Update test for real-world data

This test assumed that at least one 'snapshot' wrapper checksum was unique,
and not contained in the set of wrapper checksums for released distributions.
This is no longer the case, so the assumption has been modified.

sources/test/jest/wrapper-validation/checksums.test.ts

@@ -37,7 +37,8 @@ test('fetches wrapper jar checksums for snapshots', async () => {
   const validChecksums = await checksums.fetchUnknownChecksums(true, new checksums.WrapperChecksums)
 
   // Expect that at least one snapshot checksum is different from the non-snapshot checksums
-  expect(validChecksums.size).toBeGreaterThan(nonSnapshotChecksums.size)
+  expect(nonSnapshotChecksums.size).toBeGreaterThan(10)
+  expect(validChecksums.size).toBeGreaterThanOrEqual(nonSnapshotChecksums.size)
 })
 
 test('fetches all wrapper checksum URLS for snapshots', async () => {