add unit test for #424

test/generator/samples/attribute-prefer-expression/_config.js

@@ -0,0 +1,19 @@
+export default {
+	'skip-ssr': true,
+
+	data: {
+		foo: false
+	},
+
+	test ( assert, component, target ) {
+		const inputs = target.querySelectorAll( 'input' );
+
+		assert.ok( inputs[0].checked );
+		assert.ok( !inputs[1].checked );
+
+		component.set( { foo: true } );
+
+		assert.ok( !inputs[0].checked );
+		assert.ok( inputs[1].checked );
+	}
+};

test/generator/samples/attribute-prefer-expression/main.html

@@ -0,0 +1,2 @@
+<input type='radio' bind:group='foo' value='{{false}}'>
+<input type='radio' bind:group='foo' value='{{true}}'>