refactor: use helper functions for zero checks

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---

Author: anandkaranubc

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

@@ -25,6 +25,7 @@ var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var randu = require( '@stdlib/random/base/randu' );
 var abs = require( '@stdlib/math/base/special/abs' );
 var EPS = require( '@stdlib/constants/float64/eps' );
+var isPositiveZero = require( '@stdlib/assert/is-positive-zero' );
 var acos = require( './../lib' );
 
 
@@ -142,7 +143,6 @@ tape( 'the function returns `NaN` if provided a value greater than `+1`', functi
 });
 
 tape( 'the function returns `0` if provided `1`', function test( t ) {
-	var v = acos( 1.0 );
-	t.equal( v, 0.0, 'returns expected value' );
+	t.equal( isPositiveZero( acos( 1.0 ) ), true, 'returns expected value' );
 	t.end();
 });

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

@@ -27,6 +27,7 @@ var randu = require( '@stdlib/random/base/randu' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 var abs = require( '@stdlib/math/base/special/abs' );
 var EPS = require( '@stdlib/constants/float64/eps' );
+var isPositiveZero = require( '@stdlib/assert/is-positive-zero' );
 
 
 // FIXTURES //
@@ -151,7 +152,6 @@ tape( 'the function returns `NaN` if provided a value greater than `+1`', opts,
 });
 
 tape( 'the function returns `0` if provided `1`', opts, function test( t ) {
-	var v = acos( 1.0 );
-	t.equal( v, 0.0, 'returns expected value' );
+	t.equal( isPositiveZero( acos( 1.0 ) ), true, 'returns expected value' );
 	t.end();
 });

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

@@ -25,6 +25,7 @@ var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var randu = require( '@stdlib/random/base/randu' );
 var EPS = require( '@stdlib/constants/float64/eps' );
 var abs = require( '@stdlib/math/base/special/abs' );
+var isPositiveZero = require( '@stdlib/assert/is-positive-zero' );
 var acosh = require( './../lib' );
 
 
@@ -158,7 +159,6 @@ tape( 'the function returns `NaN` if provided value less than `1`', function tes
 });
 
 tape( 'the function returns `0` if provided `1`', function test( t ) {
-	var v = acosh( 1.0 );
-	t.equal( v, 0.0, 'returns expected value' );
+	t.equal( isPositiveZero( acosh( 1.0 ) ), true, 'returns expected value' );
 	t.end();
 });

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

@@ -26,6 +26,7 @@ var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var randu = require( '@stdlib/random/base/randu' );
 var EPS = require( '@stdlib/constants/float64/eps' );
 var abs = require( '@stdlib/math/base/special/abs' );
+var isPositiveZero = require( '@stdlib/assert/is-positive-zero' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 
 
@@ -167,7 +168,6 @@ tape( 'the function returns `NaN` if provided value less than `1`', opts, functi
 });
 
 tape( 'the function returns `0` if provided `1`', opts, function test( t ) {
-	var v = acosh( 1.0 );
-	t.equal( v, 0.0, 'returns expected value' );
+	t.equal( isPositiveZero( acosh( 1.0 ) ), true, 'returns expected value' );
 	t.end();
 });