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 25 using std::unique_ptr; 26 27 namespace chromeos_update_manager { 28 29 class 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 43 TEST_F(UmRealRandomProviderTest, InitFinalize) { 44 // The provider initializes all variables with valid objects. 45 EXPECT_NE(nullptr, provider_->var_seed()); 46 } 47 48 TEST_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
