test: add test.main.js to cover native fallback

Author: rautelaKamal

lib/node_modules/@stdlib/stats/base/dists/chi/skewness/package.json

@@ -34,8 +34,9 @@
   "bugs": {
     "url": "https://github.com/stdlib-js/stdlib/issues"
   },
-  "dependencies": {},
-  "devDependencies": {},
+  "devDependencies": {
+    "proxyquire": "^2.1.3"
+  },
   "engines": {
     "node": ">=0.10.0",
     "npm": ">2.7.0"

lib/node_modules/@stdlib/stats/base/dists/chi/skewness/test/test.main.js

@@ -0,0 +1,101 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var proxyquire = require( 'proxyquire' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var abs = require( '@stdlib/math/base/special/abs' );
+var NINF = require( '@stdlib/constants/float64/ninf' );
+
+
+// FIXTURES //
+
+var data = require( './fixtures/julia/data.json' );
+
+
+// TESTS //
+
+tape( 'main export is a function (pure JavaScript fallback)', function test( t ) {
+	var skewness = proxyquire( './../lib/index.js', {
+		'./native.js': new Error( 'Addon not found' )
+	});
+
+	t.ok( true, __filename );
+	t.strictEqual( typeof skewness, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'if provided `NaN` for `k`, the function returns `NaN` (pure JavaScript fallback)', function test( t ) {
+	var skewness = proxyquire( './../lib/index.js', {
+		'./native.js': new Error( 'Addon not found' )
+	});
+
+	var v = skewness( NaN );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+	t.end();
+});
+
+tape( 'if provided a degrees of freedom parameter `k` that is not a positive number, the function returns `NaN` (pure JavaScript fallback)', function test( t ) {
+	var skewness = proxyquire( './../lib/index.js', {
+		'./native.js': new Error( 'Addon not found' )
+	});
+
+	var v;
+
+	v = skewness( -1.0 );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	v = skewness( 0.0 );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	v = skewness( NINF );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function returns the skewness of a chi distribution (pure JavaScript fallback)', function test( t ) {
+	var skewness = proxyquire( './../lib/index.js', {
+		'./native.js': new Error( 'Addon not found' )
+	});
+
+	var expected;
+	var delta;
+	var tol;
+	var k;
+	var i;
+	var y;
+
+	expected = data.expected;
+	k = data.k;
+	for ( i = 0; i < expected.length; i++ ) {
+		y = skewness( k[i] );
+		if ( y === expected[i] ) {
+			t.strictEqual( y, expected[i], 'k:'+k[i]+', y: '+y+', expected: '+expected[i] );
+		} else {
+			delta = abs( y - expected[ i ] );
+			tol = 1e-11 * abs( expected[ i ] );
+			t.ok( delta <= tol, 'within tolerance. k: '+k[i]+'. y: '+y+'. E: '+expected[ i ]+'. Δ: '+delta+'. tol: '+tol+'.' );
+		}
+	}
+	t.end();
+});