diff --git a/testing/cppunittest.ini b/testing/cppunittest.ini
index 4047270bbefb..ef2e29345a94 100644
--- a/testing/cppunittest.ini
+++ b/testing/cppunittest.ini
@@ -33,7 +33,6 @@ skip-if = os != 'win'
 [TestFloatingPoint]
 [TestFunction]
 [TestGetURL]
-[TestID]
 [TestIntegerPrintfMacros]
 [TestIntegerRange]
 [TestIsCertBuiltInRoot]
diff --git a/xpcom/tests/TestID.cpp b/xpcom/tests/gtest/TestID.cpp
similarity index 65%
rename from xpcom/tests/TestID.cpp
rename to xpcom/tests/gtest/TestID.cpp
index 2585cf9103c4..cb56554dcd03 100644
--- a/xpcom/tests/TestID.cpp
+++ b/xpcom/tests/gtest/TestID.cpp
@@ -2,10 +2,11 @@
 /* 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/. */
-#include <stdio.h>
-#include "plstr.h"
+
 #include "nsID.h"
 
+#include "gtest/gtest.h"
+
 static const char* const ids[] = {
   "5C347B10-D55C-11D1-89B7-006008911B81",
   "{5C347B10-D55C-11D1-89B7-006008911B81}",
@@ -19,25 +20,17 @@ static const char* const ids[] = {
 };
 #define NUM_IDS ((int) (sizeof(ids) / sizeof(ids[0])))
 
-int main(int argc, char** argv)
+TEST(nsID, StringConversion)
 {
   nsID id;
   for (int i = 0; i < NUM_IDS; i++) {
     const char* idstr = ids[i];
-    if (!id.Parse(idstr)) {
-      fprintf(stderr, "TestID: Parse failed on test #%d\n", i);
-      return -1;
-    }
-    char* cp = id.ToString();
-    if (nullptr == cp) {
-      fprintf(stderr, "TestID: ToString failed on test #%d\n", i);
-      return -1;
-    }
-    if (0 != PL_strcmp(cp, ids[4*(i/4) + 3])) {
-      fprintf(stderr, "TestID: compare of ToString failed on test #%d\n", i);
-      return -1;
-    }
-  }
+    ASSERT_TRUE(id.Parse(idstr));
 
-  return 0;
+    char* cp = id.ToString();
+    ASSERT_NE(cp, nullptr);
+    ASSERT_STREQ(cp, ids[4*(i/4) + 3]);
+
+    free(cp);
+  }
 }
diff --git a/xpcom/tests/gtest/moz.build b/xpcom/tests/gtest/moz.build
index ff98d858ec19..4f992c66e195 100644
--- a/xpcom/tests/gtest/moz.build
+++ b/xpcom/tests/gtest/moz.build
@@ -17,6 +17,7 @@ UNIFIED_SOURCES += [
     'TestEscapeURL.cpp',
     'TestExpirationTracker.cpp',
     'TestFile.cpp',
+    'TestID.cpp',
     'TestNSPRLogModulesParser.cpp',
     'TestPipes.cpp',
     'TestPLDHash.cpp',
diff --git a/xpcom/tests/moz.build b/xpcom/tests/moz.build
index 5abb01bef31a..da308acbcaa7 100644
--- a/xpcom/tests/moz.build
+++ b/xpcom/tests/moz.build
@@ -46,7 +46,6 @@ if CONFIG['WRAP_STL_INCLUDES'] and not CONFIG['CLANG_CL']:
 XPCSHELL_TESTS_MANIFESTS += ['unit/xpcshell.ini']
 
 GeckoCppUnitTests([
-    'TestID',
     'TestNsRefPtr',
     'TestObserverArray',
     'TestObserverService',