zmk/app/tests/momentary-layer/5-nested-early-key-release/native_posix.keymap

#include <dt-bindings/zmk/keys.h>
#include <behaviors.dtsi>
#include <dt-bindings/zmk/kscan_mock.h>

/ {
	keymap {
		compatible = "zmk,keymap";
		label ="Default keymap";

		default_layer {
			bindings = <
				&none &mo 1
				&none &none>;
		};

		layer_1 {
			bindings = <
				&mo 2 &none
				&none &none>;
		};

		layer_2 {
			bindings = <
				&none &none
				&kp B &none>;
		};
	};
};

&kscan {
	events = <
		ZMK_MOCK_PRESS(0,1,10)
		ZMK_MOCK_PRESS(0,0,10)
		ZMK_MOCK_PRESS(1,0,10)
		ZMK_MOCK_RELEASE(0,1,10)
		ZMK_MOCK_RELEASE(0,0,10)
		ZMK_MOCK_RELEASE(1,0,10)
	>;
};