u-boot/tools/binman/test/122_entry_extend_twice.dts

/dts-v1/;

/ {
	#address-cells = <1>;
	#size-cells = <1>;

	binman {
		_testing {
			bad-update-contents;
			bad-update-contents-twice;
		};

		u-boot {
		};

		_testing2 {
			type = "_testing";
			bad-update-contents;
		};
	};
};