test: add test case

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/assert/is-input-casting-policy/test/test.js

@@ -40,6 +40,7 @@ tape( 'the function returns `true` if provided a supported policy', function tes
 	values = [
 		'none',
 		'promoted',
+		'accumulation',
 		'output'
 	];
 	for ( i = 0; i < values.length; i++ ) {