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abseil-cpp/absl/random/mocking_bit_gen_test.cc

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//
// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "absl/random/mocking_bit_gen.h"
#include <cmath>
#include <numeric>
#include <random>
#include "gmock/gmock.h"
#include "gtest/gtest-spi.h"
#include "gtest/gtest.h"
#include "absl/random/bit_gen_ref.h"
#include "absl/random/mock_distributions.h"
#include "absl/random/random.h"
namespace {
using ::testing::_;
using ::testing::Ne;
using ::testing::Return;
TEST(BasicMocking, AllDistributionsAreOverridable) {
absl::MockingBitGen gen;
EXPECT_NE(absl::Uniform<int>(gen, 1, 1000000), 20);
EXPECT_CALL(absl::MockUniform<int>(), Call(gen, 1, 1000000))
.WillOnce(Return(20));
EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000000), 20);
EXPECT_NE(absl::Uniform<double>(gen, 0.0, 100.0), 5.0);
EXPECT_CALL(absl::MockUniform<double>(), Call(gen, 0.0, 100.0))
.WillOnce(Return(5.0));
EXPECT_EQ(absl::Uniform<double>(gen, 0.0, 100.0), 5.0);
EXPECT_NE(absl::Exponential<double>(gen, 1.0), 42);
EXPECT_CALL(absl::MockExponential<double>(), Call(gen, 1.0))
.WillOnce(Return(42));
EXPECT_EQ(absl::Exponential<double>(gen, 1.0), 42);
EXPECT_NE(absl::Poisson<int>(gen, 1.0), 500);
EXPECT_CALL(absl::MockPoisson<int>(), Call(gen, 1.0)).WillOnce(Return(500));
EXPECT_EQ(absl::Poisson<int>(gen, 1.0), 500);
EXPECT_NE(absl::Bernoulli(gen, 0.000001), true);
EXPECT_CALL(absl::MockBernoulli(), Call(gen, 0.000001))
.WillOnce(Return(true));
EXPECT_EQ(absl::Bernoulli(gen, 0.000001), true);
EXPECT_NE(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
EXPECT_CALL(absl::MockZipf<int>(), Call(gen, 1000000, 2.0, 1.0))
.WillOnce(Return(1221));
EXPECT_EQ(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
EXPECT_NE(absl::Gaussian<double>(gen, 0.0, 1.0), 0.001);
EXPECT_CALL(absl::MockGaussian<double>(), Call(gen, 0.0, 1.0))
.WillOnce(Return(0.001));
EXPECT_EQ(absl::Gaussian<double>(gen, 0.0, 1.0), 0.001);
EXPECT_NE(absl::LogUniform<int>(gen, 0, 1000000, 2), 500000);
EXPECT_CALL(absl::MockLogUniform<int>(), Call(gen, 0, 1000000, 2))
.WillOnce(Return(500000));
EXPECT_EQ(absl::LogUniform<int>(gen, 0, 1000000, 2), 500000);
}
TEST(BasicMocking, OnDistribution) {
absl::MockingBitGen gen;
EXPECT_NE(absl::Uniform<int>(gen, 1, 1000000), 20);
ON_CALL(absl::MockUniform<int>(), Call(gen, 1, 1000000))
.WillByDefault(Return(20));
EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000000), 20);
EXPECT_NE(absl::Uniform<double>(gen, 0.0, 100.0), 5.0);
ON_CALL(absl::MockUniform<double>(), Call(gen, 0.0, 100.0))
.WillByDefault(Return(5.0));
EXPECT_EQ(absl::Uniform<double>(gen, 0.0, 100.0), 5.0);
EXPECT_NE(absl::Exponential<double>(gen, 1.0), 42);
ON_CALL(absl::MockExponential<double>(), Call(gen, 1.0))
.WillByDefault(Return(42));
EXPECT_EQ(absl::Exponential<double>(gen, 1.0), 42);
EXPECT_NE(absl::Poisson<int>(gen, 1.0), 500);
ON_CALL(absl::MockPoisson<int>(), Call(gen, 1.0)).WillByDefault(Return(500));
EXPECT_EQ(absl::Poisson<int>(gen, 1.0), 500);
EXPECT_NE(absl::Bernoulli(gen, 0.000001), true);
ON_CALL(absl::MockBernoulli(), Call(gen, 0.000001))
.WillByDefault(Return(true));
EXPECT_EQ(absl::Bernoulli(gen, 0.000001), true);
EXPECT_NE(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
ON_CALL(absl::MockZipf<int>(), Call(gen, 1000000, 2.0, 1.0))
.WillByDefault(Return(1221));
EXPECT_EQ(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
EXPECT_NE(absl::Gaussian<double>(gen, 0.0, 1.0), 0.001);
ON_CALL(absl::MockGaussian<double>(), Call(gen, 0.0, 1.0))
.WillByDefault(Return(0.001));
EXPECT_EQ(absl::Gaussian<double>(gen, 0.0, 1.0), 0.001);
EXPECT_NE(absl::LogUniform<int>(gen, 0, 1000000, 2), 2040);
ON_CALL(absl::MockLogUniform<int>(), Call(gen, 0, 1000000, 2))
.WillByDefault(Return(2040));
EXPECT_EQ(absl::LogUniform<int>(gen, 0, 1000000, 2), 2040);
}
TEST(BasicMocking, GMockMatchers) {
absl::MockingBitGen gen;
EXPECT_NE(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
ON_CALL(absl::MockZipf<int>(), Call(gen, 1000000, 2.0, 1.0))
.WillByDefault(Return(1221));
EXPECT_EQ(absl::Zipf<int>(gen, 1000000, 2.0, 1.0), 1221);
}
TEST(BasicMocking, OverridesWithMultipleGMockExpectations) {
absl::MockingBitGen gen;
EXPECT_CALL(absl::MockUniform<int>(), Call(gen, 1, 10000))
.WillOnce(Return(20))
.WillOnce(Return(40))
.WillOnce(Return(60));
EXPECT_EQ(absl::Uniform(gen, 1, 10000), 20);
EXPECT_EQ(absl::Uniform(gen, 1, 10000), 40);
EXPECT_EQ(absl::Uniform(gen, 1, 10000), 60);
}
TEST(BasicMocking, DefaultArgument) {
absl::MockingBitGen gen;
ON_CALL(absl::MockExponential<double>(), Call(gen, 1.0))
.WillByDefault(Return(200));
EXPECT_EQ(absl::Exponential<double>(gen), 200);
EXPECT_EQ(absl::Exponential<double>(gen, 1.0), 200);
}
TEST(BasicMocking, MultipleGenerators) {
auto get_value = [](absl::BitGenRef gen_ref) {
return absl::Uniform(gen_ref, 1, 1000000);
};
absl::MockingBitGen unmocked_generator;
absl::MockingBitGen mocked_with_3;
absl::MockingBitGen mocked_with_11;
EXPECT_CALL(absl::MockUniform<int>(), Call(mocked_with_3, 1, 1000000))
.WillOnce(Return(3))
.WillRepeatedly(Return(17));
EXPECT_CALL(absl::MockUniform<int>(), Call(mocked_with_11, 1, 1000000))
.WillOnce(Return(11))
.WillRepeatedly(Return(17));
// Ensure that unmocked generator generates neither value.
int unmocked_value = get_value(unmocked_generator);
EXPECT_NE(unmocked_value, 3);
EXPECT_NE(unmocked_value, 11);
// Mocked generators should generate their mocked values.
EXPECT_EQ(get_value(mocked_with_3), 3);
EXPECT_EQ(get_value(mocked_with_11), 11);
// Ensure that the mocks have expired.
EXPECT_NE(get_value(mocked_with_3), 3);
EXPECT_NE(get_value(mocked_with_11), 11);
}
TEST(BasicMocking, MocksNotTrigeredForIncorrectTypes) {
absl::MockingBitGen gen;
EXPECT_CALL(absl::MockUniform<uint32_t>(), Call(gen)).WillOnce(Return(42));
EXPECT_NE(absl::Uniform<uint16_t>(gen), 42); // Not mocked
EXPECT_EQ(absl::Uniform<uint32_t>(gen), 42); // Mock triggered
}
TEST(BasicMocking, FailsOnUnsatisfiedMocks) {
EXPECT_NONFATAL_FAILURE(
[]() {
absl::MockingBitGen gen;
EXPECT_CALL(absl::MockExponential<double>(), Call(gen, 1.0))
.WillOnce(Return(3.0));
// Does not call absl::Exponential().
}(),
"unsatisfied and active");
}
TEST(OnUniform, RespectsUniformIntervalSemantics) {
absl::MockingBitGen gen;
EXPECT_CALL(absl::MockUniform<int>(),
Call(absl::IntervalClosed, gen, 1, 1000000))
.WillOnce(Return(301));
EXPECT_NE(absl::Uniform(gen, 1, 1000000), 301); // Not mocked
EXPECT_EQ(absl::Uniform(absl::IntervalClosed, gen, 1, 1000000), 301);
}
TEST(OnUniform, RespectsNoArgUnsignedShorthand) {
absl::MockingBitGen gen;
EXPECT_CALL(absl::MockUniform<uint32_t>(), Call(gen)).WillOnce(Return(42));
EXPECT_EQ(absl::Uniform<uint32_t>(gen), 42);
}
TEST(RepeatedlyModifier, ForceSnakeEyesForManyDice) {
auto roll_some_dice = [](absl::BitGenRef gen_ref) {
std::vector<int> results(16);
for (auto& r : results) {
r = absl::Uniform(absl::IntervalClosed, gen_ref, 1, 6);
}
return results;
};
std::vector<int> results;
absl::MockingBitGen gen;
// Without any mocked calls, not all dice roll a "6".
results = roll_some_dice(gen);
EXPECT_LT(std::accumulate(std::begin(results), std::end(results), 0),
results.size() * 6);
// Verify that we can force all "6"-rolls, with mocking.
ON_CALL(absl::MockUniform<int>(), Call(absl::IntervalClosed, gen, 1, 6))
.WillByDefault(Return(6));
results = roll_some_dice(gen);
EXPECT_EQ(std::accumulate(std::begin(results), std::end(results), 0),
results.size() * 6);
}
TEST(WillOnce, DistinctCounters) {
absl::MockingBitGen gen;
EXPECT_CALL(absl::MockUniform<int>(), Call(gen, 1, 1000000))
.Times(3)
.WillRepeatedly(Return(0));
EXPECT_CALL(absl::MockUniform<int>(), Call(gen, 1000001, 2000000))
.Times(3)
.WillRepeatedly(Return(1));
EXPECT_EQ(absl::Uniform(gen, 1000001, 2000000), 1);
EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 0);
EXPECT_EQ(absl::Uniform(gen, 1000001, 2000000), 1);
EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 0);
EXPECT_EQ(absl::Uniform(gen, 1000001, 2000000), 1);
EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 0);
}
TEST(TimesModifier, ModifierSaturatesAndExpires) {
EXPECT_NONFATAL_FAILURE(
[]() {
absl::MockingBitGen gen;
EXPECT_CALL(absl::MockUniform<int>(), Call(gen, 1, 1000000))
.Times(3)
.WillRepeatedly(Return(15))
.RetiresOnSaturation();
EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 15);
EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 15);
EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 15);
// Times(3) has expired - Should get a different value now.
EXPECT_NE(absl::Uniform(gen, 1, 1000000), 15);
}(),
"");
}
TEST(TimesModifier, Times0) {
absl::MockingBitGen gen;
EXPECT_CALL(absl::MockBernoulli(), Call(gen, 0.0)).Times(0);
EXPECT_CALL(absl::MockPoisson<int>(), Call(gen, 1.0)).Times(0);
}
TEST(AnythingMatcher, MatchesAnyArgument) {
using testing::_;
{
absl::MockingBitGen gen;
ON_CALL(absl::MockUniform<int>(), Call(absl::IntervalClosed, gen, _, 1000))
.WillByDefault(Return(11));
ON_CALL(absl::MockUniform<int>(),
Call(absl::IntervalClosed, gen, _, Ne(1000)))
.WillByDefault(Return(99));
EXPECT_EQ(absl::Uniform(absl::IntervalClosed, gen, 10, 1000000), 99);
EXPECT_EQ(absl::Uniform(absl::IntervalClosed, gen, 10, 1000), 11);
}
{
absl::MockingBitGen gen;
ON_CALL(absl::MockUniform<int>(), Call(gen, 1, _))
.WillByDefault(Return(25));
ON_CALL(absl::MockUniform<int>(), Call(gen, Ne(1), _))
.WillByDefault(Return(99));
EXPECT_EQ(absl::Uniform(gen, 3, 1000000), 99);
EXPECT_EQ(absl::Uniform(gen, 1, 1000000), 25);
}
{
absl::MockingBitGen gen;
ON_CALL(absl::MockUniform<int>(), Call(gen, _, _))
.WillByDefault(Return(145));
EXPECT_EQ(absl::Uniform(gen, 1, 1000), 145);
EXPECT_EQ(absl::Uniform(gen, 10, 1000), 145);
EXPECT_EQ(absl::Uniform(gen, 100, 1000), 145);
}
}
TEST(AnythingMatcher, WithWillByDefault) {
using testing::_;
absl::MockingBitGen gen;
std::vector<int> values = {11, 22, 33, 44, 55, 66, 77, 88, 99, 1010};
ON_CALL(absl::MockUniform<size_t>(), Call(gen, 0, _))
.WillByDefault(Return(0));
for (int i = 0; i < 100; i++) {
auto& elem = values[absl::Uniform(gen, 0u, values.size())];
EXPECT_EQ(elem, 11);
}
}
TEST(BasicMocking, WillByDefaultWithArgs) {
using testing::_;
absl::MockingBitGen gen;
ON_CALL(absl::MockPoisson<int>(), Call(gen, _))
.WillByDefault([](double lambda) {
return static_cast<int>(std::rint(lambda * 10));
});
EXPECT_EQ(absl::Poisson<int>(gen, 1.7), 17);
EXPECT_EQ(absl::Poisson<int>(gen, 0.03), 0);
}
TEST(MockingBitGen, InSequenceSucceedsInOrder) {
absl::MockingBitGen gen;
testing::InSequence seq;
EXPECT_CALL(absl::MockPoisson<int>(), Call(gen, 1.0)).WillOnce(Return(3));
EXPECT_CALL(absl::MockPoisson<int>(), Call(gen, 2.0)).WillOnce(Return(4));
EXPECT_EQ(absl::Poisson<int>(gen, 1.0), 3);
EXPECT_EQ(absl::Poisson<int>(gen, 2.0), 4);
}
TEST(MockingBitGen, NiceMock) {
::testing::NiceMock<absl::MockingBitGen> gen;
ON_CALL(absl::MockUniform<int>(), Call(gen, _, _)).WillByDefault(Return(145));
ON_CALL(absl::MockPoisson<int>(), Call(gen, _)).WillByDefault(Return(3));
EXPECT_EQ(absl::Uniform(gen, 1, 1000), 145);
EXPECT_EQ(absl::Uniform(gen, 10, 1000), 145);
EXPECT_EQ(absl::Uniform(gen, 100, 1000), 145);
}
TEST(MockingBitGen, NaggyMock) {
// This is difficult to test, as only the output matters, so just verify
// that ON_CALL can be installed. Anything else requires log inspection.
::testing::NaggyMock<absl::MockingBitGen> gen;
ON_CALL(absl::MockUniform<int>(), Call(gen, _, _)).WillByDefault(Return(145));
ON_CALL(absl::MockPoisson<int>(), Call(gen, _)).WillByDefault(Return(3));
EXPECT_EQ(absl::Uniform(gen, 1, 1000), 145);
}
TEST(MockingBitGen, StrictMock_NotEnough) {
EXPECT_NONFATAL_FAILURE(
[]() {
::testing::StrictMock<absl::MockingBitGen> gen;
EXPECT_CALL(absl::MockUniform<int>(), Call(gen, _, _))
.WillOnce(Return(145));
}(),
"unsatisfied and active");
}
TEST(MockingBitGen, StrictMock_TooMany) {
::testing::StrictMock<absl::MockingBitGen> gen;
EXPECT_CALL(absl::MockUniform<int>(), Call(gen, _, _)).WillOnce(Return(145));
EXPECT_EQ(absl::Uniform(gen, 1, 1000), 145);
EXPECT_NONFATAL_FAILURE(
[&]() { EXPECT_EQ(absl::Uniform(gen, 10, 1000), 0); }(),
"over-saturated and active");
}
} // namespace