diff --git a/packages/core/__tests__/inheritance.spec.ts b/packages/core/__tests__/inheritance.spec.ts
index 09dc4bd7..c3c68d1d 100644
--- a/packages/core/__tests__/inheritance.spec.ts
+++ b/packages/core/__tests__/inheritance.spec.ts
@@ -1,4 +1,13 @@
-import { Component, createInstance } from '@vue/renderer-test'
+import {
+  Component,
+  observable,
+  h,
+  nextTick,
+  KeepAlive,
+  ComponentPropsOptions,
+  ComponentWatchOptions
+} from '@vue/core'
+import { createInstance, renderIntsance } from '@vue/renderer-test'
 
 describe('class inheritance', () => {
   it('should merge data', () => {
@@ -32,13 +41,251 @@ describe('class inheritance', () => {
     expect(child.qux).toBe(4)
   })
 
-  it('should merge props', () => {})
+  it('should merge props', () => {
+    class Base extends Component {
+      static props: ComponentPropsOptions = {
+        foo: Number
+      }
+    }
 
-  it('should merge lifecycle hooks', () => {})
+    class Child extends Base {
+      foo: number
+      bar: number
+      $props: { foo: number; bar: number }
+      static props: ComponentPropsOptions = {
+        bar: Number
+      }
+    }
 
-  it('should merge watchers', () => {})
+    const child = createInstance(Child, {
+      foo: 1,
+      bar: 2
+    })
 
-  it('should inherit methods', () => {})
+    expect(child.foo).toBe(1)
+    expect(child.bar).toBe(2)
+    expect(child.$props.foo).toBe(1)
+    expect(child.$props.bar).toBe(2)
+  })
 
-  it('should inherit computed properties', () => {})
+  it('should merge lifecycle hooks', async () => {
+    const calls: string[] = []
+    const state = observable({ ok: true })
+
+    class Base extends Component {
+      beforeCreate() {
+        calls.push('base beforeCreate')
+      }
+      created() {
+        calls.push('base created')
+      }
+      beforeMount() {
+        calls.push('base beforeMount')
+      }
+      mounted() {
+        calls.push('base mounted')
+      }
+      beforeUpdate() {
+        calls.push('base beforeUpdate')
+      }
+      updated() {
+        calls.push('base updated')
+      }
+      beforeUnmount() {
+        calls.push('base beforeUnmount')
+      }
+      unmounted() {
+        calls.push('base unmounted')
+      }
+    }
+
+    class Child extends Base {
+      beforeCreate() {
+        calls.push('child beforeCreate')
+      }
+      created() {
+        calls.push('child created')
+      }
+      beforeMount() {
+        calls.push('child beforeMount')
+      }
+      mounted() {
+        calls.push('child mounted')
+      }
+      beforeUpdate() {
+        calls.push('child beforeUpdate')
+      }
+      updated() {
+        calls.push('child updated')
+      }
+      beforeUnmount() {
+        calls.push('child beforeUnmount')
+      }
+      unmounted() {
+        calls.push('child unmounted')
+      }
+      render() {
+        return state.ok ? 'foo' : 'bar'
+      }
+    }
+
+    class Container extends Component {
+      show = true
+      render() {
+        return this.show ? h(Child) : null
+      }
+    }
+
+    const container = renderIntsance(Container)
+    expect(calls).toEqual([
+      'base beforeCreate',
+      'child beforeCreate',
+      'base created',
+      'child created',
+      'base beforeMount',
+      'child beforeMount',
+      'base mounted',
+      'child mounted'
+    ])
+
+    calls.length = 0
+    state.ok = false
+    await nextTick()
+    expect(calls).toEqual([
+      'base beforeUpdate',
+      'child beforeUpdate',
+      'base updated',
+      'child updated'
+    ])
+
+    calls.length = 0
+    container.show = false
+    await nextTick()
+    expect(calls).toEqual([
+      'base beforeUnmount',
+      'child beforeUnmount',
+      'base unmounted',
+      'child unmounted'
+    ])
+  })
+
+  it('should merge lifecycle hooks (activated/deactivated)', async () => {
+    const calls: string[] = []
+
+    class Base extends Component {
+      activated() {
+        calls.push('base activated')
+      }
+      deactivated() {
+        calls.push('base deactivated')
+      }
+    }
+
+    class Child extends Base {
+      activated() {
+        calls.push('child activated')
+      }
+      deactivated() {
+        calls.push('child deactivated')
+      }
+      render() {
+        return 'foo'
+      }
+    }
+
+    class Container extends Component {
+      ok = true
+      render() {
+        return h(KeepAlive, this.ok ? h(Child) : null)
+      }
+    }
+
+    const container = renderIntsance(Container)
+    expect(container.$el.text).toBe('foo')
+
+    container.ok = false
+    await nextTick()
+    expect(container.$el.text).toBe('')
+    expect(calls).toEqual(['base deactivated', 'child deactivated'])
+
+    calls.length = 0
+    container.ok = true
+    await nextTick()
+    expect(container.$el.text).toBe('foo')
+    expect(calls).toEqual(['base activated', 'child activated'])
+  })
+
+  it('should merge watchers', async () => {
+    const fooCallback = jest.fn()
+    const barCallback = jest.fn()
+
+    class Base extends Component {
+      static watch: ComponentWatchOptions = {
+        foo: fooCallback
+      }
+    }
+
+    class Child extends Base {
+      foo = 1
+      bar = 2
+      static watch: ComponentWatchOptions = {
+        bar: barCallback
+      }
+    }
+
+    const child = createInstance(Child)
+    child.foo = 2
+    await nextTick()
+    expect(fooCallback).toHaveBeenCalledWith(2, 1)
+    child.bar = 3
+    await nextTick()
+    expect(barCallback).toHaveBeenCalledWith(3, 2)
+  })
+
+  it('should inherit methods', () => {
+    const fooCallback = jest.fn()
+    const barCallback = jest.fn()
+
+    class Base extends Component {
+      foo() {
+        fooCallback()
+      }
+    }
+
+    class Child extends Base {
+      bar() {
+        barCallback()
+      }
+    }
+
+    const child = createInstance(Child)
+    child.foo()
+    child.bar()
+    expect(fooCallback).toHaveBeenCalled()
+    expect(barCallback).toHaveBeenCalled()
+  })
+
+  it('should inherit computed properties', () => {
+    class Base extends Component {
+      a = 1
+      get foo() {
+        return this.a + 1
+      }
+    }
+
+    class Child extends Base {
+      b = 1
+      get bar() {
+        return this.b + this.foo + 1
+      }
+    }
+
+    const child = createInstance(Child)
+    expect(child.foo).toBe(2)
+    expect(child.bar).toBe(4)
+
+    child.a = 2
+    expect(child.foo).toBe(3)
+    expect(child.bar).toBe(5)
+  })
 })