Function havingValue

used to perform a a !== null && a !== undefined comparison between the where a is the actual result like:

const t = new AftTest('description', () => null);
await t.verify(() => 'foobarbaz', havingValue()); // succeeds
await t.verify(() => false, havingValue()); // succeeds
await t.verify(() => 0, havingValue()); // succeeds
await t.verify(() => null, havingValue()); // fails
await t.verify(() => undefined, havingValue()); // fails
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