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diff --git a/comm/mailnews/addrbook/test/unit/test_cardDAV_serverModified.js b/comm/mailnews/addrbook/test/unit/test_cardDAV_serverModified.js
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+++ b/comm/mailnews/addrbook/test/unit/test_cardDAV_serverModified.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Tests what happens if a server modifies a card when it first arrives.
+ * In this test the server changes the card's UID and path, which Google's
+ * CardDAV server does, and also adds a new property. All changes should be
+ * reflected in the client. */
+
+add_task(async () => {
+  CardDAVServer.modifyCardOnPut = true;
+
+  let directory = initDirectory();
+  await directory.fetchAllFromServer();
+
+  observer.init();
+
+  // Create a new card, and check it has the right UID.
+
+  let newCard = Cc["@mozilla.org/addressbook/cardproperty;1"].createInstance(
+    Ci.nsIAbCard
+  );
+  newCard.displayName = "A New Card";
+  newCard.UID = "a-new-card";
+  newCard = directory.addCard(newCard);
+  observer.checkAndClearNotifications({
+    "addrbook-contact-created": ["a-new-card"],
+    "addrbook-contact-updated": [],
+    "addrbook-contact-deleted": [],
+  });
+
+  Assert.equal(directory.childCards.length, 1);
+  Assert.equal(directory.childCards[0].UID, "a-new-card");
+
+  // Wait for notifications. Both arrive at once so we listen for the first.
+
+  let newUID = await observer.waitFor("addrbook-contact-created");
+  Assert.equal(newUID, "drac-wen-a");
+
+  // Check the original card was deleted.
+
+  observer.checkAndClearNotifications({
+    "addrbook-contact-created": [],
+    "addrbook-contact-updated": [],
+    "addrbook-contact-deleted": ["a-new-card"],
+  });
+
+  // Check we have the card as modified by the server.
+
+  Assert.equal(directory.childCards.length, 1);
+  let modifiedCard = directory.childCards[0];
+  Assert.equal(modifiedCard.UID, "drac-wen-a");
+  Assert.equal(modifiedCard.getProperty("_etag", ""), "92");
+  Assert.equal(
+    modifiedCard.getProperty("_href", ""),
+    "/addressbooks/me/test/drac-wen-a.vcf"
+  );
+  Assert.stringContains(
+    modifiedCard.getProperty("_vCard", ""),
+    "UID:drac-wen-a\r\n"
+  );
+  Assert.stringContains(
+    modifiedCard.getProperty("_vCard", ""),
+    "X-MODIFIED-BY-SERVER:1\r\n"
+  );
+
+  await clearDirectory(directory);
+});