refactor build system: separate test module and streamline test dependencies

build.zig

@@ -34,9 +34,18 @@ pub fn build(b: *std.Build) void
         .target           = target,
     });
 
+    const test_mod = b.createModule(.{
+        .root_source_file = b.path("src/root.zig"),
+        .target           = target,
+        .link_libc        = true,
+    });
+
     mod.addImport("toml", toml_dep.module("toml"));
     mod.addImport("args", args_dep.module("args"));
 
+    test_mod.addImport("toml", toml_dep.module("toml"));
+    test_mod.addImport("args", args_dep.module("args"));
+
     const exe = b.addExecutable(.{
         .name        = "zocket",
         .root_module = b.createModule(.{
@@ -66,20 +75,13 @@ pub fn build(b: *std.Build) void
     }
 
     const mod_tests = b.addTest(.{
-        .root_module = mod,
+        .root_module = test_mod,
     });
 
     const run_mod_tests = b.addRunArtifact(mod_tests);
 
-    const exe_tests  = b.addTest(.{
-        .root_module = exe.root_module,
-    });
-
-    const run_exe_tests = b.addRunArtifact(exe_tests);
-
     const test_step = b.step("test", "Run tests");
     test_step.dependOn(&run_mod_tests.step);
-    test_step.dependOn(&run_exe_tests.step);
 }
 
 fn getGitVersion(b: *std.Build) []const u8

src/root.zig

@@ -8,8 +8,10 @@ pub const memory  = @import("memory/util.zig");
 pub const signals = @import("signals/models.zig");
 pub const logging = @import("logging/log.zig");
 
+//
+
+const std = @import("std");
+
 test {
-    _ = config;
-    _ = memory;
-    _ = signals;
+    std.testing.refAllDecls(@This());
 }