1pub fn build(b: *Build) void {
 2    const exe = b.addExecutable(.{
 3        .name = "check_file_exists",
 4        .root_module = b.createModule(.{
 5            .target = b.graph.host,
 6            .optimize = .Debug,
 7            .root_source_file = b.path("check_file_exists.zig"),
 8        }),
 9    });
10
11    const test_step = b.step("test", "Test it");
12    b.default_step = test_step;
13
14    test_step.dependOn(addCheck(b, exe, ".", null));
15    test_step.dependOn(addCheck(b, exe, "..", b.path("..")));
16    test_step.dependOn(addCheck(b, exe, "exe dir", exe.getEmittedBin().dirname()));
17    test_step.dependOn(addCheck(b, exe, "exe dir/..", exe.getEmittedBin().dirname().dirname()));
18    test_step.dependOn(addCheck(b, exe, "./empty_dir", b.path("empty_dir")));
19}
20
21fn addCheck(b: *Build, exe: *Build.Step.Compile, cwd_name: []const u8, opt_cwd: ?Build.LazyPath) *Build.Step {
22    const run = b.addRunArtifact(exe);
23    if (opt_cwd) |cwd| run.setCwd(cwd);
24    run.addFileArg(b.path("file_that_exists.txt"));
25    run.setName(b.fmt("check in '{s}'", .{cwd_name}));
26    run.expectExitCode(0);
27    return &run.step;
28}
29
30const Build = @import("std").Build;