test(irc): add unit tests for IRC channel

Test NewIRCChannel validation, extractHost, isBotMentioned,
stripBotMention, and isAlphanumeric helper functions.

pkg/channels/irc/irc_test.go

@@ -0,0 +1,134 @@
+package irc
+
+import (
+	"testing"
+
+	"github.com/sipeed/picoclaw/pkg/bus"
+	"github.com/sipeed/picoclaw/pkg/config"
+)
+
+func TestNewIRCChannel(t *testing.T) {
+	msgBus := bus.NewMessageBus()
+
+	t.Run("missing server", func(t *testing.T) {
+		cfg := config.IRCConfig{Nick: "bot"}
+		_, err := NewIRCChannel(cfg, msgBus)
+		if err == nil {
+			t.Error("expected error for missing server, got nil")
+		}
+	})
+
+	t.Run("missing nick", func(t *testing.T) {
+		cfg := config.IRCConfig{Server: "irc.example.com:6667"}
+		_, err := NewIRCChannel(cfg, msgBus)
+		if err == nil {
+			t.Error("expected error for missing nick, got nil")
+		}
+	})
+
+	t.Run("valid config", func(t *testing.T) {
+		cfg := config.IRCConfig{
+			Server:   "irc.example.com:6667",
+			Nick:     "testbot",
+			Channels: []string{"#test"},
+		}
+		ch, err := NewIRCChannel(cfg, msgBus)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if ch.Name() != "irc" {
+			t.Errorf("Name() = %q, want %q", ch.Name(), "irc")
+		}
+		if ch.IsRunning() {
+			t.Error("new channel should not be running")
+		}
+	})
+}
+
+func TestExtractHost(t *testing.T) {
+	tests := []struct {
+		server string
+		want   string
+	}{
+		{"irc.libera.chat:6697", "irc.libera.chat"},
+		{"localhost:6667", "localhost"},
+		{"irc.example.com", "irc.example.com"},
+		{"", ""},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.server, func(t *testing.T) {
+			got := extractHost(tt.server)
+			if got != tt.want {
+				t.Errorf("extractHost(%q) = %q, want %q", tt.server, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestIsBotMentioned(t *testing.T) {
+	tests := []struct {
+		name    string
+		content string
+		nick    string
+		want    bool
+	}{
+		{"colon prefix", "bot: hello", "bot", true},
+		{"comma prefix", "bot, hello", "bot", true},
+		{"case insensitive", "BOT: hello", "bot", true},
+		{"word boundary mid", "hey bot what's up", "bot", true},
+		{"no mention", "hello world", "bot", false},
+		{"substring mismatch", "robotics are cool", "bot", false},
+		{"nick at end", "hello bot", "bot", true},
+		{"empty content", "", "bot", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := isBotMentioned(tt.content, tt.nick)
+			if got != tt.want {
+				t.Errorf("isBotMentioned(%q, %q) = %v, want %v", tt.content, tt.nick, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestStripBotMention(t *testing.T) {
+	tests := []struct {
+		name    string
+		content string
+		nick    string
+		want    string
+	}{
+		{"colon prefix", "bot: hello there", "bot", "hello there"},
+		{"comma prefix", "bot, help me", "bot", "help me"},
+		{"case insensitive", "BOT: hello", "bot", "hello"},
+		{"no prefix match", "hello bot", "bot", "hello bot"},
+		{"only prefix", "bot:", "bot", ""},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := stripBotMention(tt.content, tt.nick)
+			if got != tt.want {
+				t.Errorf("stripBotMention(%q, %q) = %q, want %q", tt.content, tt.nick, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestIsAlphanumeric(t *testing.T) {
+	alphanumeric := "azAZ09_"
+	for _, b := range []byte(alphanumeric) {
+		if !isAlphanumeric(b) {
+			t.Errorf("isAlphanumeric(%q) = false, want true", string(b))
+		}
+	}
+
+	nonAlpha := " !@#:,"
+	for _, b := range []byte(nonAlpha) {
+		if isAlphanumeric(b) {
+			t.Errorf("isAlphanumeric(%q) = true, want false", string(b))
+		}
+	}
+}