improve IRC channel continuity and formatting

internal/ircclient/ircclient_test.go

@@ -0,0 +1,28 @@
+package ircclient
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestRememberRoomMembershipTracksConfirmedChannels(t *testing.T) {
+	var updates []string
+	client := &Client{cfg: Config{
+		OnRoomsChanged: func(rooms []string) {
+			updates = append(updates, strings.Join(rooms, ","))
+		},
+	}}
+
+	client.rememberRoomMembership("#One", true)
+	client.rememberRoomMembership("#two", true)
+	client.rememberRoomMembership("#one", true)
+	client.rememberRoomMembership("#missing", false)
+	client.rememberRoomMembership("#ONE", false)
+
+	if got, want := strings.Join(updates, "|"), "#One|#One,#two|#two"; got != want {
+		t.Fatalf("room updates = %q, want %q", got, want)
+	}
+	if got := strings.Join(client.roomNames, ","); got != "#two" {
+		t.Fatalf("remembered rooms = %q, want %q", got, "#two")
+	}
+}