test: add missing test case

Author: headlessNode

lib/node_modules/@stdlib/ndarray/map/test/test.js

@@ -79,7 +79,7 @@ tape( 'the function throws an error if provided a first argument having an unrec
 	}
 });
 
-tape( 'the function throws an error if the callback function is not provided', function test( t ) {
+tape( 'the function throws an error if the second argument is not a function when options are not provided', function test( t ) {
 	var values;
 	var x;
 	var i;
@@ -108,6 +108,39 @@ tape( 'the function throws an error if the callback function is not provided', f
 	}
 });
 
+tape( 'the function throws an error if third argument is not a function when options are provided', function test( t ) {
+	var values;
+	var opts;
+	var x;
+	var i;
+
+	values = [
+		'5',
+		5,
+		true,
+		false,
+		null,
+		void 0,
+		{},
+		[]
+	];
+	x = ndarray( 'generic', ones( 4, 'generic' ), [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
+	opts = {
+		'dtype': 'float64'
+	};
+
+	for ( i = 0; i < values.length; i++ ) {
+		t.throws( badValue( values[i] ), TypeError, 'throws an error when provided ' + values[i] );
+	}
+	t.end();
+
+	function badValue( value ) {
+		return function badValue() {
+			map( x, opts, value );
+		};
+	}
+});
+
 tape( 'the function throws an error if provided an options argument which is not an object', function test( t ) {
 	var values;
 	var x;