diff --git a/packages/next/__tests__/moment.spec.ts b/packages/next/__tests__/moment.spec.ts
index f5ba8ba64f5..e1e8c1388d0 100644
--- a/packages/next/__tests__/moment.spec.ts
+++ b/packages/next/__tests__/moment.spec.ts
@@ -8,6 +8,7 @@ test('momentable is usable', () => {
       moment.isMoment(item)
     )
   ).toBe(true)
+  expect(momentable(0)).toBe(0)
 })
 
 test('formatMomentValue is usable', () => {
diff --git a/packages/reactive/src/__tests__/externals.spec.ts b/packages/reactive/src/__tests__/externals.spec.ts
index 2dc35b40f10..8f33d3d37ff 100644
--- a/packages/reactive/src/__tests__/externals.spec.ts
+++ b/packages/reactive/src/__tests__/externals.spec.ts
@@ -74,6 +74,11 @@ describe('mark operation', () => {
     const obs = observable<any>(markObservable(markRaw({ aa: 111 })))
     expect(isObservable(obs)).toBe(false)
   })
+
+  test('function marked as observable should NOT be observable', () => {
+    const obs = observable<any>(markObservable(() => {}))
+    expect(isObservable(obs)).toBe(false)
+  })
 })
 
 test('recursive references tojs', () => {
@@ -82,4 +87,7 @@ test('recursive references tojs', () => {
   const obs = observable<any>(obj)
   obs.obs = obs
   expect(toJS(obs)).toBeTruthy()
+
+  const arrObs = observable([{ aa: 1 }, { bb: 2 }, { cc: 3 }])
+  expect(toJS(arrObs)).toEqual([{ aa: 1 }, { bb: 2 }, { cc: 3 }])
 })
diff --git a/packages/shared/src/__tests__/index.spec.ts b/packages/shared/src/__tests__/index.spec.ts
index ab9660a8c97..03989fafd30 100644
--- a/packages/shared/src/__tests__/index.spec.ts
+++ b/packages/shared/src/__tests__/index.spec.ts
@@ -20,7 +20,16 @@ import { stringLength } from '../string'
 import { Subscribable } from '../subscribable'
 import { lazyMerge, merge } from '../merge'
 import { instOf } from '../instanceof'
-import { isFn, isHTMLElement, isNumberLike, isReactElement } from '../checkers'
+import {
+  isFn,
+  isHTMLElement,
+  isNumberLike,
+  isReactElement,
+  isMap,
+  isWeakMap,
+  isWeakSet,
+  isSet,
+} from '../checkers'
 import { defaults } from '../defaults'
 import { applyMiddleware } from '../middleware'
 
@@ -530,6 +539,20 @@ describe('types', () => {
   test('isHTMLElement', () => {
     expect(isHTMLElement(document.createElement('div'))).toBeTruthy()
   })
+  test('isMap', () => {
+    expect(isMap(new Map())).toBeTruthy()
+  })
+  test('isSet', () => {
+    expect(isSet(new Set())).toBeTruthy()
+  })
+  test('isWeakMap', () => {
+    expect(isWeakMap(new WeakMap())).toBeTruthy()
+    expect(isWeakMap(new Map())).toBeFalsy()
+  })
+  test('isWeakSet', () => {
+    expect(isWeakSet(new WeakSet())).toBeTruthy()
+    expect(isWeakSet(new Set())).toBeFalsy()
+  })
 })
 
 describe('merge', () => {
diff --git a/packages/validator/src/__tests__/validator.spec.ts b/packages/validator/src/__tests__/validator.spec.ts
index 27399d1b317..45ebf5340a8 100644
--- a/packages/validator/src/__tests__/validator.spec.ts
+++ b/packages/validator/src/__tests__/validator.spec.ts
@@ -203,6 +203,7 @@ test('max/maxItems/maxLength/minItems/minLength/min/maximum/exclusiveMaximum/min
   hasError(await validate({ aa: 1, bb: 2, cc: 3 }, { maxProperties: 2 }))
   noError(await validate({ aa: 1, cc: 3 }, { maxProperties: 2 }))
   hasError(await validate({ aa: 1 }, { minProperties: 2 }))
+  noError(await validate({ aa: 1, bb: 2, cc: 3 }, { minProperties: 2 }))
   noError(await validate({ aa: 1, cc: 3 }, { maxProperties: 2 }))
 })