Feature/808 validate root certificates

core/src/test/java/dev/fitko/fitconnect/core/validation/DefaultValidationServiceTest.java

@@ -168,7 +168,7 @@ class DefaultValidationServiceTest {
 
         // Then
         assertTrue(validationResult.hasError());
-        assertThat(validationResult.getError().getMessage(), containsString("\"x5c\" is null"));
+        assertThat(validationResult.getError().getMessage(), containsString("Root certificates value cannot be null or empty"));
     }