QTest - doesn't compile after adding second round/class of tests.

[artwaw]

Good afternoon,
I decided to learn something new recently - QTest. I wrote tests for one of my classes and it did the job, allowed to find some otherwise hard to spot problems, so when I wrote another complex thing I decided to write tests for that too. But once it was ready to compile I got an error. No doubt I did something silly because I misunderstood the docs, but I am puzzled.

Please bear in mind that it worked flawlessly until I added second test.

Structure:

• I have a lib called core where the classes to be tested come from;
• original, working test is for the class ConfigFile. Test is in tst_configfile.cpp
• additional one is for the class HistoryClass, test in tst_historyclass.cpp

The error I get is:

suplicate symbol '_main' in:
    [...]Tests.dir/core/tst_historyclass.cpp.o
    [...]Tests.dir/core/tst_configfile.cpp.o
ld: 1 duplicate symbols
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

Excerpt from the CMakeLists:

set(includes
    "../src/core/"
)

set(SOURCES
	core/tst_configfile.cpp
        core/tst_historyclass.cpp
)

add_executable(GemBrowserTests ${SOURCES} )
target_include_directories(GemBrowserTests PRIVATE "core")
target_include_directories(GemBrowserTests PRIVATE ${includes})

add_test(NAME ConfigFile COMMAND ConfigFile)
add_test(NAME HistoryClass COMMAND HistoryClass)

and includes follow, those didn't even change.
What I don't understand here?

As usual, many thanks in advance.

[Christian Ehrlicher]

You can add as many add_executable() to a CMakeLists.txt as you want.
Qt is using one test executable per class which I also consider as a good practice for unit tests.

[Christian Ehrlicher]

You can only have one QTest main, simply create two executables

[artwaw]

@Christian-Ehrlicher stupid question: can I do that in the same CMake project, by means of another add_executable()?

Less silly question: what is considered a good practice in my case, where I want to test multiple classes? How do I construct tests for them? Separate tree of projects/CMakeLists.txt files?

[Christian Ehrlicher]

You can add as many add_executable() to a CMakeLists.txt as you want.
Qt is using one test executable per class which I also consider as a good practice for unit tests.

[artwaw]

Awesome @Christian-Ehrlicher - I shall proceed in that direction. Thank you!

[Christian Ehrlicher]

You should also take a look on add_test() - https://cmake.org/cmake/help/latest/command/add_test.html - to execute e.g. all tests at once.