* Ability to load and performance test many different server/protocol types: Web - HTTP, HTTPS, SOAP / REST, FTP, Database via JDBC, LDAP, Message-oriented middleware (MOM) via JMS, Mail - SMTP(S), POP3(S) and IMAP(S), Native commands or shell scripts, TCP. * Complete portability and 100% Java purity. * Full multithreading framework allows concurrent sampling by many threads and simultaneous sampling of different functions by separate thread groups. * Careful GUI design allows faster Test Plan building and debugging. * Caching and offline analysis/replaying of test results. * Highly Extensible core: Pluggable Samplers allow unlimited testing capabilities.Several load statistics may be chosen with pluggable timers. Data analysis and visualization plugins allow great extensibility as well as personalization. Functions can be used to provide dynamic input to a test or provide data manipulation.Scriptable Samplers (BeanShell, BSF-compatible languages and JSR223-compatible languages)

zero config -- Jest aims to work out of the box, config free, on most JavaScript projects. snapshots -- Make tests which keep track of large objects with ease. Snapshots live either alongside your tests, or embedded inline. isolated -- Tests are parallelized by running them in their own processes to maximize performance. great api -- From it to expect - Jest has the entire toolkit in one place. Well documented, well maintained, well good.