | ### Terms |
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222 | 228 | * SUT - System under test |