From 3d6071b4961e0ab5e3b06cebf0092d65083a16ab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20Pu=C4=8Dil?= <petr.pucil@seznam.cz>
Date: Sun, 28 Sep 2025 23:09:54 +0200
Subject: [PATCH] Fix unintended compile error in build.zig example

As you can see at
https://web.archive.org/web/20250924165935/https://ziglang.org/learn/build-system/#testing,
this example failed to compile with:

```console
$ zig build test --summary all
/home/ci/actions-runner-website/_work/www.ziglang.org/www.ziglang.org/zig-code/build-system/unit-testing/build.zig:20:14: error: no field named 'root_source_file' in struct 'Build.TestOptions'
            .root_source_file = b.path("main.zig"),
             ^~~~~~~~~~~~~~~~
/home/ci/deps/zig-x86_64-linux-0.15.1/lib/std/Build.zig:856:25: note: struct declared here
pub const TestOptions = struct {
                        ^~~~~~
```

Despite the fact that this build.zig example apparently *should* fail to
compile (since it contains `build=fail` at the end), this is clearly not
the compile error that was intended. I'm sure of that because this
example is followed by the diff that should be enough to fix the compile
error: https://github.com/ziglang/www.ziglang.org/blob/a69386eea1310f74551870d92250005eb49c191a/content/en-US/learn/build-system.smd#L240-L252

> In this case it might be a nice adjustment to enable
> `skip_foreign_checks` for the unit tests:
>
> ```diff
> @@ -23,6 +23,7 @@
>          });
>
>          const run_unit_tests = b.addRunArtifact(unit_tests);
> +        run_unit_tests.skip_foreign_checks = true;
>          test_step.dependOn(&run_unit_tests.step);
>      }
>  }
> ```

Therefore, this commit fixes the above compile error by following the
build.zig example with this `skip_foreign_checks` patch applied:
https://github.com/ziglang/www.ziglang.org/blob/a69386eea1310f74551870d92250005eb49c191a/zig-code/build-system/unit-testing-skip-foreign/build.zig#L20-L23
---
 zig-code/build-system/unit-testing/build.zig | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/zig-code/build-system/unit-testing/build.zig b/zig-code/build-system/unit-testing/build.zig
index 238ed12fd..b97db6d08 100644
--- a/zig-code/build-system/unit-testing/build.zig
+++ b/zig-code/build-system/unit-testing/build.zig
@@ -17,8 +17,10 @@ pub fn build(b: *std.Build) void {
 
     for (test_targets) |target| {
         const unit_tests = b.addTest(.{
-            .root_source_file = b.path("main.zig"),
-            .target = b.resolveTargetQuery(target),
+            .root_module = b.createModule(.{
+                .root_source_file = b.path("main.zig"),
+                .target = b.resolveTargetQuery(target),
+            }),
         });
 
         const run_unit_tests = b.addRunArtifact(unit_tests);