add test of $capture_state & $inject_state behaviour

test/js/samples/capture-inject-state/_config.js

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+export default {
+	options: {
+		dev: true
+	}
+};

test/js/samples/capture-inject-state/expected.js

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+/* generated by Svelte vX.Y.Z */
+import {
+	SvelteComponentDev,
+	add_location,
+	append_dev,
+	detach_dev,
+	dispatch_dev,
+	element,
+	init,
+	insert_dev,
+	noop,
+	safe_not_equal,
+	set_data_dev,
+	space,
+	subscribe,
+	text,
+	validate_store
+} from "svelte/internal";
+
+const file = undefined;
+
+function create_fragment(ctx) {
+	let p;
+	let t0;
+	let t1;
+	let t2;
+	let t3;
+	let t4;
+	let t5;
+	let t6;
+
+	const block = {
+		c: function create() {
+			p = element("p");
+			t0 = text(/*$prop*/ ctx[1]);
+			t1 = space();
+			t2 = text(/*realName*/ ctx[0]);
+			t3 = space();
+			t4 = text(/*local*/ ctx[2]);
+			t5 = space();
+			t6 = text(priv);
+			add_location(p, file, 11, 0, 204);
+		},
+		l: function claim(nodes) {
+			throw new Error("options.hydrate only works if the component was compiled with the `hydratable: true` option");
+		},
+		m: function mount(target, anchor) {
+			insert_dev(target, p, anchor);
+			append_dev(p, t0);
+			append_dev(p, t1);
+			append_dev(p, t2);
+			append_dev(p, t3);
+			append_dev(p, t4);
+			append_dev(p, t5);
+			append_dev(p, t6);
+		},
+		p: function update(ctx, [dirty]) {
+			if (dirty & /*$prop*/ 2) set_data_dev(t0, /*$prop*/ ctx[1]);
+			if (dirty & /*realName*/ 1) set_data_dev(t2, /*realName*/ ctx[0]);
+		},
+		i: noop,
+		o: noop,
+		d: function destroy(detaching) {
+			if (detaching) detach_dev(p);
+		}
+	};
+
+	dispatch_dev("SvelteRegisterBlock", {
+		block,
+		id: create_fragment.name,
+		type: "component",
+		source: "",
+		ctx
+	});
+
+	return block;
+}
+
+const priv = "priv";
+
+function instance($$self, $$props, $$invalidate) {
+	let $prop,
+		$$unsubscribe_prop = noop,
+		$$subscribe_prop = () => ($$unsubscribe_prop(), $$unsubscribe_prop = subscribe(prop, $$value => $$invalidate(1, $prop = $$value)), prop);
+
+	$$self.$$.on_destroy.push(() => $$unsubscribe_prop());
+	let { prop } = $$props;
+	validate_store(prop, "prop");
+	$$subscribe_prop();
+	let { alias: realName } = $$props;
+	let local;
+	const writable_props = ["prop", "alias"];
+
+	Object.keys($$props).forEach(key => {
+		if (!~writable_props.indexOf(key) && key.slice(0, 2) !== "$$") console.warn(`<Component> was created with unknown prop '${key}'`);
+	});
+
+	$$self.$set = $$props => {
+		if ("prop" in $$props) $$subscribe_prop($$invalidate(3, prop = $$props.prop));
+		if ("alias" in $$props) $$invalidate(0, realName = $$props.alias);
+	};
+
+	$$self.$capture_state = ({ props: $p = true, local: $l = true } = {}) => ({
+		...$p && ({ prop, realName }),
+		...$l && ({ local })
+	});
+
+	$$self.$inject_state = $$props => {
+		if ("prop" in $$props) $$subscribe_prop($$invalidate(3, prop = $$props.prop));
+		if ("realName" in $$props) $$invalidate(0, realName = $$props.realName);
+		if ("local" in $$props) $$invalidate(2, local = $$props.local);
+	};
+
+	return [realName, $prop, local, prop];
+}
+
+class Component extends SvelteComponentDev {
+	constructor(options) {
+		super(options);
+		init(this, options, instance, create_fragment, safe_not_equal, { prop: 3, alias: 0 });
+
+		dispatch_dev("SvelteRegisterComponent", {
+			component: this,
+			tagName: "Component",
+			options,
+			id: create_fragment.name
+		});
+
+		const { ctx } = this.$$;
+		const props = options.props || ({});
+
+		if (/*prop*/ ctx[3] === undefined && !("prop" in props)) {
+			console.warn("<Component> was created without expected prop 'prop'");
+		}
+
+		if (/*realName*/ ctx[0] === undefined && !("alias" in props)) {
+			console.warn("<Component> was created without expected prop 'alias'");
+		}
+	}
+
+	get prop() {
+		throw new Error("<Component>: Props cannot be read directly from the component instance unless compiling with 'accessors: true' or '<svelte:options accessors/>'");
+	}
+
+	set prop(value) {
+		throw new Error("<Component>: Props cannot be set directly on the component instance unless compiling with 'accessors: true' or '<svelte:options accessors/>'");
+	}
+
+	get alias() {
+		throw new Error("<Component>: Props cannot be read directly from the component instance unless compiling with 'accessors: true' or '<svelte:options accessors/>'");
+	}
+
+	set alias(value) {
+		throw new Error("<Component>: Props cannot be set directly on the component instance unless compiling with 'accessors: true' or '<svelte:options accessors/>'");
+	}
+}
+
+export default Component;

test/js/samples/capture-inject-state/input.svelte

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+<script>
+  export let prop;
+
+  let realName;
+  export { realName as alias };
+
+  let local;
+
+  const priv = 'priv';
+</script>
+<!-- NOTE $prop ensures store subscriptions are not part of captured state -->
+<p>{$prop} {realName} {local} {priv}</p>