test: add 4d tests

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---

Author: headlessNode

lib/node_modules/@stdlib/ndarray/base/find/test/test.3d.js

@@ -489,6 +489,47 @@ tape( 'the function returns the first element in a 3-dimensional ndarray which p
 	}
 });
 
+tape( 'the function returns the first element in a 3-dimensional ndarray which passes a test implemented by a predicate function (row-major, non-contiguous, large arrays)', function test( t ) {
+	var actual;
+	var bsize;
+	var ord;
+	var sh;
+	var st;
+	var dt;
+	var sv;
+	var o;
+	var x;
+
+	dt = 'float64';
+	ord = 'row-major';
+
+	bsize = blockSize( dt );
+	sh = [ 2, 1, bsize*2 ];
+	st = [ bsize*4, -bsize*4, 2 ];
+	o = strides2offset( sh, st );
+
+	x = ndarray( dt, oneTo( numel( sh )*2, dt ), sh, st, o, ord );
+	sv = scalar2ndarray( NaN, {
+		'dtype': 'float64'
+	});
+
+	actual = find( [ x, sv ], clbk1 );
+	t.strictEqual( actual, 17.0, 'returns expected value' );
+
+	actual = find( [ x, sv ], clbk2 );
+	t.strictEqual( isSameValue( actual, NaN ), true, 'returns expected value' );
+
+	t.end();
+
+	function clbk1( v ) {
+		return v % 2.0 !== 0.0;
+	}
+
+	function clbk2( v ) {
+		return v < 0.0;
+	}
+});
+
 tape( 'the function returns the first element in a 3-dimensional ndarray which passes a test implemented by a predicate function (row-major, contiguous, accessors)', function test( t ) {
 	var actual;
 	var ord;