Add unit tests

packages/keyring-controller/src/KeyringController.test.ts

@@ -472,6 +472,51 @@ describe('KeyringController', () => {
     });
   });
 
+  describe('decryptMessage', () => {
+    it('should successfully decrypt a message with valid parameters and return the raw decryption result', async () => {
+      await withController(async ({ controller }) => {
+        const messageParams = {
+          from: '0x1234567890abcdef',
+          data: {
+            version: '1.0',
+            nonce: '123456',
+            ephemPublicKey: '0xabcdef1234567890',
+            ciphertext: '0xabcdef1234567890',
+          },
+        };
+        const expectedDecryptionResult = 'decrypted message';
+
+        const decryptMessageMock = jest
+          .fn()
+          .mockResolvedValue(expectedDecryptionResult);
+        controller.decryptMessage = decryptMessageMock;
+
+        const result = await controller.decryptMessage(messageParams);
+
+        expect(result).toBe(expectedDecryptionResult);
+        expect(decryptMessageMock).toHaveBeenCalledWith(messageParams);
+      });
+    });
+
+    it("should throw an error if the 'from' parameter is not a valid account address", async () => {
+      await withController(async ({ controller }) => {
+        const messageParams = {
+          from: 'invalid address',
+          data: {
+            version: '1.0',
+            nonce: '123456',
+            ephemPublicKey: '0xabcdef1234567890',
+            ciphertext: '0xabcdef1234567890',
+          },
+        };
+
+        await expect(controller.decryptMessage(messageParams)).rejects.toThrow(
+          'KeyringController - No keyring found. Error info: The address passed in is invalid/empty',
+        );
+      });
+    });
+  });
+
   describe('getKeyringForAccount', () => {
     describe('when existing account is provided', () => {
       it('should get correct keyring', async () => {