[ios] Add cpe metrics util test

Bug: 1066804
Change-Id: I9b16c33790d0a68305e2b6041d41ddda064f4c35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209052
Commit-Queue: David Jean <djean@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770483}

ios/chrome/credential_provider_extension/BUILD.gn

@@ -100,10 +100,15 @@ generate_localizable_strings("system_strings") {
 
 source_set("unit_tests") {
   testonly = true
-  sources = [ "password_util_unittest.mm" ]
+  sources = [
+    "metrics_util_unittest.mm",
+    "password_util_unittest.mm",
+  ]
   deps = [
+    ":metrics_util",
     ":password_util",
     "//base",
+    "//ios/chrome/common/app_group",
     "//testing/gtest",
   ]
   configs += [ "//build/config/compiler:enable_arc" ]

ios/chrome/credential_provider_extension/metrics_util_unittest.mm

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+#include "ios/chrome/credential_provider_extension/metrics_util.h"
+
+#import <Foundation/Foundation.h>
+#import <Security/Security.h>
+
+#include "ios/chrome/common/app_group/app_group_constants.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/gtest_mac.h"
+#include "testing/platform_test.h"
+
+namespace credential_provider_extension {
+
+NSString* kMetric1 = @"CpeMetricTest1";
+NSString* kMetric2 = @"CpeMetricTest2";
+
+void RemoveMetricForKey(NSString* key) {
+  NSUserDefaults* sharedDefaults = app_group::GetGroupUserDefaults();
+  [sharedDefaults removeObjectForKey:key];
+}
+
+void VerifyMetricForKey(NSString* key, int valueExpected) {
+  NSUserDefaults* sharedDefaults = app_group::GetGroupUserDefaults();
+  NSInteger value = [sharedDefaults integerForKey:key];
+  ASSERT_EQ(value, valueExpected);
+}
+
+class MetricsUtilTest : public PlatformTest {
+ public:
+  void SetUp() override;
+  void TearDown() override;
+};
+
+void MetricsUtilTest::SetUp() {
+  RemoveMetricForKey(kMetric1);
+  RemoveMetricForKey(kMetric2);
+}
+
+void MetricsUtilTest::TearDown() {
+  RemoveMetricForKey(kMetric1);
+  RemoveMetricForKey(kMetric2);
+}
+
+// Tests increase and reset of metrics.
+TEST_F(MetricsUtilTest, CheckUMACountUpdatesAsExpected) {
+  VerifyMetricForKey(kMetric1, 0);
+  VerifyMetricForKey(kMetric2, 0);
+  UpdateUMACountForKey(kMetric1);
+  VerifyMetricForKey(kMetric1, 1);
+  VerifyMetricForKey(kMetric2, 0);
+  UpdateUMACountForKey(kMetric2);
+  UpdateUMACountForKey(kMetric2);
+  VerifyMetricForKey(kMetric1, 1);
+  VerifyMetricForKey(kMetric2, 2);
+  RemoveMetricForKey(kMetric2);
+  VerifyMetricForKey(kMetric1, 1);
+  VerifyMetricForKey(kMetric2, 0);
+}
+
+}  // credential_provider_extension

ios/chrome/credential_provider_extension/password_util_unittest.mm

-// Copyright 2018 The Chromium Authors. All rights reserved.
+// Copyright 2020 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.