[#365] settlement/basic: Implement asset distribution

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/innerring/processors/settlement/basic/distribute_test.go

@@ -0,0 +1,54 @@
+package basic
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+type normalizedValueCase struct {
+	name            string
+	n, total, limit uint64
+	expected        uint64
+}
+
+func TestNormalizedValues(t *testing.T) {
+	testCases := []normalizedValueCase{
+		{
+			name:     "zero limit",
+			n:        50,
+			total:    100,
+			limit:    0,
+			expected: 0,
+		},
+		{
+			name:     "scale down",
+			n:        50,
+			total:    100,
+			limit:    10,
+			expected: 5,
+		},
+		{
+			name:     "scale up",
+			n:        50,
+			total:    100,
+			limit:    1000,
+			expected: 500,
+		},
+	}
+
+	for _, testCase := range testCases {
+		testNormalizedValues(t, testCase)
+	}
+}
+
+func testNormalizedValues(t *testing.T, c normalizedValueCase) {
+	n := new(big.Int).SetUint64(c.n)
+	total := new(big.Int).SetUint64(c.total)
+	limit := new(big.Int).SetUint64(c.limit)
+	exp := new(big.Int).SetUint64(c.expected)
+
+	got := normalizedValue(n, total, limit)
+	require.Zero(t, exp.Cmp(got), c.name)
+}