feat(errs): AppError type with HTTP status mapping

internal/infra/errs/errs_test.go

@@ -0,0 +1,45 @@
+package errs
+
+import (
+	"errors"
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestNew_BasicShape(t *testing.T) {
+	e := New(CodeInvalidInput, "字段缺失")
+	require.Equal(t, CodeInvalidInput, e.Code)
+	require.Equal(t, "字段缺失", e.Message)
+	require.Nil(t, e.Cause)
+}
+
+func TestWithFields(t *testing.T) {
+	e := New(CodeInvalidInput, "x").WithFields(map[string]any{"name": "required"})
+	require.Equal(t, "required", e.Fields["name"])
+}
+
+func TestWrap_PreservesCause(t *testing.T) {
+	cause := errors.New("boom")
+	e := Wrap(cause, CodeInternal, "wrapped")
+	require.ErrorIs(t, e, cause)
+	require.Equal(t, "wrapped: boom", e.Error())
+}
+
+func TestHTTPStatus(t *testing.T) {
+	cases := map[Code]int{
+		CodeInvalidInput: http.StatusBadRequest,
+		CodeUnauthorized: http.StatusUnauthorized,
+		CodeForbidden:    http.StatusForbidden,
+		CodeNotFound:     http.StatusNotFound,
+		CodeConflict:     http.StatusConflict,
+		CodeRateLimited:  http.StatusTooManyRequests,
+		CodeUpstream:     http.StatusBadGateway,
+		CodeUnavailable:  http.StatusServiceUnavailable,
+		CodeInternal:     http.StatusInternalServerError,
+	}
+	for code, want := range cases {
+		require.Equal(t, want, HTTPStatus(code), "code=%s", code)
+	}
+}