erc20_test.gno

  1package erc20
  2
  3import (
  4	"strings"
  5	"testing"
  6
  7	"gno.land/p/nt/testutils/v0"
  8	"gno.land/p/nt/uassert/v0"
  9)
 10
 11// Fixed test addresses. testutils.TestAddress derives real, valid-length
 12// addresses; literal strings would fail address.IsValid() and trip the realm's
 13// zero-address guard.
 14var (
 15	alice   = testutils.TestAddress("alice")
 16	bob     = testutils.TestAddress("bob")
 17	spender = testutils.TestAddress("spender")
 18	dest    = testutils.TestAddress("dest")
 19)
 20
 21// reset clears package state between tests so cases stay independent.
 22func reset() {
 23	balances = map[address]uint64{}
 24	allowances = map[address]map[address]uint64{}
 25	totalSupply = 0
 26}
 27
 28// TestMintAndTransfer mints to alice, then transfers alice -> bob.
 29func TestMintAndTransfer(cur realm, t *testing.T) {
 30	reset()
 31
 32	testing.SetRealm(testing.NewUserRealm(alice))
 33	Mint(cross(cur), alice, 1000)
 34
 35	if got := TotalSupply(); got != 1000 {
 36		t.Fatalf("total supply = %d, want 1000", got)
 37	}
 38	if got := BalanceOf(alice); got != 1000 {
 39		t.Fatalf("alice balance = %d, want 1000", got)
 40	}
 41
 42	testing.SetRealm(testing.NewUserRealm(alice))
 43	Transfer(cross(cur), bob, 400)
 44
 45	if got := BalanceOf(alice); got != 600 {
 46		t.Errorf("alice balance = %d, want 600", got)
 47	}
 48	if got := BalanceOf(bob); got != 400 {
 49		t.Errorf("bob balance = %d, want 400", got)
 50	}
 51	if got := TotalSupply(); got != 1000 {
 52		t.Errorf("total supply changed on transfer: %d, want 1000", got)
 53	}
 54}
 55
 56// TestApproveAndTransferFrom exercises the allowance path.
 57func TestApproveAndTransferFrom(cur realm, t *testing.T) {
 58	reset()
 59
 60	testing.SetRealm(testing.NewUserRealm(alice))
 61	Mint(cross(cur), alice, 500)
 62
 63	testing.SetRealm(testing.NewUserRealm(alice))
 64	Approve(cross(cur), spender, 300)
 65	if got := Allowance(alice, spender); got != 300 {
 66		t.Fatalf("allowance = %d, want 300", got)
 67	}
 68
 69	testing.SetRealm(testing.NewUserRealm(spender))
 70	TransferFrom(cross(cur), alice, dest, 200)
 71
 72	if got := BalanceOf(alice); got != 300 {
 73		t.Errorf("owner balance = %d, want 300", got)
 74	}
 75	if got := BalanceOf(dest); got != 200 {
 76		t.Errorf("dest balance = %d, want 200", got)
 77	}
 78	if got := Allowance(alice, spender); got != 100 {
 79		t.Errorf("remaining allowance = %d, want 100", got)
 80	}
 81}
 82
 83// TestTransferInsufficientPanics asserts an over-transfer reverts.
 84func TestTransferInsufficientPanics(cur realm, t *testing.T) {
 85	reset()
 86
 87	testing.SetRealm(testing.NewUserRealm(alice))
 88	Mint(cross(cur), alice, 10)
 89
 90	// Aborts from a cross(cur) call cannot be caught by a plain recover();
 91	// assert on the abort message instead.
 92	testing.SetRealm(testing.NewUserRealm(alice))
 93	uassert.AbortsWithMessage(t, cur, "erc20: insufficient balance", func() {
 94		Transfer(cross(cur), bob, 100) // more than balance -> panic
 95	})
 96}
 97
 98// TestRenderContainsMetadata checks the Markdown view exposes name/symbol/supply.
 99func TestRenderContainsMetadata(cur realm, t *testing.T) {
100	reset()
101
102	testing.SetRealm(testing.NewUserRealm(alice))
103	Mint(cross(cur), alice, 42)
104
105	out := Render("")
106	for _, want := range []string{"MiniToken", "MINI", "Total supply", "42"} {
107		if !strings.Contains(out, want) {
108			t.Errorf("render output missing %q\n%s", want, out)
109		}
110	}
111}