test: add tests for signed zeros

Author: kgryte

lib/node_modules/@stdlib/math/base/special/atan/test/test.js

@@ -27,6 +27,8 @@ var EPS = require( '@stdlib/constants/float64/eps' );
 var PINF = require( '@stdlib/constants/float64/pinf' );
 var NINF = require( '@stdlib/constants/float64/ninf' );
 var PI = require( '@stdlib/constants/float64/pi' );
+var isNegativeZero = require( '@stdlib/math/base/assert/is-negative-zero' );
+var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
 var atan = require( './../lib' );
 
 
@@ -369,18 +371,36 @@ tape( 'the function computes the arctangent on the interval `[1e300,1e308]`', fu
 
 tape( 'the function returns `NaN` if provided `NaN`', function test( t ) {
 	var v = atan( NaN );
-	t.equal( isnan( v ), true, 'returns NaN' );
+	t.equal( isnan( v ), true, 'returns expected value' );
 	t.end();
 });
 
 tape( 'the function returns `pi/2` if provided `+infinity`', function test( t ) {
 	var v = atan( PINF );
-	t.equal( v, PI/2, 'returns pi/2' );
+	t.equal( v, PI/2, 'returns expected value' );
 	t.end();
 });
 
 tape( 'the function returns `-pi/2` if provided `-infinity`', function test( t ) {
 	var v = atan( NINF );
-	t.equal( v, -PI/2, 'returns -pi/2' );
+	t.equal( v, -PI/2, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `-0` if provided `-0`', function test( t ) {
+	var v = atan( -0.0 );
+	t.equal( isNegativeZero( v ), true, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `0` if provided +0', function test( t ) {
+	var v;
+
+	v = atan( 0.0 );
+	t.equal( isPositiveZero( v ), true, 'returns expected value' );
+
+	v = atan( +0.0 );
+	t.equal( isPositiveZero( v ), true, 'returns expected value' );
+
 	t.end();
 });

lib/node_modules/@stdlib/math/base/special/atan/test/test.native.js

@@ -29,6 +29,8 @@ var EPS = require( '@stdlib/constants/float64/eps' );
 var PINF = require( '@stdlib/constants/float64/pinf' );
 var NINF = require( '@stdlib/constants/float64/ninf' );
 var PI = require( '@stdlib/constants/float64/pi' );
+var isNegativeZero = require( '@stdlib/math/base/assert/is-negative-zero' );
+var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
 
 
 // FIXTURES //
@@ -378,18 +380,36 @@ tape( 'the function computes the arctangent on the interval `[1e300,1e308]`', op
 
 tape( 'the function returns `NaN` if provided `NaN`', opts, function test( t ) {
 	var v = atan( NaN );
-	t.equal( isnan( v ), true, 'returns NaN' );
+	t.equal( isnan( v ), true, 'returns expected value' );
 	t.end();
 });
 
 tape( 'the function returns `pi/2` if provided `+infinity`', opts, function test( t ) {
 	var v = atan( PINF );
-	t.equal( v, PI/2, 'returns pi/2' );
+	t.equal( v, PI/2, 'returns expected value' );
 	t.end();
 });
 
 tape( 'the function returns `-pi/2` if provided `-infinity`', opts, function test( t ) {
 	var v = atan( NINF );
-	t.equal( v, -PI/2, 'returns -pi/2' );
+	t.equal( v, -PI/2, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `-0` if provided `-0`', opts, function test( t ) {
+	var v = atan( -0.0 );
+	t.equal( isNegativeZero( v ), true, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `0` if provided +0', opts, function test( t ) {
+	var v;
+
+	v = atan( 0.0 );
+	t.equal( isPositiveZero( v ), true, 'returns expected value' );
+
+	v = atan( +0.0 );
+	t.equal( isPositiveZero( v ), true, 'returns expected value' );
+
 	t.end();
 });