test: add zeros tests

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---

Author: kgryte

lib/node_modules/@stdlib/blas/ext/base/ssumkbn/test/test.ndarray.js

@@ -21,7 +21,8 @@
 // MODULES //
 
 var tape = require( 'tape' );
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var isPositiveZerof = require( '@stdlib/math/base/assert/is-positive-zerof' );
+var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var Float32Array = require( '@stdlib/array/float32' );
 var ssumkbn = require( './../lib/ndarray.js' );
 
@@ -57,7 +58,7 @@ tape( 'the function calculates the sum of all strided array elements', function
 
 	x = new Float32Array( [ NaN, 4.0 ] );
 	v = ssumkbn( x.length, x, 1, 0 );
-	t.strictEqual( isnan( v ), true, 'returns expected value' );
+	t.strictEqual( isnanf( v ), true, 'returns expected value' );
 
 	x = new Float32Array( [ 1.0, 1.0e38, 1.0, -1.0e38 ] );
 	v = ssumkbn( x.length, x, 1, 0 );
@@ -66,6 +67,23 @@ tape( 'the function calculates the sum of all strided array elements', function
 	t.end();
 });
 
+tape( 'the function does not preserve the sign of zero', function test( t ) {
+	var x;
+	var v;
+
+	x = new Float32Array( [ -0.0, -0.0, -0.0 ] );
+
+	v = ssumkbn( x.length, x, 1, 0 );
+	t.strictEqual( isPositiveZerof( v ), true, 'returns expected value' );
+
+	x = new Float32Array( [ 0.0, -0.0, -0.0 ] );
+
+	v = ssumkbn( x.length, x, 1, 0 );
+	t.strictEqual( isPositiveZerof( v ), true, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'if provided an `N` parameter less than or equal to `0`, the function returns `0.0`', function test( t ) {
 	var x;
 	var v;

lib/node_modules/@stdlib/blas/ext/base/ssumkbn/test/test.ndarray.native.js

@@ -22,7 +22,8 @@
 
 var resolve = require( 'path' ).resolve;
 var tape = require( 'tape' );
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var isPositiveZerof = require( '@stdlib/math/base/assert/is-positive-zerof' );
+var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var Float32Array = require( '@stdlib/array/float32' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 
@@ -66,7 +67,7 @@ tape( 'the function calculates the sum of all strided array elements', opts, fun
 
 	x = new Float32Array( [ NaN, 4.0 ] );
 	v = ssumkbn( x.length, x, 1, 0 );
-	t.strictEqual( isnan( v ), true, 'returns expected value' );
+	t.strictEqual( isnanf( v ), true, 'returns expected value' );
 
 	x = new Float32Array( [ 1.0, 1.0e38, 1.0, -1.0e38 ] );
 	v = ssumkbn( x.length, x, 1, 0 );
@@ -75,6 +76,23 @@ tape( 'the function calculates the sum of all strided array elements', opts, fun
 	t.end();
 });
 
+tape( 'the function does not preserve the sign of zero', opts, function test( t ) {
+	var x;
+	var v;
+
+	x = new Float32Array( [ -0.0, -0.0, -0.0 ] );
+
+	v = ssumkbn( x.length, x, 1, 0 );
+	t.strictEqual( isPositiveZerof( v ), true, 'returns expected value' );
+
+	x = new Float32Array( [ 0.0, -0.0, -0.0 ] );
+
+	v = ssumkbn( x.length, x, 1, 0 );
+	t.strictEqual( isPositiveZerof( v ), true, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'if provided an `N` parameter less than or equal to `0`, the function returns `0.0`', opts, function test( t ) {
 	var x;
 	var v;

lib/node_modules/@stdlib/blas/ext/base/ssumkbn/test/test.ssumkbn.js

@@ -21,7 +21,7 @@
 // MODULES //
 
 var tape = require( 'tape' );
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var Float32Array = require( '@stdlib/array/float32' );
 var ssumkbn = require( './../lib/ssumkbn.js' );
 
@@ -57,7 +57,7 @@ tape( 'the function calculates the sum of all strided array elements', function
 
 	x = new Float32Array( [ NaN, 4.0 ] );
 	v = ssumkbn( x.length, x, 1 );
-	t.strictEqual( isnan( v ), true, 'returns expected value' );
+	t.strictEqual( isnanf( v ), true, 'returns expected value' );
 
 	x = new Float32Array( [ 1.0, 1.0e38, 1.0, -1.0e38 ] );
 	v = ssumkbn( x.length, x, 1 );

lib/node_modules/@stdlib/blas/ext/base/ssumkbn/test/test.ssumkbn.native.js

@@ -22,7 +22,7 @@
 
 var resolve = require( 'path' ).resolve;
 var tape = require( 'tape' );
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var Float32Array = require( '@stdlib/array/float32' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 
@@ -148,7 +148,7 @@ tape( 'the function calculates the sum of all strided array elements', opts, fun
 
 	x = new Float32Array( [ NaN, 4.0 ] );
 	v = ssumkbn( x.length, x, 1 );
-	t.strictEqual( isnan( v ), true, 'returns expected value' );
+	t.strictEqual( isnanf( v ), true, 'returns expected value' );
 
 	x = new Float32Array( [ 1.0, 1.0e38, 1.0, -1.0e38 ] );
 	v = ssumkbn( x.length, x, 1 );