diff --git a/projects/ai-customer-service/internal/app/app_test.go b/projects/ai-customer-service/internal/app/app_test.go
new file mode 100644
index 00000000..93da7e76
--- /dev/null
+++ b/projects/ai-customer-service/internal/app/app_test.go
@@ -0,0 +1,263 @@
+package app
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/bridge/ai-customer-service/internal/config"
+	"github.com/bridge/ai-customer-service/internal/platform/health"
+	"github.com/bridge/ai-customer-service/internal/platform/logging"
+)
+
+// minimalHTTPConfig returns a config minimal enough to let New() succeed with in-memory stores.
+func minimalHTTPConfig() *config.Config {
+	cfg := &config.Config{}
+	cfg.HTTP.Addr = ":0"
+	cfg.HTTP.ReadHeaderTimeout = 5
+	cfg.HTTP.ReadTimeout = 10
+	cfg.HTTP.WriteTimeout = 15
+	cfg.HTTP.IdleTimeout = 60
+	cfg.HTTP.MaxHeaderBytes = 1 << 20
+	cfg.HTTP.MaxBodyBytes = 1 << 20
+	cfg.Postgres.Enabled = false
+	return cfg
+}
+
+func TestNew_NilConfig(t *testing.T) {
+	_, err := New(nil, logging.New())
+	if err == nil {
+		t.Fatal("expected error for nil config")
+	}
+	if err.Error() != "config is required" {
+		t.Errorf("unexpected error message: %v", err)
+	}
+}
+
+func TestNew_DefaultLogger(t *testing.T) {
+	cfg := &config.Config{}
+	cfg.HTTP.Addr = ":0"
+	cfg.HTTP.ReadHeaderTimeout = 5
+	cfg.HTTP.ReadTimeout = 10
+	cfg.HTTP.WriteTimeout = 15
+	cfg.HTTP.IdleTimeout = 60
+	cfg.HTTP.MaxHeaderBytes = 1 << 20
+	cfg.HTTP.MaxBodyBytes = 1 << 20
+
+	// Passing nil logger should not panic and should use default
+	app, err := New(cfg, nil)
+	if err != nil {
+		t.Fatalf("New() with nil logger failed: %v", err)
+	}
+	if app == nil {
+		t.Fatal("expected non-nil app")
+	}
+	if app.Logger == nil {
+		t.Error("expected non-nil logger (should default)")
+	}
+}
+
+func TestNew_WithPostgresDisabled(t *testing.T) {
+	cfg := &config.Config{}
+	cfg.HTTP.Addr = ":0"
+	cfg.HTTP.ReadHeaderTimeout = 5
+	cfg.HTTP.ReadTimeout = 10
+	cfg.HTTP.WriteTimeout = 15
+	cfg.HTTP.IdleTimeout = 60
+	cfg.HTTP.MaxHeaderBytes = 1 << 20
+	cfg.HTTP.MaxBodyBytes = 1 << 20
+	cfg.Postgres.Enabled = false
+
+	app, err := New(cfg, logging.New())
+	if err != nil {
+		t.Fatalf("New() failed: %v", err)
+	}
+	if app.Server == nil {
+		t.Fatal("expected non-nil server")
+	}
+	if app.Probe == nil {
+		t.Fatal("expected non-nil probe")
+	}
+	if app.ticketStore == nil {
+		t.Fatal("expected non-nil ticketStore")
+	}
+}
+
+func TestApp_TicketStore(t *testing.T) {
+	cfg := &config.Config{}
+	cfg.HTTP.Addr = ":0"
+	cfg.HTTP.ReadHeaderTimeout = 5
+	cfg.HTTP.ReadTimeout = 10
+	cfg.HTTP.WriteTimeout = 15
+	cfg.HTTP.IdleTimeout = 60
+	cfg.HTTP.MaxHeaderBytes = 1 << 20
+	cfg.HTTP.MaxBodyBytes = 1 << 20
+	cfg.Postgres.Enabled = false
+
+	app, err := New(cfg, logging.New())
+	if err != nil {
+		t.Fatalf("New() failed: %v", err)
+	}
+
+	store := app.TicketStore()
+	if store == nil {
+		t.Fatal("TicketStore() returned nil")
+	}
+
+	// Should be usable as ticketLister
+	// Just verify it's not nil and the type assertion works
+	_ = store
+}
+
+func TestApp_Shutdown_NilApp(t *testing.T) {
+	var app *App
+	err := app.Shutdown(nil)
+	if err != nil {
+		t.Fatalf("Shutdown on nil app should return nil error, got: %v", err)
+	}
+}
+
+func TestApp_Shutdown_NilServer(t *testing.T) {
+	app := &App{Server: nil, Probe: nil}
+	if err := app.Shutdown(nil); err != nil {
+		t.Fatalf("Shutdown on nil server should return nil error, got: %v", err)
+	}
+}
+
+func TestApp_Shutdown_ServerShutdownCalled(t *testing.T) {
+	t.Run("server is shut down and stops accepting connections", func(t *testing.T) {
+		// Use a real httptest server to get a valid listener
+		ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
+		listener := ts.Listener
+		ts.Close()
+
+		app := &App{
+			Server: &http.Server{
+				Addr:    listener.Addr().String(),
+				Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}),
+			},
+			Logger: logging.New(),
+		}
+
+		go func() { _ = app.Server.Serve(listener) }()
+		time.Sleep(10 * time.Millisecond)
+
+		err := app.Shutdown(context.Background())
+		if err != nil {
+			t.Fatalf("Shutdown returned unexpected error: %v", err)
+		}
+
+		// Verify the server is actually shut down by checking it no longer accepts connections
+		conn, err := net.Dial("tcp", listener.Addr().String())
+		if err == nil {
+			conn.Close()
+			t.Error("server should not be accepting connections after Shutdown")
+		}
+	})
+}
+
+func TestApp_Shutdown_CallsAllClosersInOrder(t *testing.T) {
+	callOrder := []string{}
+
+	firstCloser := func() error {
+		callOrder = append(callOrder, "first")
+		return nil
+	}
+	secondCloser := func() error {
+		callOrder = append(callOrder, "second")
+		return nil
+	}
+	thirdCloser := func() error {
+		callOrder = append(callOrder, "third")
+		return nil
+	}
+
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
+	listener := ts.Listener
+	ts.Close()
+
+	app := &App{
+		Server: &http.Server{
+			Addr:    listener.Addr().String(),
+			Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}),
+		},
+		Logger:  logging.New(),
+		closers: []func() error{firstCloser, secondCloser, thirdCloser},
+	}
+
+	go func() { _ = app.Server.Serve(listener) }()
+	time.Sleep(10 * time.Millisecond)
+
+	_ = app.Shutdown(context.Background())
+
+	if len(callOrder) != 3 {
+		t.Fatalf("expected 3 closer calls, got %d: %v", len(callOrder), callOrder)
+	}
+	if callOrder[0] != "first" || callOrder[1] != "second" || callOrder[2] != "third" {
+		t.Errorf("closers called in wrong order: %v", callOrder)
+	}
+}
+
+func TestApp_Shutdown_ProbeSetNotReady(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
+	listener := ts.Listener
+	ts.Close()
+
+	probe := health.NewProbe()
+	probe.SetReady(true)
+	probe.SetLive(true)
+
+	app := &App{
+		Server: &http.Server{
+			Addr:    listener.Addr().String(),
+			Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}),
+		},
+		Probe: probe,
+		Logger: logging.New(),
+	}
+
+	go func() { _ = app.Server.Serve(listener) }()
+	time.Sleep(10 * time.Millisecond)
+
+	_ = app.Shutdown(context.Background())
+
+	if probe.IsReady() {
+		t.Error("Probe should not be ready after Shutdown")
+	}
+	if probe.IsLive() {
+		t.Error("Probe should not be live after Shutdown")
+	}
+}
+
+func TestNew_WithPostgresEnabled_InvalidDSN(t *testing.T) {
+	cfg := minimalHTTPConfig()
+	cfg.Postgres.Enabled = true
+	cfg.Postgres.DSN = "invalid_dsn_format"
+	cfg.Postgres.MaxOpenConns = 5
+	cfg.Postgres.MaxIdleConns = 2
+	cfg.Postgres.ConnMaxLifetime = 300
+
+	_, err := New(cfg, logging.New())
+	if err == nil {
+		t.Fatal("expected error when postgres enabled with invalid DSN")
+	}
+}
+
+func TestNew_WithPostgresEnabled_MigrationFails(t *testing.T) {
+	cfg := minimalHTTPConfig()
+	cfg.Postgres.Enabled = true
+	// Point to a db that exists but migration dir doesn't exist
+	cfg.Postgres.DSN = "host=127.0.0.1 port=9999 user=postgres dbname=nonexistent password=nonexistent sslmode=disable"
+	cfg.Postgres.MigrationDir = "/nonexistent/migration/dir"
+	cfg.Postgres.MaxOpenConns = 5
+	cfg.Postgres.MaxIdleConns = 2
+	cfg.Postgres.ConnMaxLifetime = 300
+
+	_, err := New(cfg, logging.New())
+	if err == nil {
+		t.Fatal("expected error when postgres migration directory does not exist")
+	}
+}
diff --git a/projects/ai-customer-service/internal/config/config_test.go b/projects/ai-customer-service/internal/config/config_test.go
new file mode 100644
index 00000000..50f0093c
--- /dev/null
+++ b/projects/ai-customer-service/internal/config/config_test.go
@@ -0,0 +1,115 @@
+package config
+
+import "testing"
+
+func TestGetEnvBool_True(t *testing.T) {
+	t.Setenv("TEST_BOOL", "true")
+	got := getEnvBool("TEST_BOOL", false)
+	if !got {
+		t.Error("getEnvBool(true) = false, want true")
+	}
+}
+
+func TestGetEnvBool_TrueCaseInsensitive(t *testing.T) {
+	t.Setenv("TEST_BOOL", "TRUE")
+	got := getEnvBool("TEST_BOOL", false)
+	if !got {
+		t.Error("getEnvBool(TRUE) = false, want true")
+	}
+}
+
+func TestGetEnvBool_False(t *testing.T) {
+	t.Setenv("TEST_BOOL", "false")
+	got := getEnvBool("TEST_BOOL", true)
+	if got {
+		t.Error("getEnvBool(false) = true, want false")
+	}
+}
+
+func TestGetEnvBool_One(t *testing.T) {
+	t.Setenv("TEST_BOOL", "1")
+	got := getEnvBool("TEST_BOOL", false)
+	if !got {
+		t.Error("getEnvBool(1) = false, want true")
+	}
+}
+
+func TestGetEnvBool_Zero(t *testing.T) {
+	t.Setenv("TEST_BOOL", "0")
+	got := getEnvBool("TEST_BOOL", true)
+	if got {
+		t.Error("getEnvBool(0) = true, want false")
+	}
+}
+
+func TestGetEnvBool_InvalidValue(t *testing.T) {
+	t.Setenv("TEST_BOOL", "yes")
+	got := getEnvBool("TEST_BOOL", true)
+	if !got {
+		t.Error("getEnvBool(yes) did not return fallback, got false, want true")
+	}
+}
+
+func TestGetEnvInt_ValidValue(t *testing.T) {
+	t.Setenv("TEST_INT", "999")
+	got := getEnvInt("TEST_INT", 5)
+	if got != 999 {
+		t.Errorf("getEnvInt(TEST_INT) = %d, want 999", got)
+	}
+}
+
+func TestGetEnvInt_InvalidValue(t *testing.T) {
+	t.Setenv("TEST_INT", "notanumber")
+	got := getEnvInt("TEST_INT", 42)
+	if got != 42 {
+		t.Errorf("getEnvInt(invalid) = %d, want fallback 42", got)
+	}
+}
+
+func TestGetEnvInt64_ValidValue(t *testing.T) {
+	t.Setenv("TEST_INT64", "12345678901234")
+	got := getEnvInt64("TEST_INT64", 0)
+	if got != 12345678901234 {
+		t.Errorf("getEnvInt64(TEST_INT64) = %d, want 12345678901234", got)
+	}
+}
+
+func TestLoadDefaults(t *testing.T) {
+	t.Setenv("AI_CS_ADDR", "")
+	cfg, err := Load()
+	if err != nil {
+		t.Fatalf("Load() error = %v", err)
+	}
+	if cfg.HTTP.Addr != ":8080" {
+		t.Fatalf("addr = %s, want :8080", cfg.HTTP.Addr)
+	}
+	if cfg.HTTP.MaxBodyBytes <= 0 {
+		t.Fatalf("expected positive max body bytes")
+	}
+	if cfg.Webhook.TimestampHeader != "X-CS-Timestamp" {
+		t.Fatalf("timestamp header = %s", cfg.Webhook.TimestampHeader)
+	}
+}
+
+func TestLoadOverride(t *testing.T) {
+	t.Setenv("AI_CS_ADDR", ":18080")
+	t.Setenv("AI_CS_MAX_BODY_BYTES", "2048")
+	t.Setenv("AI_CS_WEBHOOK_SECRET", "secret")
+	t.Setenv("AI_CS_WEBHOOK_MAX_SKEW_SECONDS", "60")
+	cfg, err := Load()
+	if err != nil {
+		t.Fatalf("Load() error = %v", err)
+	}
+	if cfg.HTTP.Addr != ":18080" {
+		t.Fatalf("addr = %s, want :18080", cfg.HTTP.Addr)
+	}
+	if cfg.HTTP.MaxBodyBytes != 2048 {
+		t.Fatalf("max body bytes = %d, want 2048", cfg.HTTP.MaxBodyBytes)
+	}
+	if cfg.Webhook.Secret != "secret" {
+		t.Fatalf("expected webhook secret")
+	}
+	if cfg.Webhook.MaxSkewSeconds != 60 {
+		t.Fatalf("skew = %d, want 60", cfg.Webhook.MaxSkewSeconds)
+	}
+}
diff --git a/projects/ai-customer-service/internal/domain/intent/intent_test.go b/projects/ai-customer-service/internal/domain/intent/intent_test.go
new file mode 100644
index 00000000..81980431
--- /dev/null
+++ b/projects/ai-customer-service/internal/domain/intent/intent_test.go
@@ -0,0 +1,70 @@
+package intent
+
+import "testing"
+
+func TestResult_Fields(t *testing.T) {
+	r := Result{
+		Intent:     IntentQuota,
+		Confidence: 0.95,
+		Entities:   map[string]string{"key": "value"},
+		NeedsHuman: false,
+		Sensitive:  false,
+	}
+	if r.Intent != IntentQuota {
+		t.Errorf("Intent = %q, want %q", r.Intent, IntentQuota)
+	}
+	if r.Confidence != 0.95 {
+		t.Errorf("Confidence = %f, want 0.95", r.Confidence)
+	}
+	if r.NeedsHuman {
+		t.Error("NeedsHuman = true, want false")
+	}
+}
+
+func TestResult_NeedsHuman(t *testing.T) {
+	r := Result{NeedsHuman: true}
+	if !r.NeedsHuman {
+		t.Error("NeedsHuman = false, want true")
+	}
+}
+
+func TestResult_Sensitive(t *testing.T) {
+	r := Result{Sensitive: true}
+	if !r.Sensitive {
+		t.Error("Sensitive = false, want true")
+	}
+}
+
+func TestResult_EntitiesMap(t *testing.T) {
+	r := Result{
+		Intent:   IntentGeneral,
+		Entities: map[string]string{"user": "alice", "action": "refund"},
+	}
+	if len(r.Entities) != 2 {
+		t.Errorf("len(Entities) = %d, want 2", len(r.Entities))
+	}
+	if r.Entities["user"] != "alice" {
+		t.Errorf("Entities[user] = %q, want %q", r.Entities["user"], "alice")
+	}
+}
+
+func TestIntentConstants(t *testing.T) {
+	intents := []string{IntentQuota, IntentToken, IntentError, IntentHandoff, IntentGeneral, IntentRefund, IntentSecurity}
+	for _, intent := range intents {
+		if intent == "" {
+			t.Errorf("intent constant is empty string")
+		}
+	}
+}
+
+func TestIntentQuota(t *testing.T) {
+	if IntentQuota != "quota" {
+		t.Errorf("IntentQuota = %q, want %q", IntentQuota, "quota")
+	}
+}
+
+func TestIntentHandoff(t *testing.T) {
+	if IntentHandoff != "handoff" {
+		t.Errorf("IntentHandoff = %q, want %q", IntentHandoff, "handoff")
+	}
+}
diff --git a/projects/ai-customer-service/internal/domain/message/message_test.go b/projects/ai-customer-service/internal/domain/message/message_test.go
new file mode 100644
index 00000000..6fa669d3
--- /dev/null
+++ b/projects/ai-customer-service/internal/domain/message/message_test.go
@@ -0,0 +1,76 @@
+package message
+
+import (
+	"testing"
+	"time"
+)
+
+func TestUnifiedMessage_Fields(t *testing.T) {
+	now := time.Now()
+	msg := UnifiedMessage{
+		MessageID:   "msg_123",
+		Channel:     "widget",
+		OpenID:      "user_456",
+		UserID:      "internal_789",
+		Content:     "hello world",
+		ContentType: "text/plain",
+		Timestamp:   now,
+		ReplyTo:     "parent_msg",
+	}
+	if msg.MessageID != "msg_123" {
+		t.Errorf("MessageID = %q, want %q", msg.MessageID, "msg_123")
+	}
+	if msg.Channel != "widget" {
+		t.Errorf("Channel = %q, want %q", msg.Channel, "widget")
+	}
+	if msg.Content != "hello world" {
+		t.Errorf("Content = %q, want %q", msg.Content, "hello world")
+	}
+	if msg.ReplyTo != "parent_msg" {
+		t.Errorf("ReplyTo = %q, want %q", msg.ReplyTo, "parent_msg")
+	}
+}
+
+func TestUnifiedMessage_OptionalFields(t *testing.T) {
+	msg := UnifiedMessage{
+		MessageID: "msg_1",
+		Channel:   "web",
+		OpenID:    "u1",
+		Content:   "hi",
+	}
+	if msg.UserID != "" {
+		t.Errorf("UserID = %q, want empty", msg.UserID)
+	}
+	if msg.ContentType != "" {
+		t.Errorf("ContentType = %q, want empty", msg.ContentType)
+	}
+	if msg.ReplyTo != "" {
+		t.Errorf("ReplyTo = %q, want empty", msg.ReplyTo)
+	}
+}
+
+func TestUnifiedMessage_Timestamp(t *testing.T) {
+	now := time.Now()
+	msg := UnifiedMessage{
+		MessageID: "msg_1",
+		Channel:   "widget",
+		OpenID:    "u1",
+		Content:   "test",
+		Timestamp: now,
+	}
+	if msg.Timestamp.IsZero() {
+		t.Error("Timestamp is zero, want time.Time")
+	}
+}
+
+func TestUnifiedMessage_EmptyContent(t *testing.T) {
+	msg := UnifiedMessage{
+		MessageID: "msg_1",
+		Channel:   "widget",
+		OpenID:    "u1",
+		Content:   "",
+	}
+	if msg.Content != "" {
+		t.Errorf("Content = %q, want empty", msg.Content)
+	}
+}
diff --git a/projects/ai-customer-service/internal/domain/ticketstats/stats_test.go b/projects/ai-customer-service/internal/domain/ticketstats/stats_test.go
new file mode 100644
index 00000000..a2def4ac
--- /dev/null
+++ b/projects/ai-customer-service/internal/domain/ticketstats/stats_test.go
@@ -0,0 +1,78 @@
+package ticketstats
+
+import "testing"
+
+func TestStats_Fields(t *testing.T) {
+	stats := Stats{
+		Total:                    100,
+		Open:                     30,
+		Resolved:                 50,
+		Closed:                   20,
+		ByChannel:                map[string]int{"widget": 60, "web": 40},
+		ByPriority:               map[string]int{"P1": 10, "P2": 30, "P3": 60},
+		HandoffCount:             5,
+		AvgResolutionTimeMinutes: 42.5,
+	}
+	if stats.Total != 100 {
+		t.Errorf("Total = %d, want 100", stats.Total)
+	}
+	if stats.Open != 30 {
+		t.Errorf("Open = %d, want 30", stats.Open)
+	}
+	if stats.Resolved != 50 {
+		t.Errorf("Resolved = %d, want 50", stats.Resolved)
+	}
+	if stats.Closed != 20 {
+		t.Errorf("Closed = %d, want 20", stats.Closed)
+	}
+	if stats.HandoffCount != 5 {
+		t.Errorf("HandoffCount = %d, want 5", stats.HandoffCount)
+	}
+	if stats.AvgResolutionTimeMinutes != 42.5 {
+		t.Errorf("AvgResolutionTimeMinutes = %f, want 42.5", stats.AvgResolutionTimeMinutes)
+	}
+}
+
+func TestStats_ByChannel(t *testing.T) {
+	stats := Stats{ByChannel: map[string]int{"widget": 10, "api": 20}}
+	if stats.ByChannel["widget"] != 10 {
+		t.Errorf("ByChannel[widget] = %d, want 10", stats.ByChannel["widget"])
+	}
+	if stats.ByChannel["api"] != 20 {
+		t.Errorf("ByChannel[api] = %d, want 20", stats.ByChannel["api"])
+	}
+}
+
+func TestStats_ByPriority(t *testing.T) {
+	stats := Stats{ByPriority: map[string]int{"P1": 5, "P2": 15, "P3": 80}}
+	if stats.ByPriority["P1"] != 5 {
+		t.Errorf("ByPriority[P1] = %d, want 5", stats.ByPriority["P1"])
+	}
+}
+
+func TestStats_ZeroValues(t *testing.T) {
+	stats := Stats{}
+	if stats.Total != 0 {
+		t.Errorf("Total = %d, want 0", stats.Total)
+	}
+	if stats.Open != 0 {
+		t.Errorf("Open = %d, want 0", stats.Open)
+	}
+	if stats.AvgResolutionTimeMinutes != 0 {
+		t.Errorf("AvgResolutionTimeMinutes = %f, want 0", stats.AvgResolutionTimeMinutes)
+	}
+	if stats.ByChannel != nil && len(stats.ByChannel) != 0 {
+		t.Errorf("ByChannel = %v, want nil or empty", stats.ByChannel)
+	}
+}
+
+func TestStats_NilMaps(t *testing.T) {
+	stats := Stats{Total: 0}
+	// ByChannel and ByPriority may be nil (zero value of map)
+	if stats.ByChannel == nil && len(stats.ByChannel) == 0 {
+		// nil map is valid
+	}
+	if stats.ByPriority == nil && len(stats.ByPriority) == 0 {
+		// nil map is valid
+	}
+}
diff --git a/projects/ai-customer-service/internal/platform/logging/logger_test.go b/projects/ai-customer-service/internal/platform/logging/logger_test.go
new file mode 100644
index 00000000..a7feaf8a
--- /dev/null
+++ b/projects/ai-customer-service/internal/platform/logging/logger_test.go
@@ -0,0 +1,42 @@
+package logging
+
+import (
+	"log/slog"
+	"testing"
+)
+
+func TestNew_ReturnsNonNil(t *testing.T) {
+	logger := New()
+	if logger == nil {
+		t.Fatal("New() returned nil")
+	}
+}
+
+func TestNew_ReturnsSlogLogger(t *testing.T) {
+	logger := New()
+	if logger == nil {
+		t.Fatal("logger is nil")
+	}
+	// Verify it's a *slog.Logger by using it
+	var _ *slog.Logger = logger
+}
+
+func TestNew_InfoLevel(t *testing.T) {
+	logger := New()
+	logger.Info("test info message")
+}
+
+func TestNew_WithAttr(t *testing.T) {
+	logger := New()
+	logger.Info("test with attrs", slog.String("key", "value"))
+}
+
+func TestNew_Error(t *testing.T) {
+	logger := New()
+	logger.Error("test error message")
+}
+
+func TestNew_Debug(t *testing.T) {
+	logger := New()
+	logger.Debug("test debug message")
+}
diff --git a/projects/ai-customer-service/internal/service/intent/service_test.go b/projects/ai-customer-service/internal/service/intent/service_test.go
new file mode 100644
index 00000000..a5d99ec2
--- /dev/null
+++ b/projects/ai-customer-service/internal/service/intent/service_test.go
@@ -0,0 +1,94 @@
+package intent
+
+import (
+	"context"
+	"testing"
+)
+
+func TestRecognize(t *testing.T) {
+	tests := []struct {
+		name    string
+		input   string
+		intent  string
+		handoff bool
+	}{
+		{name: "quota", input: "我的配额还剩多少", intent: "quota", handoff: false},
+		{name: "token", input: "今天 token 消耗是多少", intent: "token", handoff: false},
+		{name: "refund", input: "我要申请退款", intent: "refund", handoff: true},
+		{name: "security", input: "我的数据可能泄露了", intent: "security", handoff: true},
+		{name: "general_default", input: "你好", intent: "general", handoff: false},
+		{name: "error_keyword", input: "系统报错啦", intent: "error", handoff: false},
+		{name: "handoff_human", input: "转人工客服", intent: "handoff", handoff: true},
+		{name: "security_attack", input: "遭到攻击了", intent: "security", handoff: true},
+	}
+
+	svc := NewService()
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := svc.Recognize(context.Background(), "s1", tt.input, nil)
+			if err != nil {
+				t.Fatalf("Recognize() error = %v", err)
+			}
+			if got.Intent != tt.intent {
+				t.Fatalf("intent = %s, want %s", got.Intent, tt.intent)
+			}
+			if got.NeedsHuman != tt.handoff {
+				t.Fatalf("NeedsHuman = %v, want %v", got.NeedsHuman, tt.handoff)
+			}
+		})
+	}
+}
+
+func TestRecognize_GeneralIntent(t *testing.T) {
+	svc := NewService()
+	got, err := svc.Recognize(context.Background(), "s1", "今天天气不错", nil)
+	if err != nil {
+		t.Fatalf("Recognize() error = %v", err)
+	}
+	if got.Intent != "general" {
+		t.Errorf("intent = %s, want general", got.Intent)
+	}
+	if got.Confidence != 0.65 {
+		t.Errorf("Confidence = %f, want 0.65", got.Confidence)
+	}
+}
+
+func TestRecognize_CaseInsensitive(t *testing.T) {
+	svc := NewService()
+	got, err := svc.Recognize(context.Background(), "s1", "REFUND", nil)
+	if err != nil {
+		t.Fatalf("Recognize() error = %v", err)
+	}
+	if got.Intent != "refund" {
+		t.Errorf("intent = %s, want refund (case insensitive)", got.Intent)
+	}
+}
+
+func TestRecognize_WhitespaceTrimmed(t *testing.T) {
+	svc := NewService()
+	got, err := svc.Recognize(context.Background(), "s1", "  退款  ", nil)
+	if err != nil {
+		t.Fatalf("Recognize() error = %v", err)
+	}
+	if got.Intent != "refund" {
+		t.Errorf("intent = %s, want refund (whitespace trimmed)", got.Intent)
+	}
+}
+
+func TestContainsAny_Found(t *testing.T) {
+	if !containsAny("hello world", "world") {
+		t.Error("containsAny(hello world, world) = false, want true")
+	}
+}
+
+func TestContainsAny_NotFound(t *testing.T) {
+	if containsAny("hello world", "foo") {
+		t.Error("containsAny(hello world, foo) = true, want false")
+	}
+}
+
+func TestContainsAny_EmptyTerms(t *testing.T) {
+	if containsAny("hello", "world") {
+		t.Error("containsAny(hello, world) = true, want false")
+	}
+}