Add tests for plugin helpers

- Prevents code analysis from showing functions as unused
- Also address other code analysis issues

integration_test/omni_full_transformer.go

@@ -2,9 +2,14 @@ package integration
 
 import (
 	"fmt"
+	"math/rand"
+	"strings"
+	"time"
+
 	"github.com/ethereum/go-ethereum/common"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
@@ -12,9 +17,6 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/omni/shared/constants"
 	"github.com/vulcanize/vulcanizedb/pkg/omni/shared/helpers/test_helpers"
 	"github.com/vulcanize/vulcanizedb/pkg/omni/shared/helpers/test_helpers/mocks"
-	"math/rand"
-	"strings"
-	"time"
 )
 
 var _ = Describe("Omni full transformer", func() {