fix tests

Author: mayank1513

lib/esbuild-plugin-react18-css-example/src/client/star-me/star-me.test.tsx

@@ -21,7 +21,7 @@ describe("star-me", () => {
     render(
       <StarMe className={className} gitHubUrl="https://github.com/mayank1513/turborepo-template" />,
     );
-    expect(screen.getByTestId("star-me-h1").className).toBe(className);
+    expect(screen.getByTestId("star-me-h1").className).toContain(className);
   });
 
   test("test popup", ({ expect }) => {

lib/esbuild-plugin-react18-css-example/src/client/star-me/star-me.tsx

@@ -21,7 +21,7 @@ export function StarMe({ gitHubUrl, onClick, children, ...props }: StarMeProps)
       onClick={starMe}
       type="button"
       {...props}
-      className={styles.starMe}>
+      className={[styles.starMe, props.className ?? ""].join(" ")}>
       {children || "Star Me"}
     </button>
   );