Zig build test cannot find module named "token" available within module "root"

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1

I have been attempting to write a lexer in zig. I wanted to add some unit tests for the lexer and so i added this to the default build.zig generated with zig init.

const lexer_tests = b.addTest(.{
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/assembler/lexer/test.zig"),
            .optimize = optimize,
            .target = target
        })
    });
    const run_lexer_tests = b.addRunArtifact(lexer_tests);

// ...

test_step.dependOn(&run_lexer_tests.step);

I also declared two important modules that will be used within my project widely:

const token_mod = b.createModule(.{ .root_source_file = b.path("src/assembler/token.zig"), .target = target, .optimize = optimize });

    const isa_mod = b.createModule(.{ .root_source_file = b.path("src/vm/isa.zig"), .target = target, .optimize = optimize });

const exe = b.addExecutable(.{
        .name = "irvm",
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/main.zig"),
            .target = target,
            .optimize = optimize,
            .imports = &.{
                .{ .name = "irvm", .module = root_mod },
                .{ .name = "token", .module = token_mod },
                .{ .name = "isa", .module = isa_mod },
            },
        }),
    });

when attempting to run zig build test i get this error:

src/assembler/lexer/test.zig:5:27: error: no module named 'token' available within module 'root'
const TokenKind = @import("token").TokenKind;

I have been attempting to fix this for a while, but my lack of knowledge on how zig’s build system works has stopped me from making any progress. Does anyone know where I went wrong?

2

you need to add the imports to your test

3

Could you please clarify?

4

The module you create for testing doesn’t add the import(s) that the test code requires.

You add imports the same way you did with your main executable.

5

thank you! This has fixed the issue.

6

Just as a follow-up:

These can be ‘hoisted’ like so:

const module_imports: []const Import = &.{
    .{ .name = "irvm", .module = root_mod },
    .{ .name = "token", .module = token_mod },
    .{ .name = "isa", .module = isa_mod },
};

Then reused everywhere they’re needed. Less fussing about if and when more imports happen (as they tend to).

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