1//
2// Copyright (C) 2014 The Android Open Source Project
3//
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at
7//
8//      http://www.apache.org/licenses/LICENSE-2.0
9//
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15//
16
17#include "update_engine/update_manager/real_random_provider.h"
18
19#include <gtest/gtest.h>
20
21#include <memory>
22
23#include "update_engine/update_manager/umtest_utils.h"
24
25using std::unique_ptr;
26
27namespace chromeos_update_manager {
28
29class UmRealRandomProviderTest : public ::testing::Test {
30 protected:
31  void SetUp() override {
32    // The provider initializes correctly.
33    provider_.reset(new RealRandomProvider());
34    ASSERT_NE(nullptr, provider_.get());
35    ASSERT_TRUE(provider_->Init());
36
37    provider_->var_seed();
38  }
39
40  unique_ptr<RealRandomProvider> provider_;
41};
42
43TEST_F(UmRealRandomProviderTest, InitFinalize) {
44  // The provider initializes all variables with valid objects.
45  EXPECT_NE(nullptr, provider_->var_seed());
46}
47
48TEST_F(UmRealRandomProviderTest, GetRandomValues) {
49  // Should not return the same random seed repeatedly.
50  unique_ptr<const uint64_t> value(
51      provider_->var_seed()->GetValue(UmTestUtils::DefaultTimeout(), nullptr));
52  ASSERT_NE(nullptr, value.get());
53
54  // Test that at least the returned values are different. This test fails,
55  // by design, once every 2^320 runs.
56  bool is_same_value = true;
57  for (int i = 0; i < 5; i++) {
58    unique_ptr<const uint64_t> other_value(
59        provider_->var_seed()->GetValue(UmTestUtils::DefaultTimeout(),
60                                        nullptr));
61    ASSERT_NE(nullptr, other_value.get());
62    is_same_value = is_same_value && *other_value == *value;
63  }
64  EXPECT_FALSE(is_same_value);
65}
66
67}  // namespace chromeos_update_manager
68