"root" module is real root file when building executable, but is test_runner when testing

[iacore]

Zig Version

0.11.0

Steps to Reproduce and Observed Behavior

1. Create a zig file

pub const a = 1;
const b = @import("root").a;

pub fn main() void {
    _ = b;
}

test {
    _ = b;
}

2. Run zig build-exe hi.zig (works!)
3. Run zig test hi.zig (error)

hi.zig:2:26: error: root struct of file 'test_runner' has no member named 'a'
const b = @import("root").a;
          ~~~~~~~~~~~~~~~^~
referenced by:
    test_0: hi.zig:9:9
    remaining reference traces hidden; use '-freference-trace' to see all reference traces

Expected Behavior

I think they should behave the same.

Currently std.log changes behavior in test mode. Maybe it can only be done by swapping out the root module.

[Vexu]

Rejected as a proposal in #12201