<s>
Self-testing	B-General_Concept
code	I-General_Concept
is	O
software	O
that	O
incorporates	O
built-in	O
tests	O
(	O
see	O
test-first	O
development	O
)	O
.	O
</s>
<s>
In	O
Java	B-Language
,	O
to	O
execute	O
a	O
unit	O
test	O
from	O
the	O
command	B-Application
line	I-Application
,	O
a	O
class	O
can	O
have	O
methods	O
like	O
the	O
following	O
.	O
</s>
<s>
In	O
addition	O
,	O
Java	B-Language
has	O
some	O
Jupiter	O
API	O
libraries	O
for	O
self-testing	B-General_Concept
code	I-General_Concept
.	O
</s>
