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Editorial Team
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Asked: 2026-06-10T14:09:48+00:00

Is there a way to write unit tests so that they can be compiled

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Is there a way to write unit tests so that they can be compiled and run both with Delphi and Free Pascal?

There are different unit test frameworks for Delphi and Free Pascal, which causes duplicate work for developers who target both compilers (for example, library and framework developers).

So maybe there is a way, using either the DUnit or the FPCUnit framework and tweak the test case source code (or the framework itself) so that it also works with the other compiler.

So essentially the question is:

  • which framework (DUnit or FPCUnit) can be compiled with both compilers (Delphi and Free Pascal) with as little modifications as possible?

or

  • is there a third framework (Thanks to Arnaud for mentioning TSynTest) which works with Delphi and FPC?
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1 Answer

  1. Editorial Team

    Default unit test framework for Free Pascal is FPCUnit, it has the same design as DUnit but different from it in minor details. You can write common unit tests for FPCUnit and DUnit by circumventing the differences by {$IFDEF FPC}. I just tested FPCUnit, it is a usable framework, and blogged about it.

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