fix: add more tests to fix code coverage

Author: steff456

lib/node_modules/@stdlib/string/base/reverse-code-point/test/test.js

@@ -73,5 +73,8 @@ tape( 'the function reverses the Unicode code point of a provided string (surrog
 	out = reverse( 'foo\uD834bar\uDF06baz' );
 	t.strictEqual( out, 'zab\uDF06rab\uD834oof', 'returns expected value' );
 
+	out = reverse( 'foo\uD834bar\uDF06\uD834' );
+	t.strictEqual( out, '\uD834\uDF06rab\uD834oof', 'returns expected value' );
+
 	t.end();
 });