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'''Self-testing code''' is software that incorporates built-in tests (see [[test-first development]]).<ref>{{Cite web |title=Self-testing infrastructure-as-code |url=https://opencredo.com/blogs/self-testing-infrastructure-as-code/ |access-date=2022-12-05 |website=OpenCredo |language=en-US}}</ref><ref>{{Cite web |title=Self Testing Code |url=https://martinfowler.com/bliki/SelfTestingCode.html |access-date=2022-12-05 |website=martinfowler.com}}</ref>

[[Perl]] packages will run their self tests when they are installed using [[CPAN]]. This ensures that they run successfully in the local environment. (There is also a testing community that tests new packages and updated packages on many different platforms.)

In [[Java (programming)|Java]], to execute a [[unit test]] from the [[command line]], a [[class (computer science)|class]] can have methods like the following.
<syntaxhighlight lang="java">
// Executing <code>main</code> runs the unit test.
public static void main(String[] args) {
test();
}

static void test() {
assert foo == bar;
}
</syntaxhighlight>
To invoke a full [[system test]], a class can incorporate a method call.
<syntaxhighlight lang="java">
public static void main(String[] args) {
test();
TestSuite.test(); // invokes full system test
}
</syntaxhighlight>In addition, Java has some Jupiter API libraries for self-testing code. assert can be used in various ways such as assert equals, which checks if the given variable is equal to the value given.<syntaxhighlight lang="java">
@Test
void checkplayer() {
Board board = new Board(10);
board.addplayer(1);
int check = board.getCurrentPlayer(1);
assertEquals(1, check);

}
</syntaxhighlight>

==See also==
*[[Software development]]
*[[Extreme programming]]

== References ==
{{Reflist}}

{{Authority control}}

[[Category:Articles with example Java code]]
[[Category:Unit testing]]

{{Soft-eng-stub}}

Self-testing code - Revision history

imported>Rich Farmbrough: Copyedit.