zig/lib/std/crypto/test.zig

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

// Hash using the specified hasher `H` asserting `expected == H(input)`.
pub fn assertEqualHash(comptime Hasher: var, comptime expected: []const u8, input: []const u8) void {
    var h: [expected.len / 2]u8 = undefined;
    Hasher.hash(input, h[0..]);

    assertEqual(expected, &h);
}

// Assert `expected` == `input` where `input` is a bytestring.
pub fn assertEqual(comptime expected: []const u8, input: []const u8) void {
    var expected_bytes: [expected.len / 2]u8 = undefined;
    for (expected_bytes) |*r, i| {
        r.* = fmt.parseInt(u8, expected[2 * i .. 2 * i + 2], 16) catch unreachable;
    }

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