Implements Unittest for Username Update

src/test/java/CredentialRepositoryTest.java

@@ -61,4 +61,16 @@ class CredentialRepositoryTest {
 
     }
 
+    @Test
+    void testUpdateUsername(){
+
+        this.credentialRepository.createNewCredential("mock", "mock");
+        this.credentialRepository.updateUsername(0, "newUsername");
+
+        Credential c = this.credentialRepository.getCredentialsViaId(0);
+
+        Assertions.assertEquals("newPassword", c.getName());
+
+    }
+
 }