C0/C1/C2

C0/C1/C2 is a coverage standards which is correspondence to coverage degree of routes of testing program.

C0 Statement coverage-Has each line of the source code been executed?
C1 Branch coverage-Has each control structure (such as an if statement) evaluated both to true and false?
C2 Condition coverage-Has each boolean sub-expression evaluated both to true and false (this does not necessarily imply decision coverage)?

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