fix(shallow): correctly stub anonymous components

src/stubs.ts

@@ -172,11 +172,6 @@ export function stubComponents(
       const registeredName = getComponentRegisteredName(instance, type)
       const componentName = type['name'] || type['displayName']
 
-      // No name found?
-      if (!registeredName && !componentName) {
-        return renderStubDefaultSlot || !shallow ? args : ['stub']
-      }
-
       let stub = null
       let name = null
 

tests/mountingOptions/global.stubs.spec.ts

@@ -670,4 +670,28 @@ describe('mounting options: stubs', () => {
       )
     })
   })
+
+  it('renders stub for anonymous component when using shallow mount', () => {
+    const AnonymousComponent = defineComponent({
+      template: `<div class="original"><slot></slot></div>`
+    })
+
+    const WrapperComponent = defineComponent({
+      computed: {
+        cmp() {
+          return AnonymousComponent
+        }
+      },
+      template: `<component :is="cmp">test</component>`
+    })
+
+    const wrapper = mount(WrapperComponent, {
+      shallow: true,
+      global: {
+        renderStubDefaultSlot: true
+      }
+    })
+
+    expect(wrapper.html()).toBe('<stub>test</stub>')
+  })
 })