Add tests for for loop

Signed-off-by: Marcel Müller <neikos@neikos.email>

src/eval/mod.rs

@@ -151,6 +151,7 @@ pub fn execute(vm: &VMInstructions, global_context: &Context) -> Result<String,
                     };
 
                     ip = *new_ip;
+                    continue;
                 }
             }
             Instruction::GetIteratorEmptyOrJump {
@@ -166,6 +167,7 @@ pub fn execute(vm: &VMInstructions, global_context: &Context) -> Result<String,
                     };
 
                     ip = *new_ip;
+                    continue;
                 }
             }
             Instruction::PopScope => scopes.pop_scope(),