Code Coverage

Percentage of code that gets executed when a test suite is run. There are four common criterias to measure/define the coverage.

• Function Coverage
• Statement Coverage
• Branch Coverage
• Condition Coverage Criteria

Coverage Criteria

Function Coverage

Has every function/method/subroutine of the program been called?

Statement Coverage

Has every statement been executed?

Branch Coverage

Has every branch of every control flow structure been executed (if else, switch, while, ...)

if cond1 && cond2
	puts "Smaller"
else
	puts "Greater"
endif

Test data that would pass

Condition Coverage

Has every boolean sub-expression been evaluated true and false

if cond1 && cond2
	puts "Smaller"
else
	puts "Greater"
endif

In practice

Line(=statement) coverage and Branch coverage are the two most common forms of test coverage.
Statement coverage is also called C1 and Branch coverage C2. With a combination of C1 and C2 you get a total coverage of nearly 100%.