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1package pointers
2
3import "testing"
4
5func TestWallet(t *testing.T) {
6 t.Run("deposit", func(t *testing.T) {
7 wallet := Wallet{}
8
9 wallet.Deposit(Bitcoin(10))
10
11 assertBalance(t, wallet, Bitcoin(10))
12 })
13
14 t.Run("withdraw", func(t *testing.T) {
15 wallet := Wallet{balance: Bitcoin(20)}
16
17 err := wallet.Withdraw(Bitcoin(10))
18
19 assertNoError(t, err)
20 assertBalance(t, wallet, Bitcoin(10))
21 })
22
23 t.Run("withdraw insufficient funds", func(t *testing.T) {
24 startingBalance := Bitcoin(20)
25 wallet := Wallet{startingBalance}
26 err := wallet.Withdraw(Bitcoin(100))
27
28 assertError(t, err, "cannot withdraw, insufficient funds")
29 assertBalance(t, wallet, startingBalance)
30 })
31}
32
33func assertBalance(t testing.TB, wallet Wallet, want Bitcoin) {
34 t.Helper()
35 got := wallet.Balance()
36
37 if got != want {
38 t.Errorf("got %s want %s", got, want)
39 }
40}
41
42func assertNoError(t testing.TB, got error) {
43 t.Helper()
44
45 if got != nil {
46 t.Fatal("got an error butt didn't want one")
47 }
48}
49
50
51func assertError(t testing.TB, got error, want string) {
52 t.Helper()
53
54 if got == nil {
55 t.Fatal("didn't get an error but wanted one")
56 }
57
58 if got.Error() != want {
59 t.Errorf("got %q, want %q", got, want)
60 }
61}