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## C++ tests on iOS
[GTMGoogleTestRunner](https://github.com/google/google-toolbox-for-mac/blob/master/UnitTesting/GTMGoogleTestRunner.mm) is used to convert googletest cases to XCTest that can be run on iOS. GTMGoogleTestRunner doesn't execute the `main` function, so we can't have any test logic in `main`.
However, it's ok to call `::testing::InitGoogleTest` in `main`, as `GTMGoogleTestRunner` [calls InitGoogleTest](https://github.com/google/google-toolbox-for-mac/blob/master/UnitTesting/GTMGoogleTestRunner.mm#L151).
`grpc::testing::TestEnvironment` can also be called from `main`, as it does some test initialization (install crash handler, seed RNG) that's not strictly required to run testcases on iOS.
## Porting exising C++ tests to run on iOS
Please follow these guidelines when porting tests to run on iOS:
- Tests need to use the googletest framework
- Any setup/teardown code in `main` needs to be moved to `SetUpTestCase`/`TearDownTestCase`, and `TEST` needs to be changed to `TEST_F`.
- [Death tests](https://github.com/google/googletest/blob/master/googletest/docs/advanced.md#death-tests) are not supported on iOS, so use the `*_IF_SUPPORTED()` macros to ensure that your code compiles on iOS.
For example, the following test
```c++
TEST(MyTest, TestOne) {
ASSERT_DEATH(ThisShouldDie(), "");
}
int main(int argc, char** argv) {
grpc::testing::TestEnvironment env(argc, argv);
::testing::InitGoogleTest(&argc, argv);
grpc_init();
return RUN_ALL_TESTS();
grpc_shutdown();
}
```
should be changed to
```c++
class MyTest : public ::testing::Test {
protected:
static void SetUpTestCase() { grpc_init(); }
static void TearDownTestCase() { grpc_shutdown(); }
};
TEST_F(MyTest, TestOne) {
ASSERT_DEATH_IF_SUPPORTED(ThisShouldDie(), "");
}
int main(int argc, char** argv) {
grpc::testing::TestEnvironment env(argc, argv);
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
```
## Limitations
Due to a [limitation](https://github.com/google/google-toolbox-for-mac/blob/master/UnitTesting/GTMGoogleTestRunner.mm#L48-L56) in GTMGoogleTestRunner, `SetUpTestCase`/`TeardownTestCase` will be called before/after *every* individual test case, similar to `SetUp`/`TearDown`.
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