diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0153ee6..4d02fdd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Changelog
 
+## v0.0.34 Ease testing of PubSub
+- Add function `gcp.pubsubcmp.DiffMessages`.
+
 ## v0.0.5 - Migrate `dockerimage` to _sherlock-mavrodi_
 
 - Add function `dockerimage.BuildFromContainerfile` for building Container Image.
diff --git a/pkg/gcp/pubsubcmp/message.go b/pkg/gcp/pubsubcmp/message.go
new file mode 100644
index 0000000..416e146
--- /dev/null
+++ b/pkg/gcp/pubsubcmp/message.go
@@ -0,0 +1,42 @@
+package pubsubcmp
+
+import (
+	"time"
+
+	"cloud.google.com/go/pubsub"
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
+)
+
+// DiffMessages compares two Messages for equality using all exported Fields.
+// Ignores differences in:
+// - Attributes.ce-id
+// - ID
+// - PublishTime
+func DiffMessages(lhs pubsub.Message, rhs pubsub.Message) string {
+	lhs.ID = ""
+	rhs.ID = ""
+	lhsAttrs := make(map[string]string, len(lhs.Attributes))
+	for k, v := range lhs.Attributes {
+		if k == "ce-id" {
+			continue
+		}
+		lhsAttrs[k] = v
+	}
+	lhs.Attributes = lhsAttrs
+
+	rhsAttrs := make(map[string]string, len(rhs.Attributes))
+	for k, v := range rhs.Attributes {
+		if k == "ce-id" {
+			continue
+		}
+		rhsAttrs[k] = v
+	}
+	rhs.Attributes = rhsAttrs
+
+	pt := time.Now()
+	lhs.PublishTime = pt
+	rhs.PublishTime = pt
+
+	return cmp.Diff(lhs, rhs, cmpopts.IgnoreUnexported(pubsub.Message{}))
+}