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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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53 lines
2.2 KiB
53 lines
2.2 KiB
5 years ago
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## C++ tests on iOS
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[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`.
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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).
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`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.
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## Porting exising C++ tests to run on iOS
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Please follow these guidelines when porting tests to run on iOS:
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- Tests need to use the googletest framework
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- Any setup/teardown code in `main` needs to be moved to `SetUpTestCase`/`TearDownTestCase`, and `TEST` needs to be changed to `TEST_F`.
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- [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.
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For example, the following test
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```c++
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TEST(MyTest, TestOne) {
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ASSERT_DEATH(ThisShouldDie(), "");
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}
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int main(int argc, char** argv) {
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grpc::testing::TestEnvironment env(argc, argv);
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::testing::InitGoogleTest(&argc, argv);
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grpc_init();
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return RUN_ALL_TESTS();
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grpc_shutdown();
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}
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```
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should be changed to
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```c++
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class MyTest : public ::testing::Test {
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protected:
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static void SetUpTestCase() { grpc_init(); }
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static void TearDownTestCase() { grpc_shutdown(); }
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};
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TEST_F(MyTest, TestOne) {
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ASSERT_DEATH_IF_SUPPORTED(ThisShouldDie(), "");
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}
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int main(int argc, char** argv) {
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grpc::testing::TestEnvironment env(argc, argv);
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::testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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```
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## Limitations
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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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