added testing part

readme.md

@@ -220,6 +220,21 @@ public Image getImage(URL url, String name) {
 }
 ```
 
+## Testing
+
+Junit will be used to perform tests as it is the most popular testing frameworks for java.
+
+```java
+public class UserServiceTests {
+
+    @Test
+    public void TestUserPermissions() {
+        User user = new User();
+        // testing done here
+    }
+}
+```
+
 # Frontend
 
 Documenting the frontend is quite hard, but since there will be state management and complicated classes for managing data it has to be all written down.
@@ -268,6 +283,31 @@ stateDiagram-v2
     Crash --> [*]
 ```
 
+## Testing
+
+For testing typescript classes and it's methods [Jest](https://jestjs.io/docs/getting-started) (jestjs) will be used.
+
+Example:
+
+1. Define the test in `tests/test.ts`
+
+```typescript
+// tests/testClass.ts
+function sum(a, b) {
+  a + b;
+}
+
+test("adds 1 + 2 to equal 3", () => {
+  expect(sum(1, 2)).toBe(3);
+});
+```
+
+2. Run test
+
+```bash
+npm test
+```
+
 # Development
 
 ## CI _Continuous Integration_