diff --git a/lib/node_modules/@stdlib/math/base/special/acos/test/test.js b/lib/node_modules/@stdlib/math/base/special/acos/test/test.js
index c3e034c3c74d..8b7d275e69bc 100644
--- a/lib/node_modules/@stdlib/math/base/special/acos/test/test.js
+++ b/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' );
 
 
@@ -140,3 +141,8 @@ tape( 'the function returns `NaN` if provided a value greater than `+1`', functi
 	}
 	t.end();
 });
+
+tape( 'the function returns `0` if provided `1`', function test( t ) {
+	t.equal( isPositiveZero( acos( 1.0 ) ), true, 'returns expected value' );
+	t.end();
+});
diff --git a/lib/node_modules/@stdlib/math/base/special/acos/test/test.native.js b/lib/node_modules/@stdlib/math/base/special/acos/test/test.native.js
index b3f90b231a21..845e516eec3c 100644
--- a/lib/node_modules/@stdlib/math/base/special/acos/test/test.native.js
+++ b/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 //
@@ -149,3 +150,8 @@ tape( 'the function returns `NaN` if provided a value greater than `+1`', opts,
 	}
 	t.end();
 });
+
+tape( 'the function returns `0` if provided `1`', opts, function test( t ) {
+	t.equal( isPositiveZero( acos( 1.0 ) ), true, 'returns expected value' );
+	t.end();
+});
diff --git a/lib/node_modules/@stdlib/math/base/special/acosh/test/test.js b/lib/node_modules/@stdlib/math/base/special/acosh/test/test.js
index 860e59136b75..6ebe9574297e 100644
--- a/lib/node_modules/@stdlib/math/base/special/acosh/test/test.js
+++ b/lib/node_modules/@stdlib/math/base/special/acosh/test/test.js
@@ -26,6 +26,7 @@ var randu = require( '@stdlib/random/base/randu' );
 var EPS = require( '@stdlib/constants/float64/eps' );
 var PINF = require( '@stdlib/constants/float64/pinf' );
 var abs = require( '@stdlib/math/base/special/abs' );
+var isPositiveZero = require( '@stdlib/assert/is-positive-zero' );
 var acosh = require( './../lib' );
 
 
@@ -158,6 +159,11 @@ tape( 'the function returns `NaN` if provided value less than `1`', function tes
 	t.end();
 });
 
+tape( 'the function returns `0` if provided `1`', function test( t ) {
+	t.equal( isPositiveZero( acosh( 1.0 ) ), true, 'returns expected value' );
+	t.end();
+});
+
 tape( 'the function returns `+infinity` if provided `+infinity`', function test( t ) {
 	var v = acosh( PINF );
 	t.equal( v, PINF, 'returns expected value' );
diff --git a/lib/node_modules/@stdlib/math/base/special/acosh/test/test.native.js b/lib/node_modules/@stdlib/math/base/special/acosh/test/test.native.js
index 9622766edf7f..dcb73cca917f 100644
--- a/lib/node_modules/@stdlib/math/base/special/acosh/test/test.native.js
+++ b/lib/node_modules/@stdlib/math/base/special/acosh/test/test.native.js
@@ -27,6 +27,7 @@ var randu = require( '@stdlib/random/base/randu' );
 var PINF = require( '@stdlib/constants/float64/pinf' );
 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' );
 
 
@@ -167,6 +168,11 @@ tape( 'the function returns `NaN` if provided value less than `1`', opts, functi
 	t.end();
 });
 
+tape( 'the function returns `0` if provided `1`', opts, function test( t ) {
+	t.equal( isPositiveZero( acosh( 1.0 ) ), true, 'returns expected value' );
+	t.end();
+});
+
 tape( 'the function returns `+infinity` if provided `+infinity`', opts, function test( t ) {
 	var v = acosh( PINF );
 	t.equal( v, PINF, 'returns expected value' );