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

backend/cmd/profit-preview/main_test.go

@@ -0,0 +1,92 @@
+package main
+
+import (
+	"testing"
+	"time"
+
+	"github.com/Wei-Shaw/sub2api/internal/service"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParsePreviewInputsIgnoresNullUserOverride(t *testing.T) {
+	raw := []byte(`{
+		"groups": [{
+			"group": {
+				"id": 50,
+				"name": "preview",
+				"platform": "openai",
+				"rate_multiplier": 0.5,
+				"subscription_type": "standard",
+				"profit_control_enabled": false,
+				"profit_min_margin": 0.1,
+				"profit_safety_buffer": 0
+			},
+			"accounts": [{
+				"id": 1,
+				"name": "cheap",
+				"platform": "openai",
+				"type": "apikey",
+				"rate_multiplier": 0.2
+			}],
+			"user_overrides": {"40": null, "41": 0.4},
+			"models": ["gpt-test"]
+		}]
+	}`)
+
+	inputs, err := parsePreviewInputs(raw, true)
+	require.NoError(t, err)
+	require.Len(t, inputs, 1)
+	require.Equal(t, map[int64]float64{41: 0.4}, inputs[0].UserOverrides)
+	require.True(t, inputs[0].AssumeEnabled)
+
+	report := service.PreviewProfitAdmission(inputs, time.Date(2026, 1, 15, 8, 30, 0, 0, time.UTC))[0]
+	require.InDelta(t, 0.4, report.MinEffectiveD, 1e-12, "null 覆盖不能被解码成 0 倍率")
+	require.InDelta(t, 0.36, report.ThresholdMinD, 1e-12)
+}
+
+func TestParsePreviewInputsRejectsEmptyGroups(t *testing.T) {
+	for _, raw := range [][]byte{
+		[]byte(`{"groups":null}`),
+		[]byte(`{"groups":[]}`),
+	} {
+		inputs, err := parsePreviewInputs(raw, false)
+		require.ErrorContains(t, err, "input contains no groups")
+		require.Nil(t, inputs)
+	}
+}
+
+// TestModelsWithZeroRemainingWarnings 钉死两档 D 的归零告警分工：
+// 默认 D 归零由 modelsWithZeroRemaining 报告；默认 D 仍有账号但最低有效 D
+// （分组内存在更低的用户级倍率覆盖）归零的模型必须单独告警——那些用户的该
+// 模型会全黑，只看默认 D 完全看不出来。两档都为 0 时不重复告警。
+func TestModelsWithZeroRemainingWarnings(t *testing.T) {
+	report := service.ProfitPreviewGroupReport{
+		RemainingByModel: map[string]int{
+			"both-zero":      0,
+			"min-d-zero":     2,
+			"healthy":        3,
+			"min-d-zero-alt": 1,
+		},
+		RemainingByModelMinD: map[string]int{
+			"both-zero":      0,
+			"min-d-zero":     0,
+			"healthy":        3,
+			"min-d-zero-alt": 0,
+		},
+	}
+
+	if got := modelsWithZeroRemaining(report); len(got) != 1 || got[0] != "both-zero" {
+		t.Fatalf("默认D归零告警应只覆盖 both-zero，got %v", got)
+	}
+
+	got := modelsWithZeroRemainingUnderMinD(report)
+	want := []string{"min-d-zero", "min-d-zero-alt"}
+	if len(got) != len(want) {
+		t.Fatalf("最低有效D归零告警不符: got %v want %v", got, want)
+	}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("最低有效D归零告警不符（应按模型名排序）: got %v want %v", got, want)
+		}
+	}
+}