Update basic test to allow being run in parallel on client

The basic test does an assert on the existing snapshots.
Update the check just to assert the expected snapshots were
found during the walk.

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

snapshot/testsuite/testsuite.go

@@ -190,7 +190,14 @@ func checkSnapshotterBasic(ctx context.Context, t *testing.T, snapshotter snapsh
 		return nil
 	}))
 
-	assert.Equal(t, expected, walked)
+	for ek, ev := range expected {
+		av, ok := walked[ek]
+		if !ok {
+			t.Errorf("Missing stat for %v", ek)
+			continue
+		}
+		assert.Equal(t, ev, av)
+	}
 
 	nextnext := filepath.Join(work, "nextnextlayer")
 	if err := os.MkdirAll(nextnext, 0777); err != nil {