tests: Add tests for adaptReplyToRecipient function to validate recipient handling

Author: aolamide

src/__tests__/adapters/recipients.test.ts

@@ -1,5 +1,6 @@
 import adaptRecipients, {
   adaptSingleRecipient,
+  adaptReplyToRecipient,
 } from "../../adapters/recipients";
 
 describe("adapters/recipients: ", () => {
@@ -85,4 +86,60 @@ describe("adapters/recipients: ", () => {
       expect(result).toEqual(expectedResult);
     });
   });
+
+  describe("adaptReplyToRecipient(): ", () => {
+    it("returns undefined if recipients is invalid.", () => {
+      const recipients = undefined;
+
+      const expectedResult = undefined;
+      const result = adaptReplyToRecipient(recipients);
+
+      expect(result).toEqual(expectedResult);
+    });
+
+    it("returns undefined if recipients is empty array.", () => {
+      const recipients: any = [];
+
+      const expectedResult = undefined;
+      const result = adaptReplyToRecipient(recipients);
+
+      expect(result).toEqual(expectedResult);
+    });
+
+    it("returns adapted recipients if it's not an array.", () => {
+      const recipients = {
+        name: "mock-name",
+        address: "mock-email",
+      };
+
+      const expectedResult = {
+        name: recipients.name,
+        email: recipients.address,
+      };
+      const result = adaptReplyToRecipient(recipients);
+
+      expect(result).toEqual(expectedResult);
+    });
+
+    it("returns first adapted recipient if it's an array.", () => {
+      const recipients = [
+        {
+          name: "mock-name-1",
+          address: "mock-email-1",
+        },
+        {
+          name: "mock-name-2",
+          address: "mock-email-2",
+        },
+      ];
+
+      const expectedResult = {
+        name: recipients[0].name,
+        email: recipients[0].address,
+      };
+      const result = adaptReplyToRecipient(recipients);
+
+      expect(result).toEqual(expectedResult);
+    });
+  });
 });