Add deterministic test sharding for distributed CI

tests/cli_test.zigmodified+23-0

Changes to tests/cli_test.zig

		⋯23 linesShow the 23 lines above this hunk@@ -24,12 +24,33 @@ test "CLI rejects missing and invalid values" {
24	24	try std.testing.expectError(ztf.cli.CLIError.InvalidArgument, invalid.parse(&.{ "zig-test", "--jobs", "0" }));
25	25	}
26	26
	27	+test "CLI parses and validates one-based sharding" {
	28	+ var cli = ztf.CLI.init(std.testing.allocator);
	29	+ try cli.parse(&.{ "zig-test", "--shard-index", "2", "--shard-count", "4" });
	30	+ try std.testing.expectEqual(@as(?usize, 2), cli.options.shard_index);
	31	+ try std.testing.expectEqual(@as(?usize, 4), cli.options.shard_count);
	32	+
	33	+ var missing_count = ztf.CLI.init(std.testing.allocator);
	34	+ try std.testing.expectError(
	35	+ ztf.cli.CLIError.InvalidArgument,
	36	+ missing_count.parse(&.{ "zig-test", "--shard-index", "1" }),
	37	+ );
	38	+
	39	+ var out_of_range = ztf.CLI.init(std.testing.allocator);
	40	+ try std.testing.expectError(
	41	+ ztf.cli.CLIError.InvalidArgument,
	42	+ out_of_range.parse(&.{ "zig-test", "--shard-index", "3", "--shard-count", "2" }),
	43	+ );
	44	+}
	45	+
27	46	test "CLI flags override configuration defaults" {
28	47	var cli = ztf.CLI.init(std.testing.allocator);
29	48	var config = ztf.TestConfig{};
30	49	config.test_options.test_dir = "configured-tests";
31	50	config.test_options.filter = "configured-filter";
32	51	config.test_options.recursive = false;
	52	+ config.sharding.index = 1;
	53	+ config.sharding.count = 3;
33	54	config.reporter.verbose = true;
34	55
35	56	try cli.applyConfig(config);
		⋯3 linesShow the 3 lines above this hunk@@ -39,4 +60,6 @@ test "CLI flags override configuration defaults" {
39	60	try std.testing.expectEqualStrings("cli-filter", cli.options.filter.?);
40	61	try std.testing.expect(cli.options.no_recursive);
41	62	try std.testing.expect(cli.options.verbose);
	63	+ try std.testing.expectEqual(@as(?usize, 1), cli.options.shard_index);
	64	+ try std.testing.expectEqual(@as(?usize, 3), cli.options.shard_count);
42	65	}