test: add test case for sx

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---

Author: Planeshifter

lib/node_modules/@stdlib/ndarray/base/ternary-loop-interchange-order/test/test.js

@@ -231,6 +231,7 @@ tape( 'the function returns loop interchange data (all disorganized)', function
 tape( 'if provided empty arrays, the function returns empty arrays', function test( t ) {
 	var o = ternaryLoopOrder( [], [], [], [], [] );
 	t.deepEqual( o.sh, [], 'returns expected value' );
+	t.deepEqual( o.sx, [], 'returns expected value' );
 	t.deepEqual( o.sy, [], 'returns expected value' );
 	t.deepEqual( o.sz, [], 'returns expected value' );
 	t.deepEqual( o.sw, [], 'returns expected value' );