Add date.test.ts

mobxjs#2080

packages/mobx-state-tree/__tests__/core/date.test.ts

@@ -0,0 +1,58 @@
+import { configure } from "mobx"
+import {
+    onSnapshot,
+    onPatch,
+    applyPatch,
+    applySnapshot,
+    getSnapshot,
+    types,
+    unprotect,
+    isStateTreeNode,
+    SnapshotOut,
+    IJsonPatch,
+    IAnyModelType,
+    detach
+} from "../../src"
+
+const createTestFactories = () => {
+    const Factory = types.model({
+        date: types.Date
+    })
+    return { Factory }
+}
+// === FACTORY TESTS ===
+test("it should create a factory", () => {
+    const { Factory } = createTestFactories()
+    const now = new Date()
+    const snapshot = getSnapshot(Factory.create({ date: now }))
+
+    expect(snapshot).toEqual({ date: now.getTime() })
+})
+
+// === PATCHES TESTS ===
+test("it should emit replace patch for different date", () => {
+    const { Factory } = createTestFactories()
+    const date1 = new Date()
+    const date2 = new Date(date1)
+    date2.setHours(date1.getHours() + 1)
+
+    const doc = Factory.create({ date: date1 })
+    unprotect(doc)
+    let patches: IJsonPatch[] = []
+    onPatch(doc, (patch) => patches.push(patch))
+    doc.date = date2
+    expect(patches).toEqual([{ op: "replace", path: "/date", value: date2.getTime() }])
+})
+
+test("it should not emit replace patch for same date", () => {
+    const { Factory } = createTestFactories()
+    const date1 = new Date()
+    const date2 = new Date(date1)
+
+    const doc = Factory.create({ date: date1 })
+    unprotect(doc)
+    let patches: IJsonPatch[] = []
+    onPatch(doc, (patch) => patches.push(patch))
+    doc.date = date2
+    expect(patches.length).toEqual(0)
+})