Add tests for <meta method>

test/components/meta/method/bo-arguments.js

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+await self.yozo.register('./bo-arguments.yz');
+const element = document.createElement('reverser-arguments');
+document.body.append(element);
+
+element.textContent = 'hello world';
+
+assert(element.textContent == 'hello world');
+
+element.reverse('before - ', ' - after');
+
+assert(element.textContent == 'before - dlrow olleh - after');

test/components/meta/method/bo-arguments.yz

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+<title>reverser-arguments</title>
+<meta method="reverse">
+<script>
+$.reverse = (before, after) => {
+	const text = this.textContent;
+	const reversed = [...text].reverse().join('');
+	this.textContent = `${before}${reversed}${after}`;
+};
+</script>

test/components/meta/method/bo-binding.js

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+await self.yozo.register('./bo-binding.yz');
+const element = document.createElement('reverser-binding');
+document.body.append(element);
+
+element.textContent = 'hello world';
+
+assert(element.textContent == 'hello world');
+
+element.reverse();
+
+assert(element.textContent == 'dlrow olleh');

test/components/meta/method/bo-binding.yz

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+<title>reverser-binding</title>
+<meta method="reverse">
+<script>
+$.reverse = () => {
+	const text = this.textContent;
+	this.textContent = [...text].reverse().join('');
+};
+</script>

test/components/meta/method/bo-readonly.js

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+await self.yozo.register('./bo-readonly.yz');
+const element = document.createElement('reverser-readonly');
+document.body.append(element);
+element.textContent = 'hello world';
+
+let threw = false;
+try {
+	element.reverse = () => element.textContent = 'foo';
+} catch {
+	threw = true;
+}
+
+assert(threw);
+
+element.reverse();
+
+assert(element.textContent == 'dlrow olleh');

test/components/meta/method/bo-readonly.yz

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+<title>reverser-readonly</title>
+<meta method="reverse">
+<script>
+$.reverse = () => {
+	const text = this.textContent;
+	this.textContent = [...text].reverse().join('');
+};
+</script>