test: add empty input case

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---

Author: headlessNode

lib/node_modules/@stdlib/ndarray/base/find/test/test.js

@@ -23,6 +23,10 @@
 // MODULES //
 
 var tape = require( 'tape' );
+var ones = require( '@stdlib/array/ones' );
+var ndarray = require( '@stdlib/ndarray/ctor' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+var isSameValue = require( '@stdlib/assert/is-same-value' );
 var find = require( './../lib' );
 
 
@@ -33,3 +37,23 @@ tape( 'main export is a function', function test( t ) {
 	t.strictEqual( typeof find, 'function', 'main export is a function' );
 	t.end();
 });
+
+tape( 'the function returns the sentinel value if provided an empty input ndarray', function test( t ) {
+	var actual;
+	var sv;
+	var x;
+
+	sv = scalar2ndarray( NaN, {
+		'dtype': 'float64'
+	});
+	x = ndarray( 'float64', ones( 8, 'float64' ), [ 0 ], [ 1 ], 0, 'row-major' );
+
+	actual = find( [ x, sv ], clbk );
+	t.strictEqual( isSameValue( actual, NaN ), true, 'returns expected value' );
+
+	t.end();
+
+	function clbk( v ) {
+		return v !== 0.0;
+	}
+});