Add deterministic test sharding for distributed CI

build.zigmodified+10-0

Changes to build.zig

		⋯275 linesShow the 275 lines above this hunk@@ -276,6 +276,16 @@ pub fn build(b: *std.Build) void {
276	276	run_invalid_config.expectExitCode(2);
277	277	test_step.dependOn(&run_invalid_config.step);
278	278
	279	+ // Exercise both sides of a file-level shard split. One shard runs the
	280	+ // fixture and the other is intentionally empty; both are valid CI jobs.
	281	+ const run_shard_one = b.addRunArtifact(exe);
	282	+ run_shard_one.addArgs(&.{ "--test-dir", "tests", "--pattern", "sample.test.zig", "--shard-index", "1", "--shard-count", "2", "--no-color" });
	283	+ test_step.dependOn(&run_shard_one.step);
	284	+
	285	+ const run_shard_two = b.addRunArtifact(exe);
	286	+ run_shard_two.addArgs(&.{ "--test-dir", "tests", "--pattern", "sample.test.zig", "--shard-index", "2", "--shard-count", "2", "--no-color" });
	287	+ test_step.dependOn(&run_shard_two.step);
	288	+
279	289	const run_version = b.addRunArtifact(exe);
280	290	run_version.addArg("--version");
281	291	run_version.expectStdErrEqual(b.fmt("Zig Test Framework v{s}\n", .{package_version}));