test: add accessor tests

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---

Author: gururaj1512

lib/node_modules/@stdlib/stats/base/nanmeanwd/test/test.main.js renamed to lib/node_modules/@stdlib/stats/base/nanmeanwd/test/test.nanmeanwd.js

@@ -99,6 +99,21 @@ tape( 'if provided an `N` parameter less than or equal to `0`, the function retu
 	t.end();
 });
 
+tape( 'if provided an `N` parameter less than or equal to `0`, the function returns `NaN` (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
+
+	v = nanmeanwd( 0, toAccessorArray( x ), 1 );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	v = nanmeanwd( -1, toAccessorArray( x ), 1 );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'if provided an `N` parameter equal to `1`, the function returns the first element', function test( t ) {
 	var x;
 	var v;
@@ -111,6 +126,18 @@ tape( 'if provided an `N` parameter equal to `1`, the function returns the first
 	t.end();
 });
 
+tape( 'if provided an `N` parameter equal to `1`, the function returns the first element (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
+
+	v = nanmeanwd( 1, toAccessorArray( x ), 1 );
+	t.strictEqual( v, 1.0, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'the function supports a `stride` parameter', function test( t ) {
 	var x;
 	var v;
@@ -253,3 +280,30 @@ 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,
+		NaN,  // 4
+		NaN
+	]);
+
+	x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
+
+	v = nanmeanwd( 5, toAccessorArray( x1 ), 2 );
+	t.strictEqual( v, 1.25, 'returns expected value' );
+
+	t.end();
+});

lib/node_modules/@stdlib/stats/base/nanmeanwd/test/test.ndarray.js

@@ -98,6 +98,21 @@ tape( 'if provided an `N` parameter less than or equal to `0`, the function retu
 	t.end();
 });
 
+tape( 'if provided an `N` parameter less than or equal to `0`, the function returns `NaN` (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
+
+	v = nanmeanwd( 0, toAccessorArray( x ), 1, 0 );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	v = nanmeanwd( -1, toAccessorArray( x ), 1, 0 );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'if provided an `N` parameter equal to `1`, the function returns the first indexed element', function test( t ) {
 	var x;
 	var v;
@@ -110,6 +125,18 @@ tape( 'if provided an `N` parameter equal to `1`, the function returns the first
 	t.end();
 });
 
+tape( 'if provided an `N` parameter equal to `1`, the function returns the first indexed element (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
+
+	v = nanmeanwd( 1, toAccessorArray( x ), 1, 0 );
+	t.strictEqual( v, 1.0, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'the function supports a `stride` parameter', function test( t ) {
 	var x;
 	var v;