moved unit test

token/internal/parse/parse_test.go

@@ -0,0 +1,64 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"github.com/ucan-wg/go-ucan/pkg/policy/limits"
+)
+
+func TestOptionalTimestamp(t *testing.T) {
+	tests := []struct {
+		name    string
+		input   *int64
+		wantErr bool
+	}{
+		{
+			name:    "nil timestamp",
+			input:   nil,
+			wantErr: false,
+		},
+		{
+			name:    "valid timestamp",
+			input:   int64Ptr(1625097600),
+			wantErr: false,
+		},
+		{
+			name:    "max safe integer",
+			input:   int64Ptr(limits.MaxInt53),
+			wantErr: false,
+		},
+		{
+			name:    "exceeds max safe integer",
+			input:   int64Ptr(limits.MaxInt53 + 1),
+			wantErr: true,
+		},
+		{
+			name:    "below min safe integer",
+			input:   int64Ptr(limits.MinInt53 - 1),
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result, err := OptionalTimestamp(tt.input)
+			if tt.wantErr {
+				require.Error(t, err)
+				require.Contains(t, err.Error(), "exceeds safe integer bounds")
+				require.Nil(t, result)
+			} else {
+				require.NoError(t, err)
+				if tt.input == nil {
+					require.Nil(t, result)
+				} else {
+					require.NotNil(t, result)
+				}
+			}
+		})
+	}
+}
+
+func int64Ptr(i int64) *int64 {
+	return &i
+}