more refactor

Author: FGasper

internal/util/buildinfo.go

@@ -30,6 +30,9 @@ func GetBuildInfo(ctx context.Context, client *mongo.Client) (BuildInfo, error)
 
 	var msg string
 	_, err = mbson.RawLookup(rawResp, &msg, "msg")
+	if err != nil {
+		return BuildInfo{}, errors.Wrap(err, "failed to determine topology from build info")
+	}
 	bi.IsSharded = msg == "isdbgrid"
 
 	return bi, nil

internal/verifier/integration_test_suite.go

@@ -24,8 +24,6 @@ const (
 	TopologySharded TestTopology = "sharded"
 )
 
-var knownTopologies = []TestTopology{TopologyReplset, TopologySharded}
-
 type IntegrationTestSuite struct {
 	suite.Suite
 	srcConnStr, dstConnStr, metaConnStr             string