test: add tests for IEEE 754-2019 compliance

---
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---

Author: anandkaranubc

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

@@ -72,6 +72,21 @@ tape( 'if provided an integer, the function returns `+-0`', function test( t ) {
 	t.end();
 });
 
+tape( 'the function is odd', function test( t ) {
+	var expected;
+	var x;
+	var y;
+	var i;
+
+	x = decimals.x;
+	for ( i = 0; i < x.length; i++ ) {
+		y = sinpi( -x[i] );
+		expected = -sinpi( x[i] );
+		t.equal( y, expected, 'returns '+expected );
+	}
+	t.end();
+});
+
 tape( 'the function computes `sin(πx)`', function test( t ) {
 	var expected;
 	var delta;

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

@@ -81,6 +81,21 @@ tape( 'if provided an integer, the function returns `+-0`', opts, function test(
 	t.end();
 });
 
+tape( 'the function is odd', opts, function test( t ) {
+	var expected;
+	var x;
+	var y;
+	var i;
+
+	x = decimals.x;
+	for ( i = 0; i < x.length; i++ ) {
+		y = sinpi( -x[i] );
+		expected = -sinpi( x[i] );
+		t.equal( y, expected, 'returns '+expected );
+	}
+	t.end();
+});
+
 tape( 'the function computes `sin(πx)`', opts, function test( t ) {
 	var expected;
 	var delta;