zig/test/behavior/error.zig

const std = @import("std");
const expect = std.testing.expect;
const expectError = std.testing.expectError;
const expectEqual = std.testing.expectEqual;
const mem = std.mem;

test "error values" {
    const a = @errorToInt(error.err1);
    const b = @errorToInt(error.err2);
    try expect(a != b);
}

test "redefinition of error values allowed" {
    shouldBeNotEqual(error.AnError, error.SecondError);
}
fn shouldBeNotEqual(a: anyerror, b: anyerror) void {
    if (a == b) unreachable;
}

test "error binary operator" {
    const a = errBinaryOperatorG(true) catch 3;
    const b = errBinaryOperatorG(false) catch 3;
    try expect(a == 3);
    try expect(b == 10);
}
fn errBinaryOperatorG(x: bool) anyerror!isize {
    return if (x) error.ItBroke else @as(isize, 10);
}

test "empty error union" {
    const x = error{} || error{};
    _ = x;
}