feat(llm): anthropic vision provider (audio unsupported)

internal/llm/anthropic_test.go

@@ -0,0 +1,49 @@
+package llm
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestAnthropicVision(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/v1/messages" {
+			t.Errorf("path %s", r.URL.Path)
+		}
+		if r.Header.Get("x-api-key") != "key" || r.Header.Get("anthropic-version") != "2023-06-01" {
+			t.Errorf("headers %v", r.Header)
+		}
+		raw, _ := io.ReadAll(r.Body)
+		if strings.Contains(string(raw), "temperature") {
+			t.Errorf("temperature must NOT be sent to anthropic: %s", raw)
+		}
+		if !strings.Contains(string(raw), `"type":"base64"`) {
+			t.Errorf("image block missing: %s", raw)
+		}
+		_, _ = io.WriteString(w, `{"content":[{"type":"text","text":"crosswalk"}]}`)
+	}))
+	defer srv.Close()
+
+	c := &anthropicClient{http: &http.Client{Timeout: 5 * time.Second}, base: srv.URL, key: "key", model: "claude-opus-4-8", maxTokens: 100}
+	got, err := c.Vision(context.Background(), "which tiles", []Image{{MediaType: "image/png", Data: []byte{2}}}, Options{Temperature: 0.7})
+	if err != nil || got != "crosswalk" {
+		t.Fatalf("got %q err %v", got, err)
+	}
+	_ = json.Marshal // keep import
+}
+
+func TestAnthropicTranscribeUnsupported(t *testing.T) {
+	c := &anthropicClient{model: "claude-opus-4-8"}
+	_, err := c.Transcribe(context.Background(), []byte{1}, "a.mp3", Options{})
+	var u ErrUnsupported
+	if !errors.As(err, &u) {
+		t.Fatalf("want ErrUnsupported, got %v", err)
+	}
+}