some tests

build.zig

@@ -47,8 +47,56 @@ pub fn build(b: *std.Build) !void {
         run_cmd.addArgs(args);
     }
 
+    try compileTestApplications(b, target, optimize, false, false);
+    try compileTestApplications(b, target, optimize, false, true);
+    try compileTestApplications(b, target, optimize, true, true);
+
     const exe_tests = b.addTest(.{ .root_module = mod });
     const run_exe_tests = b.addRunArtifact(exe_tests);
     const test_step = b.step("test", "Run tests");
+    test_step.dependOn(b.getInstallStep());
     test_step.dependOn(&run_exe_tests.step);
 }
+
+pub fn compileTestApplications(
+    b: *std.Build,
+    target: std.Build.ResolvedTarget,
+    optimize: std.builtin.OptimizeMode,
+    comptime link_libc: bool,
+    comptime pie: bool,
+) !void {
+    // Compile test applications
+    const test_path = "src/test/";
+    const test_prefix = prefix: {
+        const p1 = "test_" ++ if (link_libc) "libc_" else "nolibc_";
+        const p2 = p1 ++ if (pie) "pie_" else "nopie_";
+        break :prefix p2;
+    };
+    var test_dir = try std.fs.cwd().openDir(test_path, .{ .iterate = true });
+    defer test_dir.close();
+    var iterator = test_dir.iterate();
+    while (try iterator.next()) |entry| {
+        if (entry.kind != .file) continue;
+        if (!std.mem.endsWith(u8, entry.name, ".zig")) continue;
+
+        const name = try std.mem.concat(b.allocator, u8, &.{
+            test_prefix, entry.name[0 .. entry.name.len - 4], // strip .zig suffix
+        });
+        const test_executable = b.addExecutable(.{
+            .name = name,
+            .root_module = b.createModule(.{
+                .root_source_file = b.path(b.pathJoin(&.{ test_path, entry.name })),
+                .optimize = optimize,
+                .target = target,
+                .link_libc = link_libc,
+                .link_libcpp = false,
+                .pic = pie,
+            }),
+            .linkage = if (link_libc) .dynamic else .static,
+            .use_llvm = true,
+            .use_lld = true,
+        });
+        test_executable.pie = pie;
+        b.installArtifact(test_executable);
+    }
+}