test-doubles.md
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@@ -132,6 +132,8 @@ testing frameworks are more lenient in this respect, which can result in more co
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When we send a message to another object that results in a side effect, we want to verify the side effect.
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+### Terms
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+
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* SUT - System under test
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* DOC - Depended-on component
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* "indirect input" - This is data that gets into the SUT from a DOC. I.e., we're not calling a method with parameters; inputs are getting into the SUT via some DOC. (126)