Google單元測試框架gtest之官方sample筆記3--值引數化測試
阿新 • • 發佈：2021-03-03
1.7 sample7--介面測試
值引數不限定型別，也可以是類的引用，這就可以實現對類介面的測試，一個基類可以有多個繼承類，那麼可以測試不同的子類功能，但是隻需要寫一個測試用例，然後使用引數列表實現對每個子類的測試。
使用值引數測試法去測試多個實現了相同介面（類）的共同屬性（又叫做介面測試）
using ::testing::TestWithParam;
using ::testing::Values;
typedef PrimeTable* CreatePrimeTableFunc();
PrimeTable* CreateOnTheFlyPrimeTable() {
return new OnTheFlyPrimeTable();
}
template <size_t max_precalculated>
PrimeTable* CreatePreCalculatedPrimeTable() {
return new PreCalculatedPrimeTable(max_precalculated);
}
// Inside the test body, fixture constructor, SetUp(), and TearDown() you
// can refer to the test parameter by GetParam(). In this case, the test
// parameter is a factory function which we call in fixture's SetUp() to
// create and store an instance of PrimeTable.
class PrimeTableTestSmpl7 : public TestWithParam<CreatePrimeTableFunc*> {
public:
~PrimeTableTestSmpl7() override { delete table_; }
void SetUp() override { table_ = (*GetParam())(); }
void TearDown() override {
delete table_;
table_ = nullptr;
}
protected:
PrimeTable* table_;
};
TEST_P(PrimeTableTestSmpl7, ReturnsFalseForNonPrimes) {
EXPECT_FALSE(table_->IsPrime(-5));
EXPECT_FALSE(table_->IsPrime(0));
EXPECT_FALSE(table_->IsPrime(1));
EXPECT_FALSE(table_->IsPrime(4));
EXPECT_FALSE(table_->IsPrime(6));
EXPECT_FALSE(table_->IsPrime(100));
}
TEST_P(PrimeTableTestSmpl7, ReturnsTrueForPrimes) {
EXPECT_TRUE(table_->IsPrime(2));
EXPECT_TRUE(table_->IsPrime(3));
EXPECT_TRUE(table_->IsPrime(5));
EXPECT_TRUE(table_->IsPrime(7));
EXPECT_TRUE(table_->IsPrime(11));
EXPECT_TRUE(table_->IsPrime(131));
}
TEST_P(PrimeTableTestSmpl7, CanGetNextPrime) {
EXPECT_EQ(2, table_->GetNextPrime(1));
EXPECT_EQ(3, table_->GetNextPrime(2));
EXPECT_EQ(5, table_->GetNextPrime(3));
EXPECT_EQ(7, table_->GetNextPrime(5));
EXPECT_EQ(11, table_->GetNextPrime(7));
EXPECT_EQ(131, table_->GetNextPrime(128));
}
// In order to run value-parameterized tests, you need to instantiate them,
// or bind them to a list of values which will be used as test parameters.
// You can instantiate them in a different translation module, or even
// instantiate them several times.
//
// Here, we instantiate our tests with a list of two PrimeTable object
// factory functions:
#define INSTANTIATE_TEST_SUITE_P INSTANTIATE_TEST_CASE_P
INSTANTIATE_TEST_SUITE_P(OnTheFlyAndPreCalculated, PrimeTableTestSmpl7,
Values(&CreateOnTheFlyPrimeTable,
&CreatePreCalculatedPrimeTable<1000>));
1.8sample8--值引數測試
有些時候，我們需要對程式碼實現的功能使用不同的引數進行測試，比如使用大量隨機值來檢驗演算法實現的正確性，或者比較同一個介面的不同實現之間的差別。gtest把“集中輸入測試引數”的需求抽象出來提供支援，稱為值引數化測試（Value Parameterized Test）。
| 引數值序列生成函式 | 含義 |
|---|---|
Bool() |
生成序列 {false, true} |
Range(begin, end[, step]) |
生成序列 {begin, begin+step, begin+2*step, ...} (不含 end)， step預設為1 |
Values(v1, v2,vN) |
生成序列 {v1, v2, ..., vN} |
ValuesIn(container), ValuesIn(iter1, iter2) |
列舉STL container，或列舉迭代器範圍 [iter1, iter2) |
Combine(g1, g2, ..., gN) |
生成 g1, g2, ..., gN的笛卡爾積，其中g1, g2, ..., gN均為引數值序列生成函式（要求C++0x的<tr1/tuple>） |
程式碼實現
class HybridPrimeTable : public PrimeTable {
public:
HybridPrimeTable(bool force_on_the_fly, int max_precalculated)
: on_the_fly_impl_(new OnTheFlyPrimeTable),
precalc_impl_(force_on_the_fly
? nullptr
: new PreCalculatedPrimeTable(max_precalculated)),
max_precalculated_(max_precalculated) {}
~HybridPrimeTable() override {
delete on_the_fly_impl_;
delete precalc_impl_;
}
bool IsPrime(int n) const override {
if (precalc_impl_ != nullptr && n < max_precalculated_)
return precalc_impl_->IsPrime(n);
else
return on_the_fly_impl_->IsPrime(n);
}
int GetNextPrime(int p) const override {
int next_prime = -1;
if (precalc_impl_ != nullptr && p < max_precalculated_)
next_prime = precalc_impl_->GetNextPrime(p);
return next_prime != -1 ? next_prime : on_the_fly_impl_->GetNextPrime(p);
}
private:
OnTheFlyPrimeTable* on_the_fly_impl_;
PreCalculatedPrimeTable* precalc_impl_;
int max_precalculated_;
};
using ::testing::TestWithParam;
using ::testing::Bool;
using ::testing::Values;
using ::testing::Combine;
// To test all code paths for HybridPrimeTable we must test it with numbers
// both within and outside PreCalculatedPrimeTable's capacity and also with
// PreCalculatedPrimeTable disabled. We do this by defining fixture which will
// accept different combinations of parameters for instantiating a
// HybridPrimeTable instance.
class PrimeTableTest : public TestWithParam< ::std::tuple<bool, int> > {
protected:
void SetUp() override {
bool force_on_the_fly;
int max_precalculated;
std::tie(force_on_the_fly, max_precalculated) = GetParam();
table_ = new HybridPrimeTable(force_on_the_fly, max_precalculated);
}
void TearDown() override {
delete table_;
table_ = nullptr;
}
HybridPrimeTable* table_;
};PrimeTableTest類繼承於TestWithParam，是測試韌體類。接收引數tuple<bool,int>，如果bool為true時，使用OnTheFlyPrimeTable類的介面，當bool變數為false時，使用PreCalculatedPrimeTable介面測試。
測試編寫：
TEST_P(PrimeTableTest, ReturnsFalseForNonPrimes) {
EXPECT_FALSE(table_->IsPrime(-5));
EXPECT_FALSE(table_->IsPrime(0));
EXPECT_FALSE(table_->IsPrime(1));
EXPECT_FALSE(table_->IsPrime(4));
EXPECT_FALSE(table_->IsPrime(6));
EXPECT_FALSE(table_->IsPrime(100));
}
TEST_P(PrimeTableTest, ReturnsTrueForPrimes) {
EXPECT_TRUE(table_->IsPrime(2));
EXPECT_TRUE(table_->IsPrime(3));
EXPECT_TRUE(table_->IsPrime(5));
EXPECT_TRUE(table_->IsPrime(7));
EXPECT_TRUE(table_->IsPrime(11));
EXPECT_TRUE(table_->IsPrime(131));
}
TEST_P(PrimeTableTest, CanGetNextPrime) {
EXPECT_EQ(2, table_->GetNextPrime(0));
EXPECT_EQ(3, table_->GetNextPrime(2));
EXPECT_EQ(5, table_->GetNextPrime(3));
EXPECT_EQ(7, table_->GetNextPrime(5));
EXPECT_EQ(11, table_->GetNextPrime(7));
EXPECT_EQ(131, table_->GetNextPrime(128));
}
#define INSTANTIATE_TEST_SUITE_P INSTANTIATE_TEST_CASE_P
INSTANTIATE_TEST_SUITE_P(MeaningfulTestParameters, PrimeTableTest,
Combine(Bool(), Values(1, 10)));
共計3個測試case，測試名為MeaningfulTestParameters，輸入的引數是一個comine類，生成正交引數集合：
Combine(Bool(), Values(1, 10))); // Combine() allows the user to combine two or more sequences to produce // values of a Cartesian product of those sequences' elements. /* |--Bool--|--------- Value---------| | | 1 | 10 | | true | (true,1) | (true,10) | | false | (false,1) | (false,10) | */
本例有3個測試，引數正交後是4組引數，每組引數執行一次測試，所以輸出12個測試結果。執行截圖如下。
尊重技術文章，轉載請註明！
Google單元測試框架gtest之官方sample筆記3--值引數化測試
https://www.cnblogs.com/pingwen/p/14476324.html