kingofdice_test.gno

 1package kingofdice
 2
 3import (
 4	"strings"
 5	"testing"
 6
 7	"gno.land/p/nt/avl/v0"
 8	"gno.land/p/nt/testutils/v0"
 9)
10
11// resetState clears package globals between tests.
12func resetState() {
13	players = avl.Tree{}
14	var zero address
15	king = zero
16	kingRoll = 0
17	reignSince = 0
18	nonce = 0
19	totalRolls = 0
20}
21
22func TestPseudoRollDeterministicAndRanged(t *testing.T) {
23	alice := testutils.TestAddress("alice")
24
25	r1 := pseudoRoll(alice, 1, 100)
26	r2 := pseudoRoll(alice, 1, 100)
27	if r1 != r2 {
28		t.Fatalf("same inputs must give same roll: %d != %d", r1, r2)
29	}
30	if r1 < 1 || r1 > 100 {
31		t.Fatalf("roll must be in [1, 100], got %d", r1)
32	}
33
34	r3 := pseudoRoll(alice, 2, 100)
35	if r1 == r3 {
36		t.Fatal("different nonce should (almost always) change the roll")
37	}
38}
39
40// Crossing test: takes `cur realm` so it can call crossing functions via
41// cross(cur). SetRealm is called directly in this frame.
42func TestRollCrownsFirstCallerThenSwapsOnHigherRoll(cur realm, t *testing.T) {
43	resetState()
44
45	alice := testutils.TestAddress("alice")
46	bob := testutils.TestAddress("bob")
47
48	testing.SetRealm(testing.NewUserRealm(alice))
49	Roll(cross(cur))
50	if !king.IsValid() {
51		t.Fatal("someone should be king after first roll")
52	}
53	firstKing := king
54
55	// Keep rolling as bob until bob out-rolls alice, or give up after a
56	// generous number of attempts (rolls are deterministic per nonce/height,
57	// so this always terminates locally).
58	testing.SetRealm(testing.NewUserRealm(bob))
59	for i := 0; i < 200 && king == firstKing; i++ {
60		Roll(cross(cur))
61	}
62
63	if get(alice).reigns != 1 {
64		t.Fatalf("alice should have exactly one recorded reign, got %d", get(alice).reigns)
65	}
66}
67
68func TestRenderShowsNoKingThenKing(cur realm, t *testing.T) {
69	resetState()
70	if !strings.Contains(Render(""), "No king yet") {
71		t.Fatal("expected empty-board placeholder")
72	}
73
74	alice := testutils.TestAddress("alice")
75	testing.SetRealm(testing.NewUserRealm(alice))
76	Roll(cross(cur))
77
78	out := Render("")
79	if !strings.Contains(out, "Current king") {
80		t.Fatal("expected current king section once someone rolled")
81	}
82	if !strings.Contains(out, "Blocks reigned") {
83		t.Fatal("expected leaderboard header")
84	}
85}