template.

days/template/lib.zig

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+const std = @import("std");

days/template/main.zig

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+const std = @import("std");
+
+pub fn main() !void {
+    // Prints to stderr (it's a shortcut based on `std.io.getStdErr()`)
+    std.debug.print("All your {s} are belong to us.\n", .{"codebase"});
+
+    // stdout is for the actual output of your application, for example if you
+    // are implementing gzip, then only the compressed bytes should be sent to
+    // stdout, not any debugging messages.
+    const stdout_file = std.io.getStdOut().writer();
+    var bw = std.io.bufferedWriter(stdout_file);
+    const stdout = bw.writer();
+
+    try stdout.print("Run `zig build test` to run the tests.\n", .{});
+
+    try bw.flush(); // don't forget to flush!
+}
+
+test "simple test" {
+    var list = std.ArrayList(i32).init(std.testing.allocator);
+    defer list.deinit(); // try commenting this out and see if zig detects the memory leak!
+    try list.append(42);
+    try std.testing.expectEqual(@as(i32, 42), list.pop());
+}

days/template/part1.zig

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+const lib = @import("lib.zig");
+const std = @import("std");
+
+pub fn part1(comptime input: []const u8) i32 {
+    return input.len;
+}
+
+test "part1 sample" {
+    const input =
+        \\0
+    ;
+    try std.testing.expectEqual(part1(input), 11);
+}

days/template/part2.zig

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+const lib = @import("lib.zig");
+const std = @import("std");
+
+pub fn part2(comptime input: []const u8) i32 {
+    return input.len;
+}
+
+test "part2 sample" {
+    const input =
+        \\0
+    ;
+    try std.testing.expectEqual(part2(input), 1);
+}