test: add accessor tests

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---

Author: gururaj1512

lib/node_modules/@stdlib/stats/base/max-by/test/test.max_by.js

@@ -330,6 +330,31 @@ tape( 'the function supports view offsets', function test( t ) {
 	t.end();
 });
 
+tape( 'the function supports view offsets (accessors)', function test( t ) {
+	var x0;
+	var x1;
+	var v;
+
+	x0 = new Float64Array([
+		2.0,
+		1.0,  // 0
+		2.0,
+		-2.0, // 1
+		-2.0,
+		2.0,  // 2
+		3.0,
+		4.0,  // 3
+		6.0
+	]);
+
+	x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
+
+	v = maxBy( 4, toAccessorArray( x1 ), 2, accessor );
+	t.strictEqual( v, 8.0, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'the function supports providing a callback execution context', function test( t ) {
 	var ctx;
 	var x;
@@ -348,3 +373,22 @@ tape( 'the function supports providing a callback execution context', function t
 		return v * 2.0;
 	}
 });
+
+tape( 'the function supports providing a callback execution context (accessors)', function test( t ) {
+	var ctx;
+	var x;
+
+	x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
+	ctx = {
+		'count': 0
+	};
+	maxBy( x.length, toAccessorArray( x ), 1, accessor, ctx );
+
+	t.strictEqual( ctx.count, x.length, 'returns expected value' );
+	t.end();
+
+	function accessor( v ) {
+		this.count += 1; // eslint-disable-line no-invalid-this
+		return v * 2.0;
+	}
+});

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

@@ -323,6 +323,25 @@ tape( 'the function supports an offset parameter', function test( t ) {
 	t.end();
 });
 
+tape( 'the function supports an offset parameter (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [
+		1.0,
+		-2.0, // 0
+		3.0,
+		4.0,  // 1
+		5.0,
+		-6.0  // 2
+	];
+
+	v = maxBy( 3, toAccessorArray( x ), 2, 1, accessor );
+	t.strictEqual( v, 8.0, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'the function supports providing a callback execution context', function test( t ) {
 	var ctx;
 	var x;
@@ -341,3 +360,22 @@ tape( 'the function supports providing a callback execution context', function t
 		return v * 2.0;
 	}
 });
+
+tape( 'the function supports providing a callback execution context (accessors)', function test( t ) {
+	var ctx;
+	var x;
+
+	x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
+	ctx = {
+		'count': 0
+	};
+	maxBy( x.length, toAccessorArray( x ), 1, 0, accessor, ctx );
+
+	t.strictEqual( ctx.count, x.length, 'returns expected value' );
+	t.end();
+
+	function accessor( v ) {
+		this.count += 1; // eslint-disable-line no-invalid-this
+		return v * 2.0;
+	}
+});