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/model_test.go

@@ -0,0 +1,56 @@
+package model
+
+import "testing"
+
+func TestTextMessage(t *testing.T) {
+	t.Parallel()
+	msg := TextMessage(RoleUser, "hi")
+	if msg.Role != RoleUser {
+		t.Fatalf("role = %q, want %q", msg.Role, RoleUser)
+	}
+	if len(msg.Content) != 1 || msg.Content[0].Type != ContentTypeText || msg.Content[0].Text != "hi" {
+		t.Fatalf("content = %+v, want a single text part", msg.Content)
+	}
+}
+
+func TestImageMessage(t *testing.T) {
+	t.Parallel()
+	msg := ImageMessage(RoleUser, "look", "data:image/png;base64,abc")
+	if len(msg.Content) != 2 {
+		t.Fatalf("content len = %d, want 2 (text + image)", len(msg.Content))
+	}
+	if msg.Content[1].Type != ContentTypeImage || msg.Content[1].ImageURL != "data:image/png;base64,abc" {
+		t.Fatalf("image part = %+v", msg.Content[1])
+	}
+}
+
+func TestImageMessage_NoText(t *testing.T) {
+	t.Parallel()
+	msg := ImageMessage(RoleUser, "", "data:image/png;base64,abc")
+	if len(msg.Content) != 1 || msg.Content[0].Type != ContentTypeImage {
+		t.Fatalf("content = %+v, want a single image part", msg.Content)
+	}
+}
+
+func TestHasImage(t *testing.T) {
+	t.Parallel()
+	cases := []struct {
+		name string
+		msgs []Message
+		want bool
+	}{
+		{"empty", nil, false},
+		{"text only", []Message{TextMessage(RoleUser, "hi")}, false},
+		{"image", []Message{ImageMessage(RoleUser, "", "data:image/png;base64,x")}, true},
+		{"text and image", []Message{ImageMessage(RoleUser, "desc", "data:image/png;base64,x")}, true},
+	}
+	for _, c := range cases {
+		c := c
+		t.Run(c.name, func(t *testing.T) {
+			t.Parallel()
+			if got := HasImage(c.msgs); got != c.want {
+				t.Fatalf("HasImage = %v, want %v", got, c.want)
+			}
+		})
+	}
+}