http://www.ibm.com/developerworks/java/library/j-cq01316/index.html?ca=drs
There are different types of coverage measurements, but most
tools focus on line coverage, also known as
statement coverage. In addition, some tools report branch
coverage. A test coverage measurement is obtained by exercising a
code base with a test harness and capturing data that corresponds to
code having been "touched" throughout the lifetime of the test
process. The data is then synthesized to produce a coverage report. In
Java shops, the test harness is commonly JUnit and the coverage tool is
usually something like Cobertura, Emma, or Clover, to name a few.
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