exercism/zig/rotational-cipher/test_rotational_cipher.zig

const std = @import("std");
const testing = std.testing;

const rotational_cipher = @import("rotational_cipher.zig");

test "rotate a by 0, same output as input" {
    const expected: []const u8 = "a";
    const actual = try rotational_cipher.rotate(testing.allocator, "a", 0);
    defer testing.allocator.free(actual);
    try testing.expectEqualStrings(expected, actual);
}

test "rotate a by 1" {
    const expected: []const u8 = "b";
    const actual = try rotational_cipher.rotate(testing.allocator, "a", 1);
    defer testing.allocator.free(actual);
    try testing.expectEqualStrings(expected, actual);
}

test "rotate a by 26, same output as input" {
    const expected: []const u8 = "a";
    const actual = try rotational_cipher.rotate(testing.allocator, "a", 26);
    defer testing.allocator.free(actual);
    try testing.expectEqualStrings(expected, actual);
}

test "rotate m by 13" {
    const expected: []const u8 = "z";
    const actual = try rotational_cipher.rotate(testing.allocator, "m", 13);
    defer testing.allocator.free(actual);
    try testing.expectEqualStrings(expected, actual);
}

test "rotate n by 13 with wrap around alphabet" {
    const expected: []const u8 = "a";
    const actual = try rotational_cipher.rotate(testing.allocator, "n", 13);
    defer testing.allocator.free(actual);
    try testing.expectEqualStrings(expected, actual);
}

test "rotate capital letters" {
    const expected: []const u8 = "TRL";
    const actual = try rotational_cipher.rotate(testing.allocator, "OMG", 5);
    defer testing.allocator.free(actual);
    try testing.expectEqualStrings(expected, actual);
}

test "rotate spaces" {
    const expected: []const u8 = "T R L";
    const actual = try rotational_cipher.rotate(testing.allocator, "O M G", 5);
    defer testing.allocator.free(actual);
    try testing.expectEqualStrings(expected, actual);
}

test "rotate numbers" {
    const expected: []const u8 = "Xiwxmrk 1 2 3 xiwxmrk";
    const actual = try rotational_cipher.rotate(testing.allocator, "Testing 1 2 3 testing", 4);
    defer testing.allocator.free(actual);
    try testing.expectEqualStrings(expected, actual);
}

test "rotate punctuation" {
    const expected: []const u8 = "Gzo'n zvo, Bmviyhv!";
    const actual = try rotational_cipher.rotate(testing.allocator, "Let's eat, Grandma!", 21);
    defer testing.allocator.free(actual);
    try testing.expectEqualStrings(expected, actual);
}

test "rotate all letters" {
    const expected: []const u8 = "Gur dhvpx oebja sbk whzcf bire gur ynml qbt.";
    const actual = try rotational_cipher.rotate(testing.allocator, "The quick brown fox jumps over the lazy dog.", 13);
    defer testing.allocator.free(actual);
    try testing.expectEqualStrings(expected, actual);
}