luau/tests/TypeInfer.negations.test.cpp

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// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#include "Fixture.h"
#include "Luau/ToString.h"
#include "doctest.h"
#include "Luau/Common.h"
#include "ScopedFlags.h"
using namespace Luau;
namespace
{
struct NegationFixture : Fixture
{
TypeArena arena;
NegationFixture()
{
registerHiddenTypes(&frontend);
}
};
} // namespace
TEST_SUITE_BEGIN("Negations");
TEST_CASE_FIXTURE(NegationFixture, "negated_string_is_a_subtype_of_string")
{
CheckResult result = check(R"(
function foo(arg: string) end
local a: string & Not<"Hello">
foo(a)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(NegationFixture, "string_is_not_a_subtype_of_negated_string")
{
CheckResult result = check(R"(
function foo(arg: string & Not<"hello">) end
local a: string
foo(a)
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
}
TEST_CASE_FIXTURE(Fixture, "cofinite_strings_can_be_compared_for_equality")
{
CheckResult result = check(R"(
function f(e)
if e == 'strictEqual' then
e = 'strictEqualObject'
end
if e == 'deepStrictEqual' or e == 'strictEqual' then
elseif e == 'notDeepStrictEqual' or e == 'notStrictEqual' then
end
return e
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK("(string) -> string" == toString(requireType("f")));
}
TEST_CASE_FIXTURE(NegationFixture, "compare_cofinite_strings")
{
CheckResult result = check(R"(
local u : Not<"a">
local v : "b"
if u == v then
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_SUITE_END();