feat: add blas/ext/base/cindex-of-truthy

lib/node_modules/@stdlib/blas/ext/base/cindex-of-falsy/test/test.ndarray.native.js

@@ -0,0 +1,152 @@
+/**
+* @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 resolve = require( 'path' ).resolve;
+var tape = require( 'tape' );
+var Complex64Array = require( '@stdlib/array/complex64' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+
+
+// VARIABLES //
+
+var cindexOfFalsy = tryRequire( resolve( __dirname, './../lib/ndarray.native.js' ) );
+var opts = {
+	'skip': ( cindexOfFalsy instanceof Error )
+};
+
+
+// TESTS //
+
+tape( 'main export is a function', opts, function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof cindexOfFalsy, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function returns the index of the first falsy element', opts, function test( t ) {
+	var actual;
+	var x;
+
+	x = new Complex64Array([
+		1.0,
+		1.0,
+		0.0,
+		0.0,
+		1.0,
+		1.0,
+		2.0,
+		2.0,
+		0.0,
+		0.0,
+		1.0,
+		1.0
+	]);
+
+	// Nonnegative stride...
+	actual = cindexOfFalsy( x.length, x, 1, 0 );
+	t.strictEqual( actual, 1, 'returns expected value' );
+
+	actual = cindexOfFalsy( x.length-1, x, 1, 1 );
+	t.strictEqual( actual, 0, 'returns expected value' );
+
+	actual = cindexOfFalsy( x.length-2, x, 1, 2 );
+	t.strictEqual( actual, 2, 'returns expected value' );
+
+	actual = cindexOfFalsy( 1, x, 1, 0 );
+	t.strictEqual( actual, -1, 'returns expected value' );
+
+	// Negative stride...
+	actual = cindexOfFalsy( x.length, x, -1, x.length-1 );
+	t.strictEqual( actual, 1, 'returns expected value' );
+
+	actual = cindexOfFalsy( 3, x, -2, x.length-1 );
+	t.strictEqual( actual, 2, 'returns expected value' );
+
+	actual = cindexOfFalsy( 3, x, -2, x.length-2 );
+	t.strictEqual( actual, 0, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function treats `NaN` values as falsy (e.g., `NaN+NaNi`, `NaN+0i`)', opts, function test( t ) {
+	var actual;
+	var x;
+
+	x = new Complex64Array([
+		2.0,
+		1.0,
+		3.0,
+		1.0,
+		NaN,
+		0.0,
+		1.0,
+		1.0
+	]);
+
+	actual = cindexOfFalsy( x.length, x, 1, 0 );
+	t.strictEqual( actual, 2, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function returns `-1` if unable to find a falsy element', opts, function test( t ) {
+	var actual;
+	var x;
+
+	x = new Complex64Array([
+		1.0,
+		2.0,
+		3.0,
+		4.0,
+		5.0,
+		6.0,
+		7.0,
+		8.0
+	]);
+
+	actual = cindexOfFalsy( x.length, x, 1, 0 );
+	t.strictEqual( actual, -1, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function returns `-1` if provided an `N` parameter which is less than or equal to zero', opts, function test( t ) {
+	var actual;
+	var x;
+
+	x = new Complex64Array([
+		0.0,
+		0.0,
+		1.0,
+		2.0,
+		3.0,
+		4.0
+	]);
+
+	actual = cindexOfFalsy( 0, x, 1, 0 );
+	t.strictEqual( actual, -1, 'returns expected value' );
+
+	actual = cindexOfFalsy( -1, x, 1, 0 );
+	t.strictEqual( actual, -1, 'returns expected value' );
+
+	t.end();
+});