test: add tests for infinities

Author: kgryte

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

@@ -24,6 +24,9 @@ var tape = require( 'tape' );
 var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var abs = require( '@stdlib/math/base/special/abs' );
 var EPS = require( '@stdlib/constants/float32/eps' );
+var PINF = require( '@stdlib/constants/float32/pinf' );
+var NINF = require( '@stdlib/constants/float32/ninf' );
+var HALF_PI = require( '@stdlib/constants/float32/half-pi' );
 var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' );
 var isNegativeZerof = require( '@stdlib/math/base/assert/is-negative-zerof' );
 var isPositiveZerof = require( '@stdlib/math/base/assert/is-positive-zerof' );
@@ -399,6 +402,18 @@ tape( 'the function returns `NaN` if provided `NaN`', function test( t ) {
 	t.end();
 });
 
+tape( 'the function returns `pi/2` if provided `+infinity`', function test( t ) {
+	var v = atanf( PINF );
+	t.equal( v, HALF_PI, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `-pi/2` if provided `-infinity`', function test( t ) {
+	var v = atanf( NINF );
+	t.equal( v, -HALF_PI, 'returns expected value' );
+	t.end();
+});
+
 tape( 'the function returns `-0` if provided `-0`', function test( t ) {
 	var v = atanf( -0.0 );
 	t.equal( isNegativeZerof( v ), true, 'returns -0' );

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

@@ -25,6 +25,9 @@ var tape = require( 'tape' );
 var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var abs = require( '@stdlib/math/base/special/abs' );
 var EPS = require( '@stdlib/constants/float32/eps' );
+var PINF = require( '@stdlib/constants/float32/pinf' );
+var NINF = require( '@stdlib/constants/float32/ninf' );
+var HALF_PI = require( '@stdlib/constants/float32/half-pi' );
 var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' );
 var isNegativeZerof = require( '@stdlib/math/base/assert/is-negative-zerof' );
 var isPositiveZerof = require( '@stdlib/math/base/assert/is-positive-zerof' );
@@ -408,6 +411,18 @@ tape( 'the function returns `NaN` if provided `NaN`', opts, function test( t ) {
 	t.end();
 });
 
+tape( 'the function returns `pi/2` if provided `+infinity`', opts, function test( t ) {
+	var v = atanf( PINF );
+	t.equal( v, HALF_PI, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `-pi/2` if provided `-infinity`', opts, function test( t ) {
+	var v = atanf( NINF );
+	t.equal( v, -HALF_PI, 'returns expected value' );
+	t.end();
+});
+
 tape( 'the function returns `-0` if provided `-0`', opts, function test( t ) {
 	var v = atanf( -0.0 );
 	t.equal( isNegativeZerof( v ), true, 'returns -0' );