Features
- instrument classes for coverage either offline (before they are loaded) or on the fly (using an instrumenting application classloader).
- Supported coverage types: class, method, line, basic block. EMMA can detect when a single source code line is covered only partially.
- Coverage stats are aggregated at method, class, package, and "all classes" levels.
- Output report types: plain text, HTML, XML. All report types support drill-down, to a user-controlled detail depth. The HTML report supports source code linking.
- Output reports can highlight items with coverage levels below user-provided thresholds.
- Coverage data obtained in different instrumentation or test runs can be merged.
- it is possible to dump or reset coverage data remotely and without a JVM exit.
- does not require access to the source code and degrades gracefully with decreasing amount of debug information available in the input classes.
- can instrument individual .class files or entire .jars (in place, if desired). Efficient coverage subset filtering is possible, too.
- Makefile and ANT build integration are supported on equal footing.
- The runtime overhead of added instrumentation is small (5–20%) and the bytecode instrumentor itself is very fast (mostly limited by file I/O speed). Memory overhead is a few hundred bytes per Java class.
- EMMA is 100% pure Java, has no external library dependencies, and works in any Java 2 JVM (even 1.2.x).
Read more about this topic: EMMA (code Coverage Tool)
Famous quotes containing the word features:
“These, then, will be some of the features of democracy ... it will be, in all likelihood, an agreeable, lawless, particolored commonwealth, dealing with all alike on a footing of equality, whether they be really equal or not.”
—Plato (c. 427–347 B.C.)
“All visible objects, man, are but as pasteboard masks. But in each event—in the living act, the undoubted deed—there, some unknown but still reasoning thing puts forth the mouldings of its features from behind the unreasoning mask. If man will strike, strike through the mask!”
—Herman Melville (1819–1891)
“Each reader discovers for himself that, with respect to the simpler features of nature, succeeding poets have done little else than copy his similes.”
—Henry David Thoreau (1817–1862)