atree/math_utils_test.go at main · onflow/atree · GitHub

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/*
 * Atree - Scalable Arrays and Ordered Maps
 *
 * Copyright Flow Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package atree

import (
	"math"
	"testing"

	"github.com/stretchr/testify/require"
)

func TestSafeAdd2Uint32(t *testing.T) {
	t.Parallel()

	t.Run("safe", func(t *testing.T) {
		sum, safe := safeAdd2Uint32(1, 2)
		require.True(t, safe)
		require.Equal(t, uint32(3), sum)

		sum, safe = safeAdd2Uint32(1, math.MaxUint32-1)
		require.True(t, safe)
		require.Equal(t, uint32(math.MaxUint32), sum)

		sum, safe = safeAdd2Uint32(math.MaxUint32-1, 1)
		require.True(t, safe)
		require.Equal(t, uint32(math.MaxUint32), sum)
	})

	t.Run("not safe", func(t *testing.T) {
		_, safe := safeAdd2Uint32(1, math.MaxUint32)
		require.False(t, safe)

		_, safe = safeAdd2Uint32(math.MaxUint32, 1)
		require.False(t, safe)

		_, safe = safeAdd2Uint32(2, math.MaxUint32-1)
		require.False(t, safe)
	})
}

func TestSafeAdd3Uint32(t *testing.T) {
	t.Parallel()

	t.Run("safe", func(t *testing.T) {
		sum, safe := safeAdd3Uint32(1, 2, 3)
		require.True(t, safe)
		require.Equal(t, uint32(6), sum)

		sum, safe = safeAdd3Uint32(1, 1, math.MaxUint32-2)
		require.True(t, safe)
		require.Equal(t, uint32(math.MaxUint32), sum)

		sum, safe = safeAdd3Uint32(1, math.MaxUint32-2, 1)
		require.True(t, safe)
		require.Equal(t, uint32(math.MaxUint32), sum)

		sum, safe = safeAdd3Uint32(math.MaxUint32-2, 1, 1)
		require.True(t, safe)
		require.Equal(t, uint32(math.MaxUint32), sum)
	})

	t.Run("not safe", func(t *testing.T) {
		_, safe := safeAdd3Uint32(1, 1, math.MaxUint32-1)
		require.False(t, safe)

		_, safe = safeAdd3Uint32(1, math.MaxUint32-1, 1)
		require.False(t, safe)

		_, safe = safeAdd3Uint32(math.MaxUint32-1, 1, 1)
		require.False(t, safe)
	})
}