ringlog_test.gno

  1package ringlog
  2
  3import (
  4	"strconv"
  5	"strings"
  6	"testing"
  7)
  8
  9func resetState() {
 10	buf = [Cap]Entry{}
 11	head = 0
 12	count = 0
 13}
 14
 15func TestPostAndRetrieve(t *testing.T) {
 16	resetState()
 17
 18	Post("hello world")
 19
 20	if count != 1 {
 21		t.Errorf("want count=1, got %d", count)
 22	}
 23	entries := Entries()
 24	if len(entries) != 1 {
 25		t.Fatalf("want 1 entry, got %d", len(entries))
 26	}
 27	if entries[0].Message != "hello world" {
 28		t.Errorf("want 'hello world', got %q", entries[0].Message)
 29	}
 30}
 31
 32func TestLen(t *testing.T) {
 33	resetState()
 34
 35	if Len() != 0 {
 36		t.Errorf("want Len()=0, got %d", Len())
 37	}
 38	Post("a")
 39	Post("b")
 40	Post("c")
 41	if Len() != 3 {
 42		t.Errorf("want Len()=3, got %d", Len())
 43	}
 44}
 45
 46func TestRingWrap(t *testing.T) {
 47	resetState()
 48
 49	// Write Cap+3 messages — the first 3 should be evicted.
 50	for i := 0; i < Cap+3; i++ {
 51		Post("msg" + strconv.Itoa(i))
 52	}
 53
 54	if count != Cap {
 55		t.Errorf("want count=%d after overflow, got %d", Cap, count)
 56	}
 57
 58	entries := Entries()
 59	if len(entries) != Cap {
 60		t.Fatalf("want %d entries, got %d", Cap, len(entries))
 61	}
 62
 63	// Oldest surviving message should be msg3 (msg0..msg2 were overwritten).
 64	if entries[0].Message != "msg3" {
 65		t.Errorf("oldest entry should be 'msg3', got %q", entries[0].Message)
 66	}
 67	// Newest message should be msg(Cap+2).
 68	want := "msg" + strconv.Itoa(Cap+2)
 69	if entries[Cap-1].Message != want {
 70		t.Errorf("newest entry should be %q, got %q", want, entries[Cap-1].Message)
 71	}
 72}
 73
 74func TestChronologicalOrder(t *testing.T) {
 75	resetState()
 76
 77	msgs := []string{"first", "second", "third"}
 78	for _, m := range msgs {
 79		Post(m)
 80	}
 81
 82	entries := Entries()
 83	for i, m := range msgs {
 84		if entries[i].Message != m {
 85			t.Errorf("entry[%d]: want %q, got %q", i, m, entries[i].Message)
 86		}
 87	}
 88}
 89
 90func TestEmptyPanicsOnEmpty(t *testing.T) {
 91	resetState()
 92	defer func() {
 93		if r := recover(); r == nil {
 94			t.Error("expected panic on empty message, got none")
 95		}
 96	}()
 97	Post("   ")
 98}
 99
100func TestTooLongPanics(t *testing.T) {
101	resetState()
102	defer func() {
103		if r := recover(); r == nil {
104			t.Error("expected panic on too-long message, got none")
105		}
106	}()
107	Post(strings.Repeat("x", 281))
108}
109
110func TestRender(t *testing.T) {
111	resetState()
112
113	r := Render("")
114	if !strings.Contains(r, "No messages yet") {
115		t.Error("empty ring should show 'No messages yet'")
116	}
117
118	Post("first message")
119	r = Render("")
120	if !strings.Contains(r, "first message") {
121		t.Error("render should include 'first message'")
122	}
123	if !strings.Contains(r, "RingLog") {
124		t.Error("render should include title 'RingLog'")
125	}
126}