feat: game lobby service

lobby/internal/service/shared/page_test.go

@@ -0,0 +1,125 @@
+package shared_test
+
+import (
+	"encoding/base64"
+	"strconv"
+	"testing"
+
+	"galaxy/lobby/internal/service/shared"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestParsePageDefaults(t *testing.T) {
+	t.Parallel()
+
+	page, err := shared.ParsePage("", "")
+	require.NoError(t, err)
+	require.Equal(t, shared.Page{Size: shared.DefaultPageSize, Offset: 0}, page)
+}
+
+func TestParsePageHonoursSize(t *testing.T) {
+	t.Parallel()
+
+	page, err := shared.ParsePage("75", "")
+	require.NoError(t, err)
+	require.Equal(t, shared.Page{Size: 75, Offset: 0}, page)
+}
+
+func TestParsePageHonoursToken(t *testing.T) {
+	t.Parallel()
+
+	token := shared.EncodeToken(150)
+	page, err := shared.ParsePage("", token)
+	require.NoError(t, err)
+	require.Equal(t, shared.Page{Size: shared.DefaultPageSize, Offset: 150}, page)
+}
+
+func TestParsePageRejectsBadSize(t *testing.T) {
+	t.Parallel()
+
+	cases := []string{"abc", "0", "-3", strconv.Itoa(shared.MaxPageSize + 1)}
+	for _, raw := range cases {
+		t.Run(raw, func(t *testing.T) {
+			t.Parallel()
+			_, err := shared.ParsePage(raw, "")
+			require.Error(t, err)
+			require.Contains(t, err.Error(), "invalid page_size")
+		})
+	}
+}
+
+func TestParsePageRejectsBadToken(t *testing.T) {
+	t.Parallel()
+
+	negative := base64.RawURLEncoding.EncodeToString([]byte("-1"))
+	notInt := base64.RawURLEncoding.EncodeToString([]byte("abc"))
+
+	cases := []string{"!!!", negative, notInt}
+	for _, raw := range cases {
+		t.Run(raw, func(t *testing.T) {
+			t.Parallel()
+			_, err := shared.ParsePage("", raw)
+			require.Error(t, err)
+			require.Contains(t, err.Error(), "invalid page_token")
+		})
+	}
+}
+
+func TestEncodeTokenRoundtrip(t *testing.T) {
+	t.Parallel()
+
+	token := shared.EncodeToken(42)
+	page, err := shared.ParsePage("", token)
+	require.NoError(t, err)
+	require.Equal(t, 42, page.Offset)
+}
+
+func TestWindowFirstPageWithMore(t *testing.T) {
+	t.Parallel()
+
+	start, end, nextOffset, hasMore := shared.Window(120, shared.Page{Size: 50})
+	require.Equal(t, 0, start)
+	require.Equal(t, 50, end)
+	require.Equal(t, 50, nextOffset)
+	require.True(t, hasMore)
+}
+
+func TestWindowMiddlePage(t *testing.T) {
+	t.Parallel()
+
+	start, end, nextOffset, hasMore := shared.Window(120, shared.Page{Size: 50, Offset: 50})
+	require.Equal(t, 50, start)
+	require.Equal(t, 100, end)
+	require.Equal(t, 100, nextOffset)
+	require.True(t, hasMore)
+}
+
+func TestWindowLastPageExact(t *testing.T) {
+	t.Parallel()
+
+	start, end, nextOffset, hasMore := shared.Window(100, shared.Page{Size: 50, Offset: 50})
+	require.Equal(t, 50, start)
+	require.Equal(t, 100, end)
+	require.Equal(t, 0, nextOffset)
+	require.False(t, hasMore)
+}
+
+func TestWindowOffsetPastEnd(t *testing.T) {
+	t.Parallel()
+
+	start, end, nextOffset, hasMore := shared.Window(10, shared.Page{Size: 50, Offset: 200})
+	require.Equal(t, 10, start)
+	require.Equal(t, 10, end)
+	require.Equal(t, 0, nextOffset)
+	require.False(t, hasMore)
+}
+
+func TestWindowZeroSizeFallsBackToDefault(t *testing.T) {
+	t.Parallel()
+
+	start, end, _, hasMore := shared.Window(120, shared.Page{Size: 0})
+	require.Equal(t, 0, start)
+	require.Equal(t, shared.DefaultPageSize, end)
+	require.True(t, hasMore)
+}