diff --git a/src/utils/type.ts b/src/utils/type.ts
index fb80d4a..461d6b2 100644
--- a/src/utils/type.ts
+++ b/src/utils/type.ts
@@ -1,6 +1,6 @@
 import { Noop } from '../types'
 
-/* istanbul-ignore-next */
+/* istanbul ignore next */
 function isTypeof(target: any, type: string): boolean {
   if (!type) {
     return false
@@ -43,10 +43,6 @@ export function isObject(target: any): target is Record<string, unknown> {
   return isTypeof(target, 'object')
 }
 
-export function isModule(target: any): target is NodeModule {
-  return isTypeof(target, 'module')
-}
-
 export function isArray(target: any): target is Array<any> {
   return isTypeof(target, 'array')
 }
diff --git a/test/utils.spec.ts b/test/utils.spec.ts
new file mode 100644
index 0000000..d71856e
--- /dev/null
+++ b/test/utils.spec.ts
@@ -0,0 +1,127 @@
+import { STORE_NAME_PREFIX } from '../src/common/const'
+import { invariant } from '../src/utils/invariant'
+import { shallowEqual } from '../src/utils/shallowEqual'
+import * as type from '../src/utils/type'
+import * as func from '../src/utils/func'
+
+describe('util test', () => {
+  beforeEach(() => {
+    jest.resetModules()
+  })
+
+  it('should isDev return true when NODE_ENV is development', () => {
+    process.env.NODE_ENV = 'development'
+    // eslint-disable-next-line @typescript-eslint/no-var-requires
+    const env = require('../src/common/env')
+
+    expect(env.isDev).toBeTruthy()
+    expect(env.isProd).toBeFalsy()
+  })
+
+  it('should isProd return true when NODE_ENV is production', () => {
+    process.env.NODE_ENV = 'production'
+    // eslint-disable-next-line @typescript-eslint/no-var-requires
+    const env = require('../src/common/env')
+
+    expect(env.isDev).toBeFalsy()
+    expect(env.isProd).toBeTruthy()
+  })
+
+  it('should noop func return object', () => {
+    expect(func.noop()).toEqual({})
+  })
+
+  it('should identify func return the same value with input', () => {
+    const state = {
+      a: 1,
+      b: {
+        c: 2,
+      },
+    }
+    expect(func.identify(state)).toEqual(state)
+  })
+
+  it('should return correct store name using getStoreName', () => {
+    let count = 1
+    expect(func.getStoreName()).toBe(`${STORE_NAME_PREFIX}/${count}`)
+    count++
+    expect(func.getStoreName()).toBe(`${STORE_NAME_PREFIX}/${count}`)
+    count++
+  })
+
+  it('should not throw error when condition is true', () => {
+    expect(() => invariant(true, 'this is error')).not.toThrow()
+  })
+
+  it('should throw error when condition is false', () => {
+    expect(() => invariant(false, 'this is error')).toThrow('Invariant Failed: this is error')
+
+    jest.isolateModules(() => {
+      process.env.NODE_ENV = 'production'
+
+      // eslint-disable-next-line @typescript-eslint/no-var-requires
+      expect(() => require('../src/utils/invariant').invariant(false, 'this is error')).toThrow(
+        'Invariant Failed'
+      )
+    })
+  })
+
+  it('should return correct result using shallowEqual', () => {
+    expect(shallowEqual(1, 2)).toBeFalsy()
+    expect(shallowEqual(1, 1)).toBeTruthy()
+
+    const o1 = {
+      b: {
+        c: 2,
+      },
+    }
+
+    const o2 = {
+      b: {
+        c: 2,
+      },
+    }
+
+    expect(shallowEqual(o1, o1)).toBeTruthy()
+    expect(shallowEqual(o1, o2)).toBeFalsy()
+
+    const o3 = {
+      a: 1,
+      b: 2,
+    }
+
+    expect(shallowEqual(o1, o3)).toBeFalsy()
+
+    const o4 = {
+      a: 1,
+      b: 2,
+    }
+
+    expect(shallowEqual(o3, o4)).toBeTruthy()
+
+    const o5 = {
+      a: NaN,
+    }
+
+    expect(shallowEqual(o5, { a: NaN })).toBeTruthy()
+    expect(shallowEqual(+0, -0)).toBeFalsy()
+  })
+
+  it('should judge correct type using type', () => {
+    let a
+    expect(type.isUndefined(a)).toBeTruthy()
+
+    const b = null
+    expect(type.isNull(b)).toBeTruthy()
+
+    expect(type.isFunction(() => {})).toBeTruthy()
+    expect(type.isString('dobux')).toBeTruthy()
+
+    async function c() {}
+
+    expect(type.isFunction(c)).toBeTruthy()
+    expect(type.isPromise(c())).toBeTruthy()
+    expect(type.isObject({})).toBeTruthy()
+    expect(type.isArray([])).toBeTruthy()
+  })
+})