Add tests for durationFromNow

packages/string-templates/test/helpers/date.spec.ts

@@ -1,11 +1,15 @@
+import tk from "timekeeper"
 import * as date from "../../src/helpers/date"
 
+const frozenDate = new Date("2025-03-06T11:38:41.000Z")
+tk.freeze(frozenDate)
+
 describe("date helper", () => {
   describe("difference", () => {
     it("should return the difference between two dates", () => {
       const result = date.difference(
-        "2021-01-02T12:34:56.789",
-        "2021-01-01T01:00:00"
+        "2021-01-02T12:34:56.789Z",
+        "2021-01-01T01:00:00.000Z"
       )
       const expected =
         1 * 24 * 60 * 60 * 1000 + // 1 day
@@ -25,4 +29,26 @@ describe("date helper", () => {
       expect(result).toEqual(1)
     })
   })
+
+  describe("durationFromNow", () => {
+    it("should return the difference between two close dates", () => {
+      const result = date.durationFromNow("2025-03-06T11:38:43.000Z")
+      expect(result).toEqual("a few seconds")
+    })
+
+    it("should return the difference between two days hours apart", () => {
+      const result = date.durationFromNow("2025-03-06T01:00:00.000Z")
+      expect(result).toEqual("11 hours")
+    })
+
+    it("accepts days in the past", () => {
+      const result = date.durationFromNow("2025-03-01")
+      expect(result).toEqual("5 days")
+    })
+
+    it("accepts days in the future", () => {
+      const result = date.durationFromNow("2025-03-08")
+      expect(result).toEqual("2 days")
+    })
+  })
 })