The outcome a test must produce in order to pass. If the actual outcome

A personal copy of the files being managed by a version control system

A path

A specification of a set of values, and the operations that can be performed on them. The term “abstract” means that the implementation of the ADT is hidden from other code.

A data structure that represents the structure of a program or program fragment. Its leaves are literals, such as numbers and variable names, while its internal nodes represent higher-level structures [..]

The actual result of a unit test

The rate at which the work performed by an algorithm grows as a function of problem size, ignoring constant factors. Algorithmic complexity is usually expressed using O

A second (or subsequent) reference to a single piece of data. Aliasing can make programs more difficult to understand, since changes made through one reference “magically” affect the other.

An element of a regular expression

The source-level external interface that a library or operating system provides for other programs to use. See also: Application Binary Interface (API)