consensus: move test use only var/func to test(#17004)

consensus/ethash/algorithm_test.go

@@ -18,6 +18,7 @@ package ethash
 
 import (
 	"bytes"
+	"encoding/binary"
 	"io/ioutil"
 	"math/big"
 	"os"
@@ -30,6 +31,15 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 )
 
+// prepare converts an ethash cache or dataset from a byte stream into the internal
+// int representation. All ethash methods work with ints to avoid constant byte to
+// int conversions as well as to handle both little and big endian systems.
+func prepare(dest []uint32, src []byte) {
+	for i := 0; i < len(dest); i++ {
+		dest[i] = binary.LittleEndian.Uint32(src[i*4:])
+	}
+}
+
 // Tests whether the dataset size calculator works correctly by cross checking the
 // hard coded lookup table with the value generated by it.
 func TestSizeCalculations(t *testing.T) {