Implements Unittest and function to delete credential from arraylist

src/main/java/CredentialRepository.java

@@ -86,6 +86,8 @@ public class CredentialRepository implements CredentialRepositoryInterface{
     @Override
     public void delete(int index) {
 
+        this.credentials.remove(index);
+
     }
 
 

src/test/java/CredentialRepositoryTest.java

@@ -70,6 +70,19 @@ class CredentialRepositoryTest {
         Credential c = this.credentialRepository.getCredentialsViaId(0);
 
         Assertions.assertEquals("newUsername", c.getName());
+    }
+
+    @Test
+    void testDeleteEntry(){
+
+        this.credentialRepository.createNewCredential("mock", "mock");
+        this.credentialRepository.delete(0);
+
+        Assertions.assertEquals(null, this.credentialRepository.getCredentialsViaId(0));
+    }
+
+    @Test
+    void testIndexShiftAfterDeletion(){
 
     }