<s>
Given-When-Then	B-General_Concept
(	O
GWT	O
)	O
is	O
a	O
semi-structured	O
way	O
to	O
write	O
down	O
test	O
cases	O
.	O
</s>
<s>
They	O
can	O
either	O
be	O
tested	O
manually	O
or	O
automated	O
as	O
browser	O
tests	O
with	O
tools	O
like	O
Selenium	B-Library
and	O
Cucumber	B-Application
.	O
</s>
<s>
The	O
Given-When-Then	B-General_Concept
was	O
proposed	O
by	O
Dan	O
North	O
in	O
2006	O
,	O
as	O
part	O
of	O
behavior-driven	O
development	O
.	O
</s>
