Method checkImage

tools/testmc/main.js:75–79

(checksum, message)

	}
	animateColors(clut) {}
	checkImage(checksum, message) {
		delete this.checksum;
		this.doIdle();
		assert.sameValue(checksum, this.checksum, message ?? "image mismatch");
	}
	doIdle() {
		this.context.onIdle();
		const promises = this.#promises;