Apply formatting suggestion and add tests for object literals and class properties with string keys

- Format destructuring assignment tests on single lines as suggested
- Add test for object literal with string key: ({ "test-key": key })
- Add test for class property with string key: (class { "test-key" = key })

Co-authored-by: sapphi-red <49056869+sapphi-red@users.noreply.github.com>

Author: Copilot

crates/oxc_codegen/tests/integration/js.rs

@@ -227,11 +227,14 @@ fn assignment() {
     test_minify("({ [a.b]: x } = foo);", "({[a.b]:x}=foo);");
 
     test_minify(r#"({"my-key": value} = obj);"#, r#"({"my-key":value}=obj);"#);
-    test_minify(
-        r#"({["computed"]: a, "literal": b} = obj);"#,
-        r#"({["computed"]:a,"literal":b}=obj);"#,
-    );
+    test_minify(r#"({["computed"]: a, "literal": b} = obj);"#, r#"({["computed"]:a,"literal":b}=obj);"#);
     test_minify(r#"let {"test-key": testKey} = obj;"#, r#"let{"test-key":testKey}=obj;"#);
+
+    // Object literals with string keys
+    test_minify(r#"({ "test-key": key });"#, r#"({"test-key":key});"#);
+    
+    // Class properties with string keys
+    test_minify(r#"(class { "test-key" = key });"#, r#"(class{"test-key"=key});"#);
 }
 
 #[test]