test: add empty ndarray case

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---

Author: headlessNode

lib/node_modules/@stdlib/ndarray/base/every-by/test/test.js

@@ -21,6 +21,8 @@
 // MODULES //
 
 var tape = require( 'tape' );
+var ones = require( '@stdlib/array/ones' );
+var ndarray = require( '@stdlib/ndarray/ctor' );
 var everyBy = require( './../lib' );
 
 
@@ -31,3 +33,19 @@ tape( 'main export is a function', function test( t ) {
 	t.strictEqual( typeof everyBy, 'function', 'main export is a function' );
 	t.end();
 });
+
+tape( 'the function returns `true` if provided an empty input ndarray', function test( t ) {
+	var actual;
+	var x;
+
+	x = ndarray( 'float64', ones( 8, 'float64' ), [ 0 ], [ 1 ], 0, 'row-major' );
+
+	actual = everyBy( [ x ], clbk );
+	t.strictEqual( actual, true, 'returns expected value' );
+
+	t.end();
+
+	function clbk( v ) {
+		return v !== 0.0;
+	}
+});