Extract shared mock converter and repository

pkg/transformers/test_data/mocks/converter.go

@@ -0,0 +1,24 @@
+package mocks
+
+import (
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+type MockConverter struct {
+	err          error
+	returnModels []interface{}
+	PassedLogs   []types.Log
+}
+
+func (converter *MockConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
+	converter.PassedLogs = ethLogs
+	return converter.returnModels, converter.err
+}
+
+func (converter *MockConverter) SetConverterError(e error) {
+	converter.err = e
+}
+
+func (converter *MockConverter) SetReturnModels(models []interface{}) {
+	converter.returnModels = models
+}