function branchTracking(iFileIndex, iBranchIndex, vCondition, iLine) {
		if (iBranchIndex >= 0) {
			if (vCondition) {
				aStatistics[iFileIndex].branchTracking[iBranchIndex].truthy += 1;
			} else {
				aStatistics[iFileIndex].branchTracking[iBranchIndex].falsy += 1;
			}
		}

		if (iLine >= 0) {
			lineTracking(iFileIndex, iLine);
		}

		return vCondition;
	}
Keep track of branch coverage.

@param {number} iFileIndex
  The current file's index
@param {number} iBranchIndex
  The current branch's index
@param {any} vCondition
  The current branch's condition
@param {number} [iLine]
  The current branch's line number (for statement coverage)
@returns {any}
  <code>vCondition</code>