A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z

Jest

Jest is a unit testing framework.

Easy setup: Complete and easy to set-up JavaScript testing solution. Works out of the box for any React project.
Instant feedback: Fast interactive watch mode runs only test files related to changed files and is optimized to give signal quickly.
Snapshot testing: Capture snapshots of React trees or other serializable values to simplify testing and to analyze how state changes over time.

Philosophies

One of Jest’s philosophies is to provide an integrated “zero-configuration” experience. We observed that when engineers are provided with ready-to-use tools, they end up writing more tests, which in turn results in more stable and healthy codebases.