diff --git a/extern/sector-storage/piece_provider_test.go b/extern/sector-storage/piece_provider_test.go
new file mode 100644
index 000000000..08aadb78e
--- /dev/null
+++ b/extern/sector-storage/piece_provider_test.go
@@ -0,0 +1,118 @@
+package sectorstorage
+
+import (
+	"context"
+	"io/ioutil"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/filecoin-project/go-state-types/abi"
+	"github.com/filecoin-project/go-statestore"
+	specstorage "github.com/filecoin-project/specs-storage/storage"
+	"github.com/ipfs/go-datastore"
+	"github.com/ipfs/go-datastore/namespace"
+	ds_sync "github.com/ipfs/go-datastore/sync"
+	"github.com/stretchr/testify/require"
+
+	"github.com/filecoin-project/lotus/extern/sector-storage/sealtasks"
+	"github.com/filecoin-project/lotus/extern/sector-storage/stores"
+	"github.com/filecoin-project/lotus/extern/sector-storage/storiface"
+)
+
+// TestPieceProviderReadPiece verifies that the ReadPiece method works correctly
+func TestPieceProviderReadPiece(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
+	defer cancel()
+
+	runTest := func(t *testing.T, alreadyUnsealed bool) {
+		// Set up sector storage manager
+		storage := newTestStorage(t)
+		index := stores.NewIndex()
+		localStore, err := stores.NewLocal(ctx, storage, index, nil)
+		require.NoError(t, err)
+		remoteStore := stores.NewRemote(localStore, index, nil, 6000)
+		dstore := ds_sync.MutexWrap(datastore.NewMapDatastore())
+		wsts := statestore.New(namespace.Wrap(dstore, datastore.NewKey("/worker/calls")))
+		smsts := statestore.New(namespace.Wrap(dstore, datastore.NewKey("/stmgr/calls")))
+		sealerCfg := SealerConfig{
+			ParallelFetchLimit: 10,
+			AllowAddPiece:      true,
+			AllowPreCommit1:    true,
+			AllowPreCommit2:    true,
+			AllowCommit:        true,
+			AllowUnseal:        true,
+		}
+		mgr, err := New(ctx, localStore, remoteStore, storage, index, sealerCfg, wsts, smsts)
+		require.NoError(t, err)
+
+		// Set up worker
+		localTasks := []sealtasks.TaskType{
+			sealtasks.TTAddPiece, sealtasks.TTPreCommit1, sealtasks.TTCommit1, sealtasks.TTFinalize, sealtasks.TTFetch,
+		}
+		testWorker := newTestWorker(WorkerConfig{
+			TaskTypes: localTasks,
+		}, localStore, mgr)
+		err = mgr.AddWorker(ctx, testWorker)
+		require.NoError(t, err)
+
+		// Create piece provider
+		pp := NewPieceProvider(remoteStore, index, mgr)
+
+		// Mock sector
+		sector := specstorage.SectorRef{
+			ID: abi.SectorID{
+				Miner:  1000,
+				Number: 1,
+			},
+			ProofType: abi.RegisteredSealProof_StackedDrg8MiBV1,
+		}
+
+		// Create some data that when padded will be 8MB
+		pieceData := strings.Repeat("testthis", 127*1024*8)
+		size := abi.UnpaddedPieceSize(len(pieceData))
+		pieceInfo, err := mgr.AddPiece(ctx, sector, nil, size, strings.NewReader(pieceData))
+		require.NoError(t, err)
+
+		// pre-commit 1
+		pieces := []abi.PieceInfo{pieceInfo}
+		ticket := abi.SealRandomness{9, 9, 9, 9, 9, 9, 9, 9}
+		preCommit1, err := mgr.SealPreCommit1(ctx, sector, ticket, pieces)
+		require.NoError(t, err)
+
+		// pre-commit 2
+		sectorCids, err := mgr.SealPreCommit2(ctx, sector, preCommit1)
+		require.NoError(t, err)
+		commD := sectorCids.Unsealed
+
+		// If we want to test what happens when the data must be unsealed
+		// (ie there is not an unsealed copy already available)
+		if !alreadyUnsealed {
+			// Remove the unsealed copy from local storage
+			err = localStore.Remove(ctx, sector.ID, storiface.FTUnsealed, false)
+			require.NoError(t, err)
+		}
+
+		// Read the piece
+		offset := storiface.UnpaddedByteIndex(0)
+		require.NoError(t, err)
+		reader, unsealed, err := pp.ReadPiece(ctx, sector, offset, size, ticket, commD)
+		require.NoError(t, err)
+		requiresUnseal := !alreadyUnsealed
+		require.Equal(t, requiresUnseal, unsealed)
+
+		defer func() { _ = reader.Close() }()
+
+		// Make sure the input matches the output
+		readData, err := ioutil.ReadAll(reader)
+		require.NoError(t, err)
+		require.Equal(t, pieceData, string(readData))
+	}
+
+	t.Run("already unsealed", func(t *testing.T) {
+		runTest(t, true)
+	})
+	t.Run("requires unseal", func(t *testing.T) {
+		runTest(t, false)
+	})
+}