TEST_P() and code in same file - Test Fail

03bankacc_fail.cpp

#include <iostream>
#include <gtest/gtest.h>

struct BankAccount {
  int balance = 0;
  BankAccount() {
  }

  explicit BankAccount(const int balance)
   : balance{balance} {
  }
  
  void deposit(int amount) {
    balance += amount;
  }

  bool withdraw(int amount) {
  }
};

struct BankAccountTest : testing::Test { 
  BankAccount *account;

  BankAccountTest() {
    account = new BankAccount;
  }
  virtual ~BankAccountTest() {
    delete account;
  }
};

struct account_state {
  int initial_balance;
  int withdrawal_amount;
  int final_balance;
  bool success;
};

struct withdrawAccountTest : BankAccountTest , testing::WithParamInterface<account_state> {
  
  withdrawAccountTest() {
    account->balance = GetParam().initial_balance;
  }
};

TEST_P(withdrawAccountTest, FinalBalance) {
  auto as = GetParam();
  auto success = account->withdraw(as.withdrawal_amount);
  EXPECT_EQ(as.final_balance,account->balance);
  EXPECT_EQ(as.success,success);
}

INSTANTIATE_TEST_CASE_P(Default, withdrawAccountTest,
  testing::Values(
    account_state{100,50,50,true},
    account_state{100,200,100,false}
    ));

int main(int argc, char **argv) {
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}