alist/hpptest

C++ behavior testing in one header

HPPTest

C++ behavior testing framework header modeled on Catch.

Structure

GIVEN("thing you're testing") {
  auto vec = new std::vector<int>();
  WHEN("doing this on first"){
    vec->push_back(1);
    THEN("it should look like this after") {
      ASSERT(vec->size() == 1);
      ASSERT(vec != 0); //multiple requires OK
    }
  }
  WHEN("doing this thing second (that intentionally fails)"){
    vec->pop_back();
    THEN("it should look like this after") {
      ASSERT(vec->size() == 0, (long int) vec->size()); //variadic endings printed
    }
  }
}
//next GIVEN goes here

prints…

GIVEN thing you're testing: Failed when #2
WHEN doing this thing second (that intentionally fails):
THEN it should look like this after… FAILS line 26: vec->size() == 0. values: (longint)vec->size() = -1
COMPLETED thing you're testing: 2 WHENs. Passing 1 of 2 THENs.

Features

• GIVEN is a for loop, running each WHEN separately
• Prints failed conditions and their line numbers
• ASSERT(condition, values...) has a variadic ending, to print values for failed conditions
• Prints WHEN count and THEN pass count after each GIVEN's completion, so you know how you're doing

Example

See example.cpp

Limitations

• Requires C++11 features like auto and unique_ptr found in GCC 4.7+ or Apple's Clang, with the -std=c++11 option.
• HPPTest only catches exceptions in ASSERT. Exceptions that occur in test setup are not caught.
• You must use braces {} after GIVEN, WHEN and THEN.
• If your ASSERTS have potential for nullptr, know HPPTest doesn't avoid segfaults. Instead use the ASSERT(TPtr(pointer) && pointer->member) pattern with the following snippet

bool ThrowFalse(bool c){ if (!c) {throw "ThrowFalse"; } return c; }
#define TPtr( a ) ThrowFalse(a != 0)

Test todo

Pull requests welcome!

• Write ASSERT_EXCEPTION for tests that ensure exceptions happen.
• Print pass/fail count of THENs on GIVEN completion

License?

I'm flattered! MIT License.