Was 'unit' originally intended to be a test you could run in isolation? I don't think so. I'm not an expert in testing history, but this Dec 2000 Software Quali

Was 'unit' originally intended to be a test you could run in isolation? I don't think so. I'm not an expert in testing history, but this Dec 2000 Software Quality Assurance guide from the Nuclear Regulatory Commission defines Unit Testing as: > Unit Testing - It is defined as testing of a unit of software such as a subroutine that can be compiled or assembled. The unit is relatively small; e.g., on the order of 100 lines. A separate driver is designed and implemented in order to test the unit in the range of its applicability. NUREG-1737 https://www.nrc.gov/docs/ML0101/ML010170081.pdf https://www.nrc.gov/docs/ML0101/ML010170081.pdf Going back, this 1993 nuclear guidance has simililar language: > A unit of software is an element of the software design that can be compiled or assembled and is relatively small (e.g., 100 lines of high-order language code). Require that each software unit be separately tested. NUREG/BR-0167 https://www.nrc.gov/docs/ML0127/ML012750471.pdf https://www.nrc.gov/docs/ML0127/ML012750471.pdf