feat: add tests

Author: Neerajpathak07

lib/node_modules/@stdlib/number/float32/base/signbit/test/test.native.js

@@ -0,0 +1,79 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2018 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 randu = require( '@stdlib/random/base/randu' );
+var round = require( '@stdlib/math/base/special/round' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var toFloat32 = require( '@stdlib/number/float64/base/to-float32' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+
+
+// VARIABLES //
+
+var signbitf = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var opts = {
+	'skip': ( signbitf instanceof Error )
+};
+
+
+// TESTS //
+
+tape( 'main export is a function', opts, function test( t ) {
+	t.ok( true, __filename );
+	t.equal( typeof signbitf, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function returns a boolean', opts, function test( t ) {
+	t.equal( typeof signbitf(5.0), 'boolean', 'returns a boolean' );
+	t.end();
+});
+
+tape( 'the function returns a boolean indicating if a sign bit is on (true) or off (false)', opts, function test( t ) {
+	var bool;
+	var sign;
+	var frac;
+	var exp;
+	var x;
+	var i;
+
+	for ( i = 0; i < 5000; i++ ) {
+		if ( randu() < 0.5 ) {
+			sign = -1.0;
+		} else {
+			sign = 1.0;
+		}
+		frac = randu() * 10.0;
+		exp = round( randu()*44.0 ) - 22;
+		x = sign * frac * pow( 10.0, exp );
+		x = toFloat32( x );
+		bool = signbitf( x );
+		if ( sign < 0.0 ) {
+			t.equal( bool, true, 'returns true for ' + x );
+		} else {
+			t.equal( bool, false, 'returns false for ' + x );
+		}
+	}
+	t.end();
+});