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# C++ testing guide
C++ tests use a modified version of the [Tut test framework](https://mrzechonek.github.io/tut-framework/).
Test files are placed in test/cxx/SomethingTest.cpp.
## Test suite example
```c++
#include <TestSupport.h> // Always include this
#include <Something.h> // The class to test
// Always use these namespaces
using namespace std;
using namespace boost;
using namespace Passenger;
namespace tut {
// Each test suite has a corresponding context struct, created and
// deleted for every test case. You can put test case-local state here.
struct SomethingTest: public TestBase {
Something something;
};
TEST_METHOD(1) {
set_test_name("Description for test 1");
// Test logic here.
// `this` is a SomethingTest instance.
ensure_equals("Description for assertion 1", 1, something.foo());
ensure_equals("Description for assertion 2", 2, something.bar());
}
TEST_METHOD(2) {
set_test_name("Description for test 2");
// Test logic here.
// `this` is a SomethingTest instance.
}
}
```
## Available assertions
- `ensure([description,] bool)` — Asserts argument is true.
- `ensure_not([description,] bool)`
- `ensure_equals([description,] actual, expected)` — Asserts `actual == expected`.
- `ensure_not_equals([description,] actual, expected)`
- `ensure_gt(description, a, b)` — Asserts `a > b`.
- `ensure_distance([description,] a, b, d)` — Asserts the distance between `a` and `b` is <= `d`.
- `fail(description)` — Fails the test case.
### Special assertions for multithreaded code
- `EVENTUALLY(deadlineSeconds, code)` — Asserts that "something eventually happens".
Runs `code` in a loop, sleeping for 10 msec each time, until code set `result = true` or timeout.
Example:
```c++
EVENTUALLY(5,
result = fileExists("foo.txt");
);
```
Notes:
- `code` is in a new lexical context, so defining variables there is fine.
- Since EVENTUALLY is for multithreaded use cases, remember to synchronize access to shared state.
- `EVENTUALLY2(deadlineMsec, sleeptimeMsec, code)` — Same as EVENTUALLY but with finer timing customization.
- `SHOULD_NEVER_HAPPEN(deadlineMsec, code)` — Asserts that "something should never happen".
Runs `code` in a loop for `deadlineMsec`. If `code` sets `result = true`, the test fails.
Example:
```c++
SHOULD_NEVER_HAPPEN(1000,
result = checkSocketDisconnected();
);
```
The notes for `EVENTUALLY()` also apply here.
## Mocking
See [C++ mocking strategy](CxxMockingStrategy.md).
## Running tests
Prerequisite: ensure `test/config.json` exists. Refer to its `.example` file.
```bash
# Run all test suites
rake test:cxx GROUPS=SomethingTest
# Run specific test suites
rake test:cxx GROUPS=SomethingTest,AnotherTest
# Run specific tests by number
rake test:cxx GROUPS=SomethingTest:1,3
# Attach to GDB or LLDB
rake test:cxx GROUPS=SomethingTest GDB=1
rake test:cxx GROUPS=SomethingTest LLDB=1
```