Merge pull request #36 from andresWeitzel/testing-04-add-unit-test-for-dynamodb-config

testing-04-add-unit-test-for-dynamodb-config

Author: andresWeitzel

package.json

@@ -12,9 +12,10 @@
     "format-remark": "remark . --quiet --frail --output",
     "format-md": "remark . --output",
     "test": "jest --verbose",
-    "test:watch": "jest --watch --verbose",
-    "test:cov": "jest --coverage --verbose",
-    "test:dates-helper": "jest --verbose ./src/test/helpers/date-time/*"
+    "test:watch": "jest --watch --verbose --detectOpenHandles",
+    "test:cov": "jest --coverage --verbose --detectOpenHandles",
+    "test:dates-helper": "jest --verbose --detectOpenHandles ./src/test/helpers/date-time/*",
+    "test:dates-dynamodb": "jest --verbose --detectOpenHandles ./src/test/helpers/dynamodb/*"
   },
   "repository": {
     "type": "git",

src/helpers/dynamodb/config/client.js

@@ -1,7 +1,9 @@
 //External
 const { DynamoDBDocumentClient } = require('@aws-sdk/lib-dynamodb');
 const { DynamoDBClient } = require('@aws-sdk/client-dynamodb');
-//Const-vars
+//Const
+const DYNAMO_DB_CLIENT_ERROR = 'ERROR in dynamoDBClient helper function.';
+//Vars
 let client;
 let dynamo;
 let msgResponse;
@@ -24,7 +26,7 @@ const dynamoDBClient = async () => {
 
     return dynamo;
   } catch (error) {
-    msgResponse = 'ERROR in dynamoDBClient() function.';
+    msgResponse = DYNAMO_DB_CLIENT_ERROR;
     msgLog = msgResponse + `Caused by ${error}`;
     console.log(msgLog);
     return msgResponse;

src/test/helpers/dynamodb/config/client.test.js

@@ -0,0 +1,64 @@
+"use strict";
+//Helpers
+const {
+  dynamoDBClient,
+} = require("../../../../helpers/dynamodb/config/client");
+//Const
+const MOCK_OBJECT = {};
+//Vars
+let msg;
+let dynamoDBClientResult;
+
+describe("- dynamoDBClient helper (Unit Test)", () => {
+  describe("1) Check cases for arguments.", () => {
+    msg =
+      "Should return a object type if no arguments are passed (This function does not expect arguments)";
+    it(msg, async () => {
+      dynamoDBClientResult = await dynamoDBClient();
+      await expect(typeof dynamoDBClientResult == "object").toBe(true);
+    });
+
+    msg =
+      "Should return a object type if one argument is passed (This function does not expect arguments)";
+    it(msg, async () => {
+      dynamoDBClientResult = await dynamoDBClient(MOCK_OBJECT);
+      await expect(typeof dynamoDBClientResult == "object").toBe(true);
+    });
+
+    msg =
+      "Should return a object type if two argument are passed (This function does not expect arguments)";
+    it(msg, async () => {
+      dynamoDBClientResult = await dynamoDBClient(MOCK_OBJECT, MOCK_OBJECT);
+      await expect(typeof dynamoDBClientResult == "object").toBe(true);
+    });
+
+    msg =
+      "Should return a object type if a null value is passed (This function does not expect arguments)";
+    it(msg, async () => {
+      dynamoDBClientResult = await dynamoDBClient(null);
+      await expect(typeof dynamoDBClientResult == "object").toBe(true);
+    });
+
+    msg =
+      "Should return a object type if a undefined value is passed (This function does not expect arguments)";
+    it(msg, async () => {
+      dynamoDBClientResult = await dynamoDBClient(undefined);
+      await expect(typeof dynamoDBClientResult == "object").toBe(true);
+    });
+  });
+
+  describe("2) Check cases for error.", () => {
+    msg =
+      "Should not return a error message and not throw an Error if no argument is passed to the function (This function does not expect arguments).";
+    it(msg, async () => {
+      await expect(async () => await dynamoDBClient()).not.toThrow(Error);
+    });
+    msg =
+      "Should not return a error message and not throw an Error if a new Error is passed to the function (This function does not expect arguments).";
+    it(msg, async () => {
+      await expect(async () => await dynamoDBClient(new Error())).not.toThrow(
+        Error
+      );
+    });
+  });
+});