test: add accessors test cases

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---

Author: gururaj1512

lib/node_modules/@stdlib/stats/base/nanmeanors/test/test.main.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 = nanmeanors( 0, toAccessorArray( x ), 1 );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	v = nanmeanors( -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;
@@ -110,6 +125,17 @@ 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 = nanmeanors( 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;

lib/node_modules/@stdlib/stats/base/nanmeanors/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 = nanmeanors( 0, toAccessorArray( x ), 1, 0 );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	v = nanmeanors( -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 = nanmeanors( 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;