Test Double Sample

Introduction

This example using a C++ test class cover the application of test doubles. Please read the Using Test Doubles article before proceeding in order to understand the concepts. You may also find it helpful to review the information available here for more details on test double terminology.

Tests Description

Basic::TestFunction

This case validate test_func1 function (implemented in s2_testdouble_function.h/c) which in turn depends on depend1 function (in s2_testdouble_depend.h/c). Since the caller (test_func1) and the callee (depend1) are in separate compilation units the depencency is captured for interception (via scl_function pragma in) using "DEFINITION" and "IMPLICIT" options.

CallNoDoubling

Simple case to demonstrate operation where no doubling is used. The true depend1 is used when testing test_func1.

CallWithFake

Dynamically replaces dependency depend1 with a fake fake_depend_1 function, which simply returns a constant.

CallWithMock

Dynamically replaces dependency depend1 with a mock mock_depend_1 function, which validates the passed in parameter and proceeds as the original depend1.

Basic::TestFunctionWithDepend

This example uses a C++ test class to validate the test_func2 function under test. The dependency depend2 is left in place during the CallNoDoubling method. The dependency is replaced with a fake method, which simply returns a constant in the CallWithFake method. The dependency is replaced with a mock method, which validates the passed in parameter, in the CallWithMock method.
The intercept mangling parameters in this example, in the scl_function pragma, uses the "REFERENCE" option to indicate the the intercept will be at the function call, and the"EXPLICIT" option because mangling is required to intercept (because the caller and callee reside in the same source file).