feat(model): LLM 多供应商适配（Adapter/OpenAI 非流式+SSE 流式/per-role 路由/主备降级/多模态检测/调用记录）

internal/runtime/model/router_test.go

@@ -0,0 +1,88 @@
+package model
+
+import "testing"
+
+func TestRouter_Route_PerRole(t *testing.T) {
+	t.Parallel()
+	r := NewRouter("default",
+		WithRoleModel(RoleUser, "user-model"),
+		WithRoleModel(RoleAssistant, "assistant-model"),
+		WithVisionModel("vision-model"),
+	)
+	cases := []struct {
+		role Role
+		want string
+	}{
+		{RoleUser, "user-model"},
+		{RoleAssistant, "assistant-model"},
+		{RoleSystem, "default"},
+		{Role("unknown"), "default"},
+	}
+	for _, c := range cases {
+		c := c
+		t.Run(string(c.role), func(t *testing.T) {
+			t.Parallel()
+			if got := r.Route(c.role); got != c.want {
+				t.Fatalf("Route(%q) = %q, want %q", c.role, got, c.want)
+			}
+		})
+	}
+}
+
+func TestRouter_RouteRequest_Text(t *testing.T) {
+	t.Parallel()
+	r := NewRouter("default",
+		WithRoleModel(RoleUser, "user-model"),
+		WithRoleModel(RoleAssistant, "assistant-model"),
+		WithVisionModel("vision-model"),
+	)
+	req := Request{Messages: []Message{TextMessage(RoleAssistant, "hi")}}
+	model, needsVision := r.RouteRequest(req)
+	if needsVision {
+		t.Errorf("needsVision = true, want false for text-only")
+	}
+	if model != "assistant-model" {
+		t.Errorf("model = %q, want assistant-model (last-message role)", model)
+	}
+}
+
+func TestRouter_RouteRequest_Vision(t *testing.T) {
+	t.Parallel()
+	r := NewRouter("default",
+		WithRoleModel(RoleUser, "user-model"),
+		WithVisionModel("vision-model"),
+	)
+	req := Request{Messages: []Message{ImageMessage(RoleUser, "", "data:image/png;base64,abc")}}
+	model, needsVision := r.RouteRequest(req)
+	if !needsVision {
+		t.Errorf("needsVision = false, want true for image content")
+	}
+	if model != "vision-model" {
+		t.Errorf("model = %q, want vision-model", model)
+	}
+}
+
+func TestRouter_RouteRequest_VisionUnconfigured(t *testing.T) {
+	t.Parallel()
+	r := NewRouter("default", WithRoleModel(RoleUser, "user-model"))
+	req := Request{Messages: []Message{ImageMessage(RoleUser, "", "data:image/png;base64,abc")}}
+	model, needsVision := r.RouteRequest(req)
+	if !needsVision {
+		t.Errorf("needsVision = false, want true when image present even without a vision model")
+	}
+	if model != "user-model" {
+		t.Errorf("model = %q, want user-model (role fallback)", model)
+	}
+}
+
+func TestRouter_RouteRequest_EmptyMessages(t *testing.T) {
+	t.Parallel()
+	r := NewRouter("default", WithRoleModel(RoleUser, "user-model"))
+	model, needsVision := r.RouteRequest(Request{})
+	if needsVision {
+		t.Errorf("needsVision = true, want false")
+	}
+	if model != "user-model" {
+		t.Errorf("model = %q, want user-model (default role for empty messages)", model)
+	}
+}