<s>
The	O
JavaTest	B-Language
harness	I-Language
(	O
or	O
jtreg	B-Language
)	O
is	O
a	O
regression	O
tests	O
framework	O
specifically	O
designed	O
by	O
Sun	O
Microsystems	O
to	O
test	O
the	O
reference	O
Java	B-Device
platform	I-Device
implementation	O
.	O
</s>
<s>
Although	O
jtreg	B-Language
was	O
originally	O
designed	O
to	O
execute	O
Technology	B-Language
Compatibility	I-Language
Kit	I-Language
(	O
TCK	O
)	O
compliance	O
tests	O
,	O
it	O
is	O
not	O
designed	O
to	O
check	O
compliance	O
of	O
a	O
particular	O
Java	B-Language
implementation	O
to	O
the	O
specification	O
,	O
but	O
to	O
test	O
any	O
regressions	O
suite	O
for	O
the	O
Java	B-Device
platform	I-Device
.	O
</s>
<s>
jtreg	B-Language
started	O
in	O
1997	O
,	O
during	O
JDK	O
1.2	O
development	O
.	O
</s>
<s>
Being	O
developed	O
prior	O
to	O
JUnit	B-Language
existence	O
,	O
jtreg	B-Language
was	O
initially	O
not	O
compatible	O
with	O
JUnit	B-Language
's	O
test	O
syntax	O
,	O
but	O
later	O
versions	O
added	O
a	O
limited	O
compatibility	O
with	O
JUnit	B-Language
.	O
</s>
<s>
OpenJDK	B-Language
,	O
the	O
open-source	B-Application
implementation	O
of	O
the	O
Java	B-Language
programming	I-Language
language	I-Language
encourages	O
the	O
use	O
of	O
jtreg	B-Language
tests	O
for	O
patch	O
submissions	O
.	O
</s>
