Unit test with external module

[dimdin]

Your module and test setup looks correct for zig build test. It must be a reference problem.

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@braddabug

Is there a way to run the tests in a single file and also reference modules?

There is a way to specify modules in the zig test command line using the --dep and -M flags.
But it is better to use the builder to produce this command line using zig build test.

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@braddabug

Is there a way to add all my unit tests automatically without having to use Builder.addTest() on every single file with a test?

Inside your src/main.zig you must reference all declarations so that the zig compiler includes them in the test compilation.
You can reference all the declarations in a module using std.testing.refAllDecls or std.testing.refAllDeclsRecursive

test {
    std.testing.refAllDecls(@This());
}

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@braddabug

Is there any documentation for testing that goes beyond “just run zig test [filename]”?

see: 4) Run your test suite exposed with std.testing.refAllDecls

Run your tests using: zig build test --summary all or new

  --summary [mode]             Control the printing of the build summary
    all                        Print the build summary in its entirety
    new                        Omit cached steps
    failures                   (Default) Only print failed steps
    none                       Do not print the build summary