Add tests related to slot fragments having slots itself

test/runtime/samples/deep-slot-default-forward-fragment-of-slots/Component1.svelte

@@ -0,0 +1,15 @@
+<script>
+	import Component2 from './Component2.svelte';
+</script>
+
+<Component2>
+  <svelte:fragment slot="first">
+	  <slot name="first" />
+	  <slot name="second" />
+  </svelte:fragment>
+  <svelte:fragment slot="second">
+	  <slot name="third" />
+	  <slot name="fourth" />
+	  <slot name="fifth" />
+  </svelte:fragment>
+</Component2>

test/runtime/samples/deep-slot-default-forward-fragment-of-slots/Component2.svelte

@@ -0,0 +1,16 @@
+<script>
+	import Component3 from './Component3.svelte';
+</script>
+
+<Component3>
+  <svelte:fragment slot="first">
+    <slot name="first" />
+  </svelte:fragment>
+  <svelte:fragment slot="second">
+    <slot name="first" />
+    <slot name="second" />
+  </svelte:fragment>
+  <svelte:fragment slot="third">
+    <slot name="second" />
+  </svelte:fragment>
+</Component3>

test/runtime/samples/deep-slot-default-forward-fragment-of-slots/Component3.svelte

@@ -0,0 +1,9 @@
+<script>
+	import Component4 from './Component4.svelte';
+</script>
+
+<Component4>
+	<slot name="first" slot="first" />
+	<slot name="second" slot="second" />
+	<slot name="third" slot="third" />
+</Component4>

test/runtime/samples/deep-slot-default-forward-fragment-of-slots/Component4.svelte

@@ -0,0 +1,3 @@
+<slot name="first">First slot's default text</slot>
+<slot name="second">Second slot's default text</slot>
+<slot name="third">Third slot's default text</slot>

test/runtime/samples/deep-slot-default-forward-fragment-of-slots/_config.js

@@ -0,0 +1,7 @@
+export default {
+	html: `
+		First slot's default text
+		<h3 slot="fourth">Component 1 slot=fourth</h3>
+		<h3 slot="fourth">Component 1 slot=fourth</h3>
+	`
+};

test/runtime/samples/deep-slot-default-forward-fragment-of-slots/main.svelte

@@ -0,0 +1,7 @@
+<script>
+	import Component1 from './Component1.svelte';
+</script>
+
+<Component1>
+  <h3 slot="fourth">Component 1 slot=fourth</h3>
+</Component1>