chore: add getDMReminderMessage tests

src/constants/strings.js

@@ -8,6 +8,7 @@ const NO_ASSIGNED_CHORE =
 const MAYBE_NO_CHORE =
   "Couldn't find your chore. Maybe you need to do `/assign`?";
 const SWAP_FAILED = "Failed to swap for a new chore.";
+const LAST_DAY = "This is the last day";
 
 const strings = {
   USER_HAS_CHORE,
@@ -16,6 +17,7 @@ const strings = {
   NO_ASSIGNED_CHORE,
   SWAP_FAILED,
   MAYBE_NO_CHORE,
+  LAST_DAY,
 };
 
 module.exports = strings;

src/helpers/getDMReminderMessage.js

@@ -1,9 +1,10 @@
+const strings = require("../constants/strings");
 const { getChoreMessage } = require("./getChoreMessage");
 
 exports.getDMReminderMessage = (days, chore) => {
   let timeString = `you have ${days} ${days === 1 ? "day" : "days"}`;
   if (days === 0) {
-    timeString = "This is the last day";
+    timeString = strings.LAST_DAY;
   }
   return `### Reminder: ${timeString} to do your chore.\n${getChoreMessage(
     chore,

src/helpers/getDMReminderMessage.test.js

@@ -0,0 +1,16 @@
+const strings = require("../constants/strings");
+const { getChoreMessage } = require("./getChoreMessage");
+const { getDMReminderMessage } = require("./getDMReminderMessage");
+
+jest.mock("./getChoreMessage");
+
+describe("getDMReminderMessage", () => {
+  it("should use getChoreMessage to compose its message", () => {
+    getDMReminderMessage();
+    expect(getChoreMessage).toHaveBeenCalled();
+  });
+  it("should let you know this is the last day if 0 days is passed", () => {
+    const message = getDMReminderMessage(0);
+    expect(message).toContain(strings.LAST_DAY);
+  });
+});