Modern C++ Programming with Test-Driven Development

9.6 Still Simply Test-Driving

We move on to designing the ThreadPool class. Before we introduce threads, we test-drive some building blocks for handling requests.

#include "CppUTest/TestHarness.h"
#include "ThreadPool.h"

using namespace std;

TEST_GROUP(AThreadPool) {
   ThreadPool pool;
};

TEST(AThreadPool, HasNoWorkOnCreation) {
   CHECK_FALSE(pool.hasWork());
}

TEST(AThreadPool, HasWorkAfterAdd) {
   pool.add(Work{});
   CHECK_TRUE(pool.hasWork());
}

TEST(AThreadPool, AnswersWorkAddedOnPull) {
   pool.add(Work{1});
   auto work = pool.pullWork();

   LONGS_EQUAL(1, work.id());
}

TEST(AThreadPool, PullsElementsInFIFOOrder) {
   pool.add(Work{1});
   pool.add(Work{2});
   auto work = pool.pullWork(); ...