Add test

packages/string-templates/src/helpers/date.ts

@@ -134,7 +134,7 @@ export const duration = (str: any, pattern: any, format?: any) => {
   }
 }
 
-export const difference = (from: string, to: string, units: UnitType) => {
+export const difference = (from: string, to: string, units?: UnitType) => {
   const result = dayjs(new Date(from)).diff(dayjs(new Date(to)), units)
   return result
 }

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

@@ -0,0 +1,28 @@
+import * as date from "../../src/helpers/date"
+
+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"
+      )
+      const expected =
+        1 * 24 * 60 * 60 * 1000 + // 1 day
+        11 * 60 * 60 * 1000 + // 11 hours
+        34 * 60 * 1000 + // 34 minutes
+        56 * 1000 + // seconds
+        789 // milliseconds
+      expect(result).toEqual(expected)
+    })
+
+    it("should be able to set the time unit", () => {
+      const result = date.difference(
+        "2021-01-02T12:34:56",
+        "2021-01-01T01:00:00",
+        "days"
+      )
+      expect(result).toEqual(1)
+    })
+  })
+})