    const std = @import("../std.zig");
    const testing = std.testing;
    const fmt = std.fmt;

    // Hash using the specified hasher `H` asserting `expected == H(input)`.

    pub fn assertEqualHash(comptime Hasher: anytype, comptime expected_hex: *const [Hasher.digest_length * 2:0]u8, input: []const u8) !void {
        var h: [Hasher.digest_length]u8 = undefined;
        Hasher.hash(input, &h, .{});

        try assertEqual(expected_hex, &h);
    }

    // Assert `expected` == hex(`input`) where `input` is a bytestring

    pub fn assertEqual(comptime expected_hex: [:0]const u8, input: []const u8) !void {
        var expected_bytes: [expected_hex.len / 2]u8 = undefined;
        for (&expected_bytes, 0..) |*r, i| {
            r.* = fmt.parseInt(u8, expected_hex[2 * i .. 2 * i + 2], 16) catch unreachable;
        }

        try testing.expectEqualSlices(u8, &expected_bytes, input);
    }