add test for reactive_store_subscriptions

test/js/samples/component-store-file-invalidate/expected.js

@@ -0,0 +1,46 @@
+/* generated by Svelte vX.Y.Z */
+import {
+	SvelteComponent,
+	component_subscribe,
+	init,
+	noop,
+	safe_not_equal,
+	set_store_value
+} from "svelte/internal";
+import { count } from "./store.js";
+
+function create_fragment(ctx) {
+	return {
+		c: noop,
+		m: noop,
+		p: noop,
+		i: noop,
+		o: noop,
+		d: noop
+	};
+}
+
+function instance($$self, $$props, $$invalidate) {
+	let $count;
+
+	component_subscribe($$self, count, $$value => $$invalidate('$count', $count = $$value));
+
+	function increment() {
+		set_store_value(count, $count++, $count);
+	}
+
+	return { increment };
+}
+
+class Component extends SvelteComponent {
+	constructor(options) {
+		super();
+		init(this, options, instance, create_fragment, safe_not_equal, ["increment"]);
+	}
+
+	get increment() {
+		return this.$$.ctx.increment;
+	}
+}
+
+export default Component;

test/js/samples/component-store-file-invalidate/input.svelte

@@ -0,0 +1,7 @@
+<script>
+	import { count } from './store.js';
+
+	export function increment() {
+		$count++;
+	}
+</script>

test/js/samples/component-store-file-invalidate/store.js

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+import { writable } from '../../../../store';
+
+export const count = writable(0);