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Add assert.throws

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Closes #57.
This commit is contained in:
Domenic Denicola 2014-12-03 18:29:52 -05:00
parent 3883a2e906
commit fa4c337570
1 changed files with 22 additions and 0 deletions
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22
test/harness/assert.js
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@ -40,3 +40,25 @@ assert.notSameValue = function (actual, unexpected, message) {
}
$ERROR(message);
};
assert.throws = function (expectedErrorConstructor, func) {
if (func === undefined) {
$ERROR('assert.throws requires two arguments: the error constructor and a function to run');
return;
}
try {
func();
} catch (thrown) {
if (typeof thrown !== 'object' || thrown === null) {
$ERROR('Thrown value was not an object!');
return;
}
if (thrown.constructor !== expectedErrorConstructor) {
$ERROR('Expected a ' + expectedErrorConstructor.name + ' but got a ' + thrown.constructor.name);
}
return;
}
$ERROR('Expected a ' + expectedErrorConstructor.name + ' to be thrown but no exception was thrown at all');
};