r, err := NewReader(context.Background(), bytes.NewReader([]byte("abcd")), 4, "e2fc714c4727ee9395f324cd2e7f331f", "88d4266fd4e6338d13b845fcf289579d209c897823b9217da3e161936f031589", 4)
	if err != nil {
		t.Fatal(err)
	}
	_, err = io.Copy(io.Discard, r)
	if err != nil {
		t.Fatal(err)
	}
	md5sum := r.MD5Current()
	if hex.EncodeToString(md5sum) != "e2fc714c4727ee9395f324cd2e7f331f" {

		{bucketNames[2], objectNames[4], uploadIDs[8], 1, "abcd", "e2fc714c4727ee9395f324cd2e7f331f", int64(len("abcd")), "e2fc714c4727ee9395f324cd2e7f331f"},
		{bucketNames[2], objectNames[5], uploadIDs[9], 1, "abcd", "e2fc714c4727ee9395f324cd2e7f331f", int64(len("abcd")), "e2fc714c4727ee9395f324cd2e7f331f"},
	}
	sha256sum := ""

		8: {
			bucketName: bucket, objName: object, inputData: []byte("abcd"),
			inputMeta: map[string]string{"etag": "e2fc714c4727ee9395f324cd2e7f331e"}, inputDataSize: int64(len("abcd") + 1),
			expectedError: hash.BadDigest{ExpectedMD5: "e2fc714c4727ee9395f324cd2e7f331e", CalculatedMD5: "e2fc714c4727ee9395f324cd2e7f331f"},
		},

		// Input with size less than the size of actual data inside the reader.
		9: {

		// should error out with part too small.
		{
			[]CompletePart{
				{ETag: "e2fc714c4727ee9395f324cd2e7f331f", PartNumber: 1},
				{ETag: "1f7690ebdd9b4caf8fab49ca1757bf27", PartNumber: 2},
			},
		},
		// inputParts - 2.
		// Case with invalid Part number.
		{
			[]CompletePart{
				{ETag: "e2fc714c4727ee9395f324cd2e7f331f", PartNumber: 10},
			},
		},
		// inputParts - 3.