add some onstate/onupdate tests

test/runtime/samples/onupdate/_config.js

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+export default {
+	solo: true,
+	'skip-ssr': true,
+
+	data: {
+		value: 'hello!'
+	},
+
+	html: `
+		<p>hello!</p>
+		<p>hello!</p>
+	`,
+
+	test(assert, component, target) {
+		component.set({ value: 'goodbye!' });
+		assert.htmlEqual(target.innerHTML, `
+			<p>goodbye!</p>
+			<p>goodbye!</p>
+		`);
+	}
+};

test/runtime/samples/onupdate/main.html

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+<p ref:a>{{value}}</p>
+<p ref:b></p>
+
+<script>
+	export default {
+		onupdate({ changed, current, previous }) {
+			if (changed.value) {
+				this.refs.b.textContent = this.refs.a.textContent;
+			}
+		}
+	};
+</script>

test/validator/samples/onstate-arrow-no-this/errors.json

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+[]

test/validator/samples/onstate-arrow-no-this/input.html

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+<script>
+	export default {
+		onstate: () => console.log('updating')
+	};
+</script>

test/validator/samples/onstate-arrow-this/errors.json

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+[{
+	"message": "'onstate' should be a function expression, not an arrow function expression",
+	"pos": 29,
+	"loc": {
+		"line": 3,
+		"column": 2
+	},
+	"end": {
+		"line": 5,
+		"column": 3
+	}
+}]

test/validator/samples/onstate-arrow-this/input.html

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+<script>
+	export default {
+		onstate: () => {
+			this.set({ a: 1 });
+		}
+	};
+</script>

test/validator/samples/onupdate-arrow-no-this/errors.json

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+[]

test/validator/samples/onupdate-arrow-no-this/input.html

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+<script>
+	export default {
+		onupdate: () => console.log('updating')
+	};
+</script>

test/validator/samples/onupdate-arrow-this/errors.json

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+[{
+	"message": "'onupdate' should be a function expression, not an arrow function expression",
+	"pos": 29,
+	"loc": {
+		"line": 3,
+		"column": 2
+	},
+	"end": {
+		"line": 5,
+		"column": 3
+	}
+}]

test/validator/samples/onupdate-arrow-this/input.html

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+<script>
+	export default {
+		onupdate: () => {
+			this.set({ a: 1 });
+		}
+	};
+</script>