diff --git a/test/runtime/index.js b/test/runtime/index.js
index 778f47c0cc..8ec4c5194a 100644
--- a/test/runtime/index.js
+++ b/test/runtime/index.js
@@ -66,6 +66,7 @@ describe("runtime", () => {
 			compileOptions.hydratable = hydrate;
 			compileOptions.dev = config.dev;
 			compileOptions.store = !!config.store;
+			compileOptions.immutable = config.immutable;
 
 			// check that no ES2015+ syntax slipped in
 			if (!config.allowES2015) {
@@ -160,7 +161,8 @@ describe("runtime", () => {
 						target,
 						hydrate,
 						data: config.data,
-						store: (config.store !== true && config.store)
+						store: (config.store !== true && config.store),
+						immutable: config.immutable
 					}, config.options || {});
 
 					const component = new SvelteComponent(options);
diff --git a/test/runtime/samples/immutable-mutable/Nested.html b/test/runtime/samples/immutable-mutable/Nested.html
new file mode 100644
index 0000000000..02278e385e
--- /dev/null
+++ b/test/runtime/samples/immutable-mutable/Nested.html
@@ -0,0 +1,13 @@
+<h3>Called {{count}} times.</h3>
+
+<script>
+  export default {
+    immutable: false,
+    data() {
+      return {
+        count: 0,
+        foo: { bar: 'baz' }
+      };
+    }
+  }
+</script>
\ No newline at end of file
diff --git a/test/runtime/samples/immutable-mutable/_config.js b/test/runtime/samples/immutable-mutable/_config.js
new file mode 100644
index 0000000000..5dab0f239b
--- /dev/null
+++ b/test/runtime/samples/immutable-mutable/_config.js
@@ -0,0 +1,16 @@
+export default {
+	immutable: true,
+	html: `<div><h3>Called 0 times.</h3></div>`,
+
+	test(assert, component, target, window) {
+		var nested = component.refs.nested;
+		nested.observe('foo', foo => {
+			nested.set({ count: nested.get('count') + 1 });
+		});
+
+		assert.htmlEqual(target.innerHTML, `<div><h3>Called 1 times.</h3></div>`);
+
+		nested.set({ foo: nested.get('foo') });
+		assert.htmlEqual(target.innerHTML, `<div><h3>Called 2 times.</h3></div>`);
+	}
+};
diff --git a/test/runtime/samples/immutable-mutable/main.html b/test/runtime/samples/immutable-mutable/main.html
new file mode 100644
index 0000000000..4e36143361
--- /dev/null
+++ b/test/runtime/samples/immutable-mutable/main.html
@@ -0,0 +1,13 @@
+<div>
+  <Nested ref:nested />
+</div>
+
+<script>
+	import Nested from './Nested.html';
+
+	export default {
+		components: {
+			Nested
+		}
+	};
+</script>
diff --git a/test/runtime/samples/immutable-nested/Nested.html b/test/runtime/samples/immutable-nested/Nested.html
new file mode 100644
index 0000000000..05eb9f3fdf
--- /dev/null
+++ b/test/runtime/samples/immutable-nested/Nested.html
@@ -0,0 +1,12 @@
+<h3>Called {{count}} times.</h3>
+
+<script>
+	export default {
+		data() {
+			return {
+				count: 0,
+				foo: { bar: 'baz' }
+			};
+		}
+	}
+</script>
\ No newline at end of file
diff --git a/test/runtime/samples/immutable-nested/_config.js b/test/runtime/samples/immutable-nested/_config.js
new file mode 100644
index 0000000000..541566ce4d
--- /dev/null
+++ b/test/runtime/samples/immutable-nested/_config.js
@@ -0,0 +1,16 @@
+export default {
+	immutable: true,
+	html: `<div><h3>Called 0 times.</h3></div>`,
+
+	test(assert, component, target, window) {
+		var nested = component.refs.nested;
+		nested.observe('foo', foo => {
+			nested.set({ count: nested.get('count') + 1 });
+		});
+
+		assert.htmlEqual(target.innerHTML, `<div><h3>Called 1 times.</h3></div>`);
+
+		nested.set({ foo: nested.get('foo') });
+		assert.htmlEqual(target.innerHTML, `<div><h3>Called 1 times.</h3></div>`);
+	}
+};
diff --git a/test/runtime/samples/immutable-nested/main.html b/test/runtime/samples/immutable-nested/main.html
new file mode 100644
index 0000000000..4e36143361
--- /dev/null
+++ b/test/runtime/samples/immutable-nested/main.html
@@ -0,0 +1,13 @@
+<div>
+  <Nested ref:nested />
+</div>
+
+<script>
+	import Nested from './Nested.html';
+
+	export default {
+		components: {
+			Nested
+		}
+	};
+</script>
diff --git a/test/runtime/samples/immutable-root/_config.js b/test/runtime/samples/immutable-root/_config.js
new file mode 100644
index 0000000000..a862008d7d
--- /dev/null
+++ b/test/runtime/samples/immutable-root/_config.js
@@ -0,0 +1,15 @@
+export default {
+	immutable: true,
+	html: `<div><h3>Called 0 times.</h3></div>`,
+
+	test(assert, component, target, window) {
+		component.observe('foo', foo => {
+			component.set({ count: component.get('count') + 1 });
+		});
+
+		assert.htmlEqual(target.innerHTML, `<div><h3>Called 1 times.</h3></div>`);
+
+		component.set({ foo: component.get('foo') });
+		assert.htmlEqual(target.innerHTML, `<div><h3>Called 1 times.</h3></div>`);
+	}
+};
diff --git a/test/runtime/samples/immutable-root/main.html b/test/runtime/samples/immutable-root/main.html
new file mode 100644
index 0000000000..087f561caf
--- /dev/null
+++ b/test/runtime/samples/immutable-root/main.html
@@ -0,0 +1,14 @@
+<div>
+	<h3>Called {{count}} times.</h3>
+</div>
+
+<script>
+  export default {
+		data() {
+			return {
+				count: 0,
+				foo: { bar: 'baz' }
+			};
+		}
+  }
+</script>
\ No newline at end of file