How do I check (at runtime) if one class is a subclass of another?
You can use issubclass() like this assert issubclass(suit, Suit).
assert
Exception Vs Assertion
Use assertions for internal logic checks within your code, and normal exceptions for error conditions outside your immediate code’s control. Don’t forget that assertions can be turned on and off – if you care about things like argument validation, that should be explicit using exceptions. (You could, however, choose to perform argument validation on private … Read more
How to check if an object is a list or tuple (but not string)?
In python 2 only (not python 3): assert not isinstance(lst, basestring) Is actually what you want, otherwise you’ll miss out on a lot of things which act like lists, but aren’t subclasses of list or tuple.
What is the “assert” function?
assert will terminate the program (usually with a message quoting the assert statement) if its argument turns out to be false. It’s commonly used during debugging to make the program fail more obviously if an unexpected condition occurs. For example: assert(length >= 0); // die if length is negative. You can also add a more … Read more
How to enable the Java keyword assert in Eclipse program-wise?
To be specific: Go to Run->run configuration select java application in left nav pan. right click and select New. select Arguments tab Add -ea in VM arguments.
Ways to ASSERT expressions at build time in C
NEW ANSWER : In my original answer (below), I had to have two different macros to support assertions in a function scope and at the global scope. I wondered if it was possible to come up with a single solution that would work in both scopes. I was able to find a solution that worked … Read more
PHPUnit assert that an exception was thrown?
<?php require_once ‘PHPUnit/Framework.php’; class ExceptionTest extends PHPUnit_Framework_TestCase { public function testException() { $this->expectException(InvalidArgumentException::class); // or for PHPUnit < 5.2 // $this->setExpectedException(InvalidArgumentException::class); //…and then add your test code that generates the exception exampleMethod($anInvalidArgument); } } expectException() PHPUnit documentation PHPUnit author article provides detailed explanation on testing exceptions best practices.
How do I use Assert to verify that an exception has been thrown?
For “Visual Studio Team Test” it appears you apply the ExpectedException attribute to the test’s method. Sample from the documentation here: A Unit Testing Walkthrough with Visual Studio Team Test [TestMethod] [ExpectedException(typeof(ArgumentException), “A userId of null was inappropriately allowed.”)] public void NullUserIdInConstructor() { LogonInfo logonInfo = new LogonInfo(null, “P@ss0word”); }
Disable assertions in Python
#How do I disable assertions in Python? There are multiple approaches that affect a single process, the environment, or a single line of code. I demonstrate each. For the whole process Using the -O flag (capital O) disables all assert statements in a process. For example: $ python -Oc “assert False” $ python -c “assert … Read more
Can I use assert on Android devices?
See the Embedded VM Control document (raw HTML from the source tree, or a nicely formatted copy). Basically, the Dalvik VM is set to ignore assertion checks by default, even though the .dex byte code includes the code to perform the check. Checking assertions is turned on in one of two ways: (1) by setting … Read more