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POTesting for an Asynchronous throw in Mocha
 

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  1. POTesting for an Asynchronous throw in Mocha
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    <p>I have a block of code that tries to reconnect to Redis if a connection breaks. If it can not re-establish connection, it throws an error. I am trying to test the block of code that throws the error, but I am unable to write a successful test using mocha and chai.</p> <p>My test looks like this:</p> <pre><code> it('throws an error when a connection can\'t be established', function (done) { var c = redisClient.newClient(); c.end(); sinon.stub(redisClient, 'newClient', function () { return { connected: false }; }); redisClient.resetConnection(c, 2, 100, function (err) { done(); }); process.on('uncaughtException', function (err) { err.message.should.equal('Redis: unable to re-establish connection'); done(); }); }); </code></pre> <p>I've tried using the assert().throws but that fails before the asynchronous throw occurs. A try/catch block also fails for the same reason. My guess is that mocha captures the exception and re-throws it because the uncaughtException block does get the error, but not before mocha has failed the test. Any suggestions?</p> <p>Edit:</p> <p>I had tried wrapping the call in a function:</p> <pre><code>var a = function() {redisClient.resetConnection(c, 2, 100, function () { done('Should not reach here'); }); }; expect(a).to.throw(/unable to re-establish connect/); </code></pre> <p>and I get the following:</p> <pre><code>✖ 1 of 5 tests failed: 1) RedisClient .resetConnection emits an error when a connection can't be established: expected [Function] to throw an error </code></pre>
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