unit test
Software testing term: testing individual components or modules in isolation.
Developers perform unit tests after writing code.
Integration test; tests interactions between multiple components, while 単体試験 tests a single unit.
Loanword equivalent; often used interchangeably, but 単体試験 is the native Japanese term.
Compound of 単体 (single unit) and 試験 (test). A calque from English 'unit test' used in software engineering.