test: add tests for IEEE 754-2019 compliance

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
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    status: passed
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    status: passed
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  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: anandkaranubc

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

@@ -26,6 +26,8 @@ var abs = require( '@stdlib/math/base/special/abs' );
 var EPS = require( '@stdlib/constants/float64/eps' );
 var PINF = require( '@stdlib/constants/float64/pinf' );
 var NINF = require( '@stdlib/constants/float64/ninf' );
+var isPositiveZero = require( '@stdlib/assert/is-positive-zero' );
+var isNegativeZero = require( '@stdlib/assert/is-negative-zero' );
 var tand = require( './../lib' );
 
 
@@ -120,3 +122,15 @@ tape( 'if provided `-90.0`, the function returns `-Infinity`', function test( t
 	t.equal( v, NINF, 'returns expected value' );
 	t.end();
 });
+
+tape( 'the function returns `-0` if provided `-0`', function test( t ) {
+	var v = tand( -0.0 );
+	t.strictEqual( isNegativeZero( v ), true, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `+0` if provided `+0`', function test( t ) {
+	var v = tand( 0.0 );
+	t.strictEqual( isPositiveZero( v ), true, 'returns expected value' );
+	t.end();
+});

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

@@ -27,6 +27,8 @@ var abs = require( '@stdlib/math/base/special/abs' );
 var EPS = require( '@stdlib/constants/float64/eps' );
 var PINF = require( '@stdlib/constants/float64/pinf' );
 var NINF = require( '@stdlib/constants/float64/ninf' );
+var isPositiveZero = require( '@stdlib/assert/is-positive-zero' );
+var isNegativeZero = require( '@stdlib/assert/is-negative-zero' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 
 
@@ -129,3 +131,15 @@ tape( 'if provided `-90.0`, the function returns `-Infinity`', opts, function te
 	t.equal( v, NINF, 'returns expected value' );
 	t.end();
 });
+
+tape( 'the function returns `-0` if provided `-0`', opts, function test( t ) {
+	var v = tand( -0.0 );
+	t.strictEqual( isNegativeZero( v ), true, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `+0` if provided `+0`', opts, function test( t ) {
+	var v = tand( 0.0 );
+	t.strictEqual( isPositiveZero( v ), true, 'returns expected value' );
+	t.end();
+});