Sub2API v1.0 - AI API 网关（二开初始版本，基于上游 Wei-Shaw/sub2api）

backend/internal/pkg/apicompat/chatcompletions_reasoning_alias_test.go

@@ -0,0 +1,76 @@
+package apicompat
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func readIssue5302Fixture(t *testing.T, name string, dst any) {
+	t.Helper()
+	payload, err := os.ReadFile(filepath.Join("testdata", "issue5302", name))
+	require.NoError(t, err)
+	require.NoError(t, json.Unmarshal(payload, dst))
+}
+
+func TestChatReasoningAlias_AnthropicNonStreaming(t *testing.T) {
+	var response ChatCompletionsResponse
+	readIssue5302Fixture(t, "nonstream_reasoning.json", &response)
+
+	out := ChatCompletionsResponseToAnthropic(&response, "claude-sonnet-4-20250514")
+	require.Len(t, out.Content, 2)
+	require.Equal(t, "thinking", out.Content[0].Type)
+	require.Equal(t, "fallback reasoning", out.Content[0].Thinking)
+	require.Equal(t, "final answer", out.Content[1].Text)
+}
+
+func TestChatReasoningAlias_AnthropicStreaming(t *testing.T) {
+	var chunk ChatCompletionsChunk
+	readIssue5302Fixture(t, "stream_reasoning.json", &chunk)
+
+	events := ChatCompletionsChunkToAnthropicEvents(&chunk, NewChatCompletionsToAnthropicStreamState("reasoning-model"))
+	var thinking string
+	for _, event := range events {
+		if event.Delta != nil && event.Delta.Type == "thinking_delta" {
+			thinking += event.Delta.Thinking
+		}
+	}
+	require.Equal(t, "streamed fallback", thinking)
+}
+
+func TestChatReasoningAlias_ResponsesSharedPaths(t *testing.T) {
+	var response ChatCompletionsResponse
+	readIssue5302Fixture(t, "nonstream_reasoning.json", &response)
+	nonStream := ChatCompletionsResponseToResponses(&response, "reasoning-model", nil, false, nil)
+	require.Len(t, nonStream.Output, 2)
+	require.Equal(t, "reasoning", nonStream.Output[0].Type)
+	require.Equal(t, "fallback reasoning", nonStream.Output[0].Summary[0].Text)
+
+	var chunk ChatCompletionsChunk
+	readIssue5302Fixture(t, "stream_reasoning.json", &chunk)
+	events := ChatCompletionsChunkToResponsesEvents(&chunk, NewChatCompletionsToResponsesStreamState("reasoning-model"))
+	var deltas []string
+	for _, event := range events {
+		if event.Type == "response.reasoning_summary_text.delta" {
+			deltas = append(deltas, event.Delta)
+		}
+	}
+	require.Equal(t, []string{"streamed fallback"}, deltas)
+}
+
+func TestChatReasoningAlias_ReasoningContentTakesPrecedence(t *testing.T) {
+	var chunk ChatCompletionsChunk
+	readIssue5302Fixture(t, "reasoning_content_precedence.json", &chunk)
+
+	events := ChatCompletionsChunkToResponsesEvents(&chunk, NewChatCompletionsToResponsesStreamState("reasoning-model"))
+	var deltas []string
+	for _, event := range events {
+		if event.Type == "response.reasoning_summary_text.delta" {
+			deltas = append(deltas, event.Delta)
+		}
+	}
+	require.Equal(t, []string{"preferred reasoning"}, deltas)
+}