test: add test case for infinity handling

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---

Author: anandkaranubc

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

@@ -115,8 +115,8 @@ tape( 'if provided `90.0`, the function returns `Infinity`', function test( t )
 	t.end();
 });
 
-tape( 'if provided `180.0`, the function returns `0`', function test( t ) {
-	var v = tand( 180.0 );
-	t.equal( v, 0.0, 'returns expected value' );
+tape( 'if provided `-90.0`, the function returns `-Infinity`', function test( t ) {
+	var v = tand( -90.0 );
+	t.equal( v, NINF, 'returns expected value' );
 	t.end();
 });

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

@@ -124,8 +124,8 @@ tape( 'if provided `90.0`, the function returns `Infinity`', opts, function test
 	t.end();
 });
 
-tape( 'if provided `180.0`, the function returns `0`', opts, function test( t ) {
-	var v = tand( 180.0 );
-	t.equal( v, 0.0, 'returns expected value' );
+tape( 'if provided `-90.0`, the function returns `-Infinity`', opts, function test( t ) {
+	var v = tand( -90.0 );
+	t.equal( v, NINF, 'returns expected value' );
 	t.end();
 });