diff --git a/test/__snapshots__/indexedfile.test.ts.snap b/test/__snapshots__/indexedfile.test.ts.snap
index 9a830e93..f7ec70ca 100644
--- a/test/__snapshots__/indexedfile.test.ts.snap
+++ b/test/__snapshots__/indexedfile.test.ts.snap
@@ -1677767,3 +1677767,414 @@ exports[`cram31 returns the correct sequence 1`] = `
   "uniqueId": 843,
 }
 `;
+
+exports[`match samtools matches names given from samtools 1`] = `
+[
+  "SRR396636.sra.82183",
+  "SRR396636.sra.897624",
+  "SRR396636.sra.626822",
+  "SRR396636.sra.38901",
+  "SRR396636.sra.674403",
+  "SRR396636.sra.1045612",
+  "SRR396636.sra.181279",
+  "SRR396636.sra.1715745",
+  "SRR396636.sra.1270900",
+  "SRR396636.sra.1013691",
+  "SRR396636.sra.1896022",
+  "SRR396636.sra.429808",
+  "SRR396636.sra.258066",
+  "SRR396636.sra.1310919",
+  "SRR396636.sra.1516521",
+  "SRR396636.sra.627892",
+  "SRR396636.sra.1264342",
+  "SRR396636.sra.7233",
+  "SRR396636.sra.322327",
+  "SRR396636.sra.1205063",
+  "SRR396636.sra.1117231",
+  "SRR396636.sra.894750",
+  "SRR396636.sra.1038930",
+  "SRR396636.sra.797353",
+  "SRR396636.sra.1904614",
+  "SRR396636.sra.1457591",
+  "SRR396636.sra.1447376",
+  "SRR396636.sra.355219",
+  "SRR396636.sra.384351",
+  "SRR396636.sra.1369540",
+  "SRR396636.sra.579503",
+  "SRR396636.sra.1077317",
+  "SRR396636.sra.1902087",
+  "SRR396636.sra.854866",
+  "SRR396636.sra.57286",
+  "SRR396636.sra.157168",
+  "SRR396636.sra.499633",
+  "SRR396636.sra.1384320",
+  "SRR396636.sra.706630",
+  "SRR396636.sra.499413",
+  "SRR396636.sra.986656",
+  "SRR396636.sra.386408",
+  "SRR396636.sra.1181765",
+  "SRR396636.sra.554738",
+  "SRR396636.sra.1227954",
+  "SRR396636.sra.1258806",
+  "SRR396636.sra.1904868",
+  "SRR396636.sra.503628",
+  "SRR396636.sra.20257",
+  "SRR396636.sra.746474",
+  "SRR396636.sra.768749",
+  "SRR396636.sra.1132315",
+  "SRR396636.sra.1622784",
+  "SRR396636.sra.145453",
+  "SRR396636.sra.941096",
+  "SRR396636.sra.1378694",
+  "SRR396636.sra.1615098",
+  "SRR396636.sra.375245",
+  "SRR396636.sra.779088",
+  "SRR396636.sra.1594803",
+  "SRR396636.sra.967117",
+  "SRR396636.sra.1524854",
+  "SRR396636.sra.1900379",
+  "SRR396636.sra.494829",
+  "SRR396636.sra.163376",
+  "SRR396636.sra.185254",
+  "SRR396636.sra.875667",
+  "SRR396636.sra.339294",
+  "SRR396636.sra.1301555",
+  "SRR396636.sra.1020804",
+  "SRR396636.sra.1886241",
+  "SRR396636.sra.3440",
+  "SRR396636.sra.92342",
+  "SRR396636.sra.683693",
+  "SRR396636.sra.1468441",
+  "SRR396636.sra.347785",
+  "SRR396636.sra.529657",
+  "SRR396636.sra.805621",
+  "SRR396636.sra.449965",
+  "SRR396636.sra.1466709",
+  "SRR396636.sra.1460498",
+  "SRR396636.sra.779088",
+  "SRR396636.sra.1350724",
+  "SRR396636.sra.108415",
+  "SRR396636.sra.33595",
+  "SRR396636.sra.1206201",
+  "SRR396636.sra.1366178",
+  "SRR396636.sra.158295",
+  "SRR396636.sra.1731503",
+  "SRR396636.sra.965960",
+  "SRR396636.sra.1048829",
+  "SRR396636.sra.1293219",
+  "SRR396636.sra.247052",
+  "SRR396636.sra.933930",
+  "SRR396636.sra.977222",
+  "SRR396636.sra.753395",
+  "SRR396636.sra.1446590",
+  "SRR396636.sra.323523",
+  "SRR396636.sra.1425241",
+  "SRR396636.sra.793919",
+  "SRR396636.sra.1591209",
+  "SRR396636.sra.1089164",
+  "SRR396636.sra.1398448",
+  "SRR396636.sra.951100",
+  "SRR396636.sra.706207",
+  "SRR396636.sra.1289307",
+  "SRR396636.sra.329741",
+  "SRR396636.sra.1129332",
+  "SRR396636.sra.427074",
+  "SRR396636.sra.1341450",
+  "SRR396636.sra.72531",
+  "SRR396636.sra.559197",
+  "SRR396636.sra.782767",
+  "SRR396636.sra.373928",
+  "SRR396636.sra.283245",
+  "SRR396636.sra.985901",
+  "SRR396636.sra.516962",
+  "SRR396636.sra.1049918",
+  "SRR396636.sra.1194537",
+  "SRR396636.sra.373043",
+  "SRR396636.sra.1023067",
+  "SRR396636.sra.882593",
+  "SRR396636.sra.917674",
+  "SRR396636.sra.1382503",
+  "SRR396636.sra.44141",
+  "SRR396636.sra.511322",
+  "SRR396636.sra.1610735",
+  "SRR396636.sra.1343288",
+  "SRR396636.sra.1735551",
+  "SRR396636.sra.142184",
+  "SRR396636.sra.264857",
+  "SRR396636.sra.349946",
+  "SRR396636.sra.1032269",
+  "SRR396636.sra.240435",
+  "SRR396636.sra.1089726",
+  "SRR396636.sra.1642729",
+  "SRR396636.sra.339294",
+  "SRR396636.sra.1615715",
+  "SRR396636.sra.928385",
+  "SRR396636.sra.1359722",
+  "SRR396636.sra.1804592",
+  "SRR396636.sra.318982",
+  "SRR396636.sra.99831",
+  "SRR396636.sra.598913",
+  "SRR396636.sra.1180771",
+  "SRR396636.sra.692962",
+  "SRR396636.sra.401865",
+  "SRR396636.sra.935470",
+  "SRR396636.sra.573409",
+  "SRR396636.sra.1777324",
+  "SRR396636.sra.650830",
+  "SRR396636.sra.1807284",
+  "SRR396636.sra.330478",
+  "SRR396636.sra.1903640",
+  "SRR396636.sra.33736",
+  "SRR396636.sra.1265853",
+  "SRR396636.sra.457062",
+  "SRR396636.sra.1682553",
+  "SRR396636.sra.617591",
+  "SRR396636.sra.1415368",
+  "SRR396636.sra.1101137",
+  "SRR396636.sra.678281",
+  "SRR396636.sra.863843",
+  "SRR396636.sra.1064897",
+  "SRR396636.sra.1424541",
+  "SRR396636.sra.694156",
+  "SRR396636.sra.1199498",
+  "SRR396636.sra.150889",
+  "SRR396636.sra.638136",
+  "SRR396636.sra.225782",
+  "SRR396636.sra.340982",
+  "SRR396636.sra.1273458",
+  "SRR396636.sra.425330",
+  "SRR396636.sra.1332496",
+  "SRR396636.sra.1261885",
+  "SRR396636.sra.1565190",
+  "SRR396636.sra.198015",
+  "SRR396636.sra.416809",
+  "SRR396636.sra.352126",
+  "SRR396636.sra.774429",
+  "SRR396636.sra.1068621",
+  "SRR396636.sra.870597",
+  "SRR396636.sra.1019791",
+  "SRR396636.sra.639740",
+  "SRR396636.sra.901953",
+  "SRR396636.sra.1727926",
+  "SRR396636.sra.1895720",
+  "SRR396636.sra.1391968",
+  "SRR396636.sra.43114",
+  "SRR396636.sra.611817",
+  "SRR396636.sra.1701133",
+  "SRR396636.sra.318771",
+  "SRR396636.sra.771836",
+  "SRR396636.sra.318771",
+  "SRR396636.sra.1868261",
+  "SRR396636.sra.25311",
+  "SRR396636.sra.1359085",
+  "SRR396636.sra.40136",
+  "SRR396636.sra.1167072",
+  "SRR396636.sra.1255146",
+  "SRR396636.sra.1753086",
+  "SRR396636.sra.511352",
+  "SRR396636.sra.1020911",
+  "SRR396636.sra.55625",
+  "SRR396636.sra.1464652",
+  "SRR396636.sra.337369",
+  "SRR396636.sra.924115",
+  "SRR396636.sra.1747493",
+  "SRR396636.sra.765561",
+  "SRR396636.sra.1003460",
+  "SRR396636.sra.1703469",
+  "SRR396636.sra.1840591",
+  "SRR396636.sra.1342406",
+  "SRR396636.sra.64097",
+  "SRR396636.sra.1352195",
+  "SRR396636.sra.1149722",
+  "SRR396636.sra.1178364",
+  "SRR396636.sra.540041",
+  "SRR396636.sra.614643",
+  "SRR396636.sra.1680729",
+  "SRR396636.sra.1227613",
+  "SRR396636.sra.796957",
+  "SRR396636.sra.886819",
+  "SRR396636.sra.1289100",
+  "SRR396636.sra.1717635",
+  "SRR396636.sra.831823",
+  "SRR396636.sra.464626",
+  "SRR396636.sra.175669",
+  "SRR396636.sra.19806",
+  "SRR396636.sra.1113762",
+  "SRR396636.sra.590781",
+  "SRR396636.sra.594937",
+  "SRR396636.sra.174159",
+  "SRR396636.sra.573443",
+  "SRR396636.sra.201265",
+  "SRR396636.sra.1813919",
+  "SRR396636.sra.1117231",
+  "SRR396636.sra.626822",
+  "SRR396636.sra.1398778",
+  "SRR396636.sra.1289065",
+  "SRR396636.sra.423932",
+  "SRR396636.sra.3440",
+  "SRR396636.sra.1461706",
+  "SRR396636.sra.474167",
+  "SRR396636.sra.1250239",
+  "SRR396636.sra.1648856",
+  "SRR396636.sra.399452",
+  "SRR396636.sra.255386",
+  "SRR396636.sra.661307",
+  "SRR396636.sra.1794301",
+  "SRR396636.sra.320097",
+  "SRR396636.sra.1384320",
+  "SRR396636.sra.620876",
+  "SRR396636.sra.849410",
+  "SRR396636.sra.1102641",
+  "SRR396636.sra.1842353",
+  "SRR396636.sra.1547108",
+  "SRR396636.sra.1616848",
+  "SRR396636.sra.507136",
+  "SRR396636.sra.1295193",
+  "SRR396636.sra.790086",
+  "SRR396636.sra.1718763",
+  "SRR396636.sra.494829",
+  "SRR396636.sra.1718763",
+  "SRR396636.sra.1333958",
+  "SRR396636.sra.323226",
+  "SRR396636.sra.1011832",
+  "SRR396636.sra.1368187",
+  "SRR396636.sra.873395",
+  "SRR396636.sra.1591209",
+  "SRR396636.sra.195475",
+  "SRR396636.sra.822865",
+  "SRR396636.sra.1301555",
+  "SRR396636.sra.469558",
+  "SRR396636.sra.1369540",
+  "SRR396636.sra.454912",
+  "SRR396636.sra.540349",
+  "SRR396636.sra.926546",
+  "SRR396636.sra.1173312",
+  "SRR396636.sra.1480434",
+  "SRR396636.sra.1876493",
+  "SRR396636.sra.1134126",
+  "SRR396636.sra.842644",
+  "SRR396636.sra.247052",
+  "SRR396636.sra.1571342",
+  "SRR396636.sra.411537",
+  "SRR396636.sra.1729372",
+  "SRR396636.sra.715685",
+  "SRR396636.sra.1321830",
+  "SRR396636.sra.423731",
+  "SRR396636.sra.409059",
+  "SRR396636.sra.371521",
+  "SRR396636.sra.1453204",
+  "SRR396636.sra.1545427",
+  "SRR396636.sra.471964",
+  "SRR396636.sra.1801681",
+  "SRR396636.sra.812801",
+  "SRR396636.sra.987490",
+  "SRR396636.sra.1350597",
+  "SRR396636.sra.1409813",
+  "SRR396636.sra.269061",
+  "SRR396636.sra.515010",
+  "SRR396636.sra.1222574",
+  "SRR396636.sra.1436940",
+  "SRR396636.sra.1820486",
+  "SRR396636.sra.1621691",
+  "SRR396636.sra.848332",
+  "SRR396636.sra.1524854",
+  "SRR396636.sra.1015863",
+  "SRR396636.sra.1301964",
+  "SRR396636.sra.3152",
+  "SRR396636.sra.401219",
+  "SRR396636.sra.242934",
+  "SRR396636.sra.1461706",
+  "SRR396636.sra.1103126",
+  "SRR396636.sra.286839",
+  "SRR396636.sra.1316985",
+  "SRR396636.sra.1487385",
+  "SRR396636.sra.33101",
+  "SRR396636.sra.968985",
+  "SRR396636.sra.1655480",
+  "SRR396636.sra.1339886",
+  "SRR396636.sra.1855650",
+  "SRR396636.sra.595190",
+  "SRR396636.sra.942190",
+  "SRR396636.sra.992823",
+  "SRR396636.sra.135838",
+  "SRR396636.sra.682653",
+  "SRR396636.sra.724553",
+  "SRR396636.sra.1303454",
+  "SRR396636.sra.614643",
+  "SRR396636.sra.505268",
+  "SRR396636.sra.537571",
+  "SRR396636.sra.430593",
+  "SRR396636.sra.1176032",
+  "SRR396636.sra.1232984",
+  "SRR396636.sra.1703469",
+  "SRR396636.sra.1052658",
+  "SRR396636.sra.1714827",
+  "SRR396636.sra.755536",
+  "SRR396636.sra.796224",
+  "SRR396636.sra.1776061",
+  "SRR396636.sra.519197",
+  "SRR396636.sra.658805",
+  "SRR396636.sra.630135",
+  "SRR396636.sra.754729",
+  "SRR396636.sra.837927",
+  "SRR396636.sra.611660",
+  "SRR396636.sra.754865",
+  "SRR396636.sra.1810143",
+  "SRR396636.sra.254916",
+  "SRR396636.sra.1301249",
+  "SRR396636.sra.1566421",
+  "SRR396636.sra.312040",
+  "SRR396636.sra.92138",
+  "SRR396636.sra.215542",
+  "SRR396636.sra.104783",
+  "SRR396636.sra.33736",
+  "SRR396636.sra.1054311",
+  "SRR396636.sra.635996",
+  "SRR396636.sra.1864622",
+  "SRR396636.sra.807703",
+  "SRR396636.sra.138292",
+  "SRR396636.sra.166407",
+  "SRR396636.sra.1869189",
+  "SRR396636.sra.1783043",
+  "SRR396636.sra.1902068",
+  "SRR396636.sra.793750",
+  "SRR396636.sra.1360568",
+  "SRR396636.sra.405289",
+  "SRR396636.sra.175802",
+  "SRR396636.sra.1399072",
+  "SRR396636.sra.1412675",
+  "SRR396636.sra.1531897",
+  "SRR396636.sra.856872",
+  "SRR396636.sra.318982",
+  "SRR396636.sra.799864",
+  "SRR396636.sra.403963",
+  "SRR396636.sra.1468441",
+  "SRR396636.sra.370702",
+  "SRR396636.sra.458134",
+  "SRR396636.sra.155792",
+  "SRR396636.sra.788873",
+  "SRR396636.sra.1828241",
+  "SRR396636.sra.500252",
+  "SRR396636.sra.361365",
+  "SRR396636.sra.1082435",
+  "SRR396636.sra.1206392",
+  "SRR396636.sra.1701133",
+  "SRR396636.sra.1180680",
+  "SRR396636.sra.50031",
+  "SRR396636.sra.317109",
+  "SRR396636.sra.633882",
+  "SRR396636.sra.1361910",
+  "SRR396636.sra.1716188",
+  "SRR396636.sra.1625216",
+  "SRR396636.sra.1227613",
+  "SRR396636.sra.1708208",
+  "SRR396636.sra.1281874",
+  "SRR396636.sra.1361460",
+  "SRR396636.sra.1571342",
+  "SRR396636.sra.871481",
+  "SRR396636.sra.372851",
+  "SRR396636.sra.1025308",
+  "SRR396636.sra.1509724",
+  "SRR396636.sra.464626",
+]
+`;
diff --git a/test/indexedfile.test.ts b/test/indexedfile.test.ts
index e9b6a7a1..a4db1453 100644
--- a/test/indexedfile.test.ts
+++ b/test/indexedfile.test.ts
@@ -219,9 +219,7 @@ describe('match samtools', () => {
     })
 
     const features = await cram.getRecordsForRange(0, 25999, 26499)
-
-    const featNames = await loadTestJSON('SRR396636.expected.names.json')
-    expect(features.map(f => f.readName)).toEqual(featNames)
+    expect(features.map(f => f.readName)).toMatchSnapshot()
     expect(features.length).toEqual(406)
   })
 })
diff --git a/test/lib/util.ts b/test/lib/util.ts
index d6955ba4..af2c9306 100644
--- a/test/lib/util.ts
+++ b/test/lib/util.ts
@@ -1,40 +1,13 @@
-//@ts-nocheck
-const path = typeof __webpack_require__ !== 'function' ? require('path') : null // eslint-disable-line camelcase
-const fs = typeof __webpack_require__ !== 'function' ? require('fs') : null // eslint-disable-line camelcase
 import { fromUrl } from '../../src/io'
+import path from 'path'
 
 const dataDir = path && path.dirname(require.resolve('../data/xx.fa'))
 
-function testDataUrl(filename) {
+export function testDataUrl(filename: string) {
   return `file://${dataDir}/${filename}`.replace('#', '%23')
 }
 
-function testDataFile(filename) {
+export function testDataFile(filename: string) {
   const source = testDataUrl(filename)
   return fromUrl(source)
 }
-
-async function loadTestJSON(filename) {
-  const data = await testDataFile(`${filename}`).readFile()
-  const text = data.toString()
-  return JSON.parse(text)
-}
-
-export function JsonClone(obj) {
-  return JSON.parse(JSON.stringify(obj))
-}
-
-const REWRITE_EXPECTED_DATA =
-  typeof process !== 'undefined' &&
-  process.env.CRAMJS_REWRITE_EXPECTED_DATA &&
-  process.env.CRAMJS_REWRITE_EXPECTED_DATA !== '0' &&
-  process.env.CRAMJS_REWRITE_EXPECTED_DATA !== 'false'
-
-module.exports = {
-  testDataUrl,
-  testDataFile,
-  loadTestJSON,
-  JsonClone,
-  REWRITE_EXPECTED_DATA,
-  fs,
-}