test: observer collection tests

packages/observer/__tests__/collections/WeakMap.spec.ts

@@ -0,0 +1,77 @@
+import { observable, autorun, unwrap, isObservable } from '../../src'
+
+describe('observer/collections/WeakMap', () => {
+  test('instanceof', () => {
+    const original = new WeakMap()
+    const observed = observable(original)
+    expect(isObservable(observed)).toBe(true)
+    expect(original instanceof WeakMap).toBe(true)
+    expect(observed instanceof WeakMap).toBe(true)
+  })
+
+  it('should observe mutations', () => {
+    let dummy
+    const key = {}
+    const map = observable(new WeakMap())
+    autorun(() => {
+      dummy = map.get(key)
+    })
+
+    expect(dummy).toBe(undefined)
+    map.set(key, 'value')
+    expect(dummy).toBe('value')
+    map.set(key, 'value2')
+    expect(dummy).toBe('value2')
+    map.delete(key)
+    expect(dummy).toBe(undefined)
+  })
+
+  it('should not observe custom property mutations', () => {
+    let dummy
+    const map: any = observable(new Map())
+    autorun(() => (dummy = map.customProp))
+
+    expect(dummy).toBe(undefined)
+    map.customProp = 'Hello World'
+    expect(dummy).toBe(undefined)
+  })
+
+  it('should not observe non value changing mutations', () => {
+    let dummy
+    const key = {}
+    const map = observable(new Map())
+    const mapSpy = jest.fn(() => (dummy = map.get(key)))
+    autorun(mapSpy)
+
+    expect(dummy).toBe(undefined)
+    expect(mapSpy).toHaveBeenCalledTimes(1)
+    map.set(key, 'value')
+    expect(dummy).toBe('value')
+    expect(mapSpy).toHaveBeenCalledTimes(2)
+    map.set(key, 'value')
+    expect(dummy).toBe('value')
+    expect(mapSpy).toHaveBeenCalledTimes(2)
+    map.delete(key)
+    expect(dummy).toBe(undefined)
+    expect(mapSpy).toHaveBeenCalledTimes(3)
+    map.delete(key)
+    expect(dummy).toBe(undefined)
+    expect(mapSpy).toHaveBeenCalledTimes(3)
+    map.clear()
+    expect(dummy).toBe(undefined)
+    expect(mapSpy).toHaveBeenCalledTimes(3)
+  })
+
+  it('should not observe raw data', () => {
+    let dummy
+    const key = {}
+    const map = observable(new Map())
+    autorun(() => (dummy = unwrap(map).get('key')))
+
+    expect(dummy).toBe(undefined)
+    map.set(key, 'Hello')
+    expect(dummy).toBe(undefined)
+    map.delete(key)
+    expect(dummy).toBe(undefined)
+  })
+})