add copyObject test changing metadata and preserving etag

functional_tests.go

@@ -2705,6 +2705,37 @@ func testCopyObject() {
 		return
 	}
 
+	// Perform the Copy which should update only metadata.
+	src = minio.NewSourceInfo(bucketName, objectName, nil)
+	dst, err = minio.NewDestinationInfo(bucketName, objectName, nil, map[string]string{
+		"Copy": "should be same",
+	})
+	args["dst"] = dst
+	args["src"] = src
+	if err != nil {
+		logError(testName, function, args, startTime, "", "NewDestinationInfo failed", err)
+		return
+	}
+
+	err = c.CopyObject(dst, src)
+	if err != nil {
+		logError(testName, function, args, startTime, "", "CopyObject shouldn't fail", err)
+		return
+	}
+
+	stOpts := minio.StatObjectOptions{}
+	stOpts.SetMatchETag(objInfo.ETag)
+	objInfo, err = c.StatObject(bucketName, objectName, stOpts)
+	if err != nil {
+		logError(testName, function, args, startTime, "", "CopyObject ETag should match and not fail", err)
+		return
+	}
+
+	if objInfo.Metadata.Get("x-amz-meta-copy") != "should be same" {
+		logError(testName, function, args, startTime, "", "CopyObject modified metadata should match", err)
+		return
+	}
+
 	// Delete all objects and buckets
 	if err = cleanupBucket(bucketName, c); err != nil {
 		logError(testName, function, args, startTime, "", "Cleanup failed", err)