chore: export GenerateRandomBlobOfShareCount (#1623)

Closes #1622

pkg/shares/sparse_shares_test.go

@@ -11,7 +11,7 @@ import (
 )
 
 func TestSparseShareContainsInfoByte(t *testing.T) {
-	blob := generateRandomBlobOfShareCount(4)
+	blob := testfactory.GenerateRandomBlobOfShareCount(4)
 
 	sequenceStartInfoByte, err := NewInfoByte(appconsts.ShareVersionZero, true)
 	require.NoError(t, err)
@@ -59,17 +59,17 @@ func TestSparseShareSplitterCount(t *testing.T) {
 	testCases := []testCase{
 		{
 			name:     "one share",
-			blob:     generateRandomBlobOfShareCount(1),
+			blob:     testfactory.GenerateRandomBlobOfShareCount(1),
 			expected: 1,
 		},
 		{
 			name:     "two shares",
-			blob:     generateRandomBlobOfShareCount(2),
+			blob:     testfactory.GenerateRandomBlobOfShareCount(2),
 			expected: 2,
 		},
 		{
 			name:     "ten shares",
-			blob:     generateRandomBlobOfShareCount(10),
+			blob:     testfactory.GenerateRandomBlobOfShareCount(10),
 			expected: 10,
 		},
 	}
@@ -84,17 +84,3 @@ func TestSparseShareSplitterCount(t *testing.T) {
 		})
 	}
 }
-
-// generateRandomBlobOfShareCount returns a blob that spans the given
-// number of shares
-func generateRandomBlobOfShareCount(count int) coretypes.Blob {
-	size := rawBlobSize(appconsts.FirstSparseShareContentSize * count)
-	return testfactory.GenerateRandomBlob(size)
-}
-
-// rawBlobSize returns the raw blob size that can be used to construct a
-// blob of totalSize bytes. This function is useful in tests to account for
-// the delimiter length that is prefixed to a blob's data.
-func rawBlobSize(totalSize int) int {
-	return totalSize - DelimLen(uint64(totalSize))
-}

testutil/testfactory/blob.go

@@ -2,6 +2,7 @@ package testfactory
 
 import (
 	"bytes"
+	"encoding/binary"
 	"sort"
 
 	"github.com/celestiaorg/celestia-app/pkg/appconsts"
@@ -57,3 +58,23 @@ func GenerateRandomBlob(dataSize int) types.Blob {
 	}
 	return blob
 }
+
+// GenerateRandomBlobOfShareCount returns a blob that spans the given
+// number of shares
+func GenerateRandomBlobOfShareCount(count int) types.Blob {
+	size := rawBlobSize(appconsts.FirstSparseShareContentSize * count)
+	return GenerateRandomBlob(size)
+}
+
+// rawBlobSize returns the raw blob size that can be used to construct a
+// blob of totalSize bytes. This function is useful in tests to account for
+// the delimiter length that is prefixed to a blob's data.
+func rawBlobSize(totalSize int) int {
+	return totalSize - DelimLen(uint64(totalSize))
+}
+
+// DelimLen calculates the length of the delimiter for a given unit size
+func DelimLen(size uint64) int {
+	lenBuf := make([]byte, binary.MaxVarintLen64)
+	return binary.PutUvarint(lenBuf, size)
+}