Adds NextLink legacyBehavior test (#1959)

Author: TheSonOfThomp

packages/button/src/Button/Button.spec.tsx

@@ -146,7 +146,24 @@ describe('packages/button', () => {
     test(`renders a when passing in a NextJS Link wrapper`, () => {
       // eslint-disable-next-line react/prop-types
       const Linker = ({ href, children, ...props }: any) => (
-        <NextLink href={href}>
+        <NextLink href={href} {...props}>
+          {children}
+        </NextLink>
+      );
+
+      const { container, button } = renderButton({
+        href: 'https://mongodb.design',
+        as: Linker,
+      });
+
+      expect(container.querySelector('button')).not.toBeInTheDocument();
+      expect(button.tagName.toLowerCase()).toBe('a');
+    });
+
+    test(`renders a when passing in a legacy NextJS Link wrapper`, () => {
+      // eslint-disable-next-line react/prop-types
+      const Linker = ({ href, children, ...props }: any) => (
+        <NextLink legacyBehavior href={href}>
           <a {...props}>{children}</a>
         </NextLink>
       );