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We need to maintain legacy applications that were not built to facilitate unit testing. Without Typemock we would be completely unable to effectively test these applications. Typemock boosts productivity because you do not have to explicitly code from the ground up with testing in mind, which can be difficult to handle. Typemock has been able to cover up the coupling and dependency sins that we all have leaked into our applications from time to time.  
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 « Isolator++ Beta Released | Main

What Is Isolator++?

Typemock Isolator++ is a new unit testing tool for C++. With its API, you can test your C++ code, and isolate the code under test from dependencies (like other classes). Let’s walk through an example to show what that means.

Let’s say I have a Product class. This class has a GetPrice() function:

int Product::GetPrice(PricingManager* manager)
      if (manager->isOnSale())
            return 5;
            return 10;


As you can see, the GetPrice() function has a dependency: the PricingManager pointer it receives as an argument. The PricingManager’s isOnSale() method looks like this:

bool PricingManager::isOnSale()
     return false;


It always returns false. I want to test my Product, with both cases – when we have a sale or not. But I don’t want to change the code of isOnSale() just for a test. Maybe I can’t touch it.

This is where Isolator++ helps. It allows you to change the behavior of dependencies, without changing the code.

I’ll create two tests (for a step-by-step guide, read the “Getting Started” section). For the first scenario, where there is no sale, here’s the test:

TEST_F(IsolatorTests, GetPrice_OnSaleIsFalse_ExpectHighPrice)
     Product product;
     PricingManager* manager =  new PricingManager();
     ASSERT_EQ(10, product.GetPrice(manager));


Since manager->isOnSale() always returns false, the GetPrice() function always returns 10.

However, the second case is different. I want manager->isOnSale() to return true, but without changing the code. Here’s how the test looks like:

TEST_F(IsolatorTests, GetPrice_OnSaleIsTrue_ExpectLowPrice)
      Product product;
      PricingManager* fakeManager = FAKE(PricingManager);
      ASSERT_EQ(5, product.GetPrice(fakeManager));


I’m using Isolator++’s FAKE macro to create a fake a PricingManager instance (although from a type point of view, this is a regular PricingManager pointer). After that, I’m using Isolator++ to specify the return value true, I want the isOnSale method to return. Finally, I’m testing the expected return value 5.

Isolator++ has many more features. You can learn more in other posts coming up.