Custom format not shown in test

[copper willow]

const std = @import("std");
const print = std.debug.print;

const Person = struct {
    name: []const u8,
    birth_year: i32,
    death_year: ?i32,

    pub fn format(
        self: Person,
        comptime fmt: []const u8,
        options: std.fmt.FormatOptions,
        writer: anytype,
    ) !void {
        _ = fmt;
        _ = options;
        try writer.print("{s} ({d}-", .{ self.name, self.birth_year });
        try writer.writeAll(")");
    }
};

test "custom printing" {
    const j = Person{
        .name = "John",
        .birth_year = 1987,
        .death_year = undefined,
    };
    print("j: {s}", .{j});
    print("TEST", .{});
}

Even the last print is not shown, so I suspect it has to do with the way I invoke zig test or something relevant, but the goal is to see the custom format of the Person struct on the screen.

[brisk rapids]

print a newline before anything else and it'll appear

it's getting overwritten by the progress bar & status

though I would recommend you not rely on printing in tests for anything other than debugging

unit tests are generally meant to be declarative

if your aim is to test the behaviour of the formatting function, you can do:

try std.testing.expectFmt("j: John (1987)-)", "j: {}", .{j});