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Function `std.exception.assertNotThrown`

Asserts that the given expression does not throw the given type of Throwable. If a Throwable of the given type is thrown, it is caught and does not escape assertNotThrown. Rather, an AssertError is thrown. However, any other Throwables will escape.


						
				auto auto assertNotThrown(T, E)
				(
				

				  lazy E expression,
				

				  string msg = null,
				

				  string file = __FILE__,
				

				  size_t line = __LINE__
				

				);

Parameters

Name	Description
T	The `Throwable` to test for.
expression	The expression to test.
msg	Optional message to output on test failure. If msg is empty, and the thrown exception has a non-empty msg field, the exception's msg field will be output on test failure.
file	The file where the error occurred. Defaults to `__FILE__`.
line	The line where the error occurred. Defaults to `__LINE__`.

Throws

AssertError if the given Throwable is thrown.

Returns

the result of expression.

Example

import core.exception : AssertError;

import std.string;
assertNotThrown!StringException(enforce!StringException(true, "Error!"));

//Exception is the default.
assertNotThrown(enforce!StringException(true, "Error!"));

assert(collectExceptionMsg!AssertError(assertNotThrown!StringException(
           enforce!StringException(false, "Error!"))) ==
       `assertNotThrown failed: StringException was thrown: Error!`);

Authors

Andrei Alexandrescu and Jonathan M Davis

License

Boost License 1.0