Unit tests for method_exists

[ishifoev]

We have some code blocks we can't coverage test because of method exists which is false if the class is mocked.
Example

if (method_exists($node, 'getDirectoryListing')) {
			error_log("methd exists on node");
			$nodes = $node->getDirectoryListing();
			$result = array_map(function (\OCP\Files\Node $node) {
				return $this->normalizeNodeInfo($node);
			}, $nodes);
		}
		return $result;

[michielbdejong]

This seems relevant: https://stackoverflow.com/questions/37927273/how-to-unit-test-a-php-method-exists