//
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// Copyright (C) 2014 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "update_engine/update_manager/real_random_provider.h"
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#include <gtest/gtest.h>
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#include <memory>
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#include "update_engine/update_manager/umtest_utils.h"
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using std::unique_ptr;
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namespace chromeos_update_manager {
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class UmRealRandomProviderTest : public ::testing::Test {
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protected:
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void SetUp() override {
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// The provider initializes correctly.
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provider_.reset(new RealRandomProvider());
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ASSERT_NE(nullptr, provider_.get());
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ASSERT_TRUE(provider_->Init());
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provider_->var_seed();
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}
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unique_ptr<RealRandomProvider> provider_;
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};
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TEST_F(UmRealRandomProviderTest, InitFinalize) {
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// The provider initializes all variables with valid objects.
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EXPECT_NE(nullptr, provider_->var_seed());
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}
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TEST_F(UmRealRandomProviderTest, GetRandomValues) {
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// Should not return the same random seed repeatedly.
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unique_ptr<const uint64_t> value(
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provider_->var_seed()->GetValue(UmTestUtils::DefaultTimeout(), nullptr));
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ASSERT_NE(nullptr, value.get());
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// Test that at least the returned values are different. This test fails,
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// by design, once every 2^320 runs.
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bool is_same_value = true;
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for (int i = 0; i < 5; i++) {
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unique_ptr<const uint64_t> other_value(provider_->var_seed()->GetValue(
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UmTestUtils::DefaultTimeout(), nullptr));
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ASSERT_NE(nullptr, other_value.get());
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is_same_value = is_same_value && *other_value == *value;
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}
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EXPECT_FALSE(is_same_value);
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}
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} // namespace chromeos_update_manager
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