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This patch introduces a new operator== to compare an Optional to its contained type directly. If the Optional does not contain a value, the comparison will always return false. This also adds a test case for the new behavior as well as comparison between Optional objects themselves.
99 lines
2.0 KiB
C++
99 lines
2.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <AK/Optional.h>
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#include <AK/String.h>
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TEST_CASE(basic_optional)
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{
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Optional<int> x;
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EXPECT_EQ(x.has_value(), false);
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x = 3;
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EXPECT_EQ(x.has_value(), true);
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EXPECT_EQ(x.value(), 3);
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}
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TEST_CASE(move_optional)
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{
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Optional<int> x;
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EXPECT_EQ(x.has_value(), false);
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x = 3;
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EXPECT_EQ(x.has_value(), true);
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EXPECT_EQ(x.value(), 3);
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Optional<int> y;
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y = move(x);
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EXPECT_EQ(y.has_value(), true);
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EXPECT_EQ(y.value(), 3);
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EXPECT_EQ(x.has_value(), false);
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}
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TEST_CASE(optional_leak_1)
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{
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struct Structure {
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Optional<String> str;
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};
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// This used to leak, it does not anymore.
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Vector<Structure> vec;
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vec.append({ "foo" });
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EXPECT_EQ(vec[0].str.has_value(), true);
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EXPECT_EQ(vec[0].str.value(), "foo");
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}
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TEST_CASE(short_notation)
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{
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Optional<StringView> value = "foo";
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EXPECT_EQ(value->length(), 3u);
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EXPECT_EQ(*value, "foo");
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}
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TEST_CASE(comparison_without_values)
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{
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Optional<StringView> opt0;
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Optional<StringView> opt1;
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Optional<String> opt2;
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EXPECT_EQ(opt0, opt1);
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EXPECT_EQ(opt0, opt2);
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}
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TEST_CASE(comparison_with_values)
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{
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Optional<StringView> opt0;
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Optional<StringView> opt1 = "foo";
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Optional<String> opt2 = "foo";
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Optional<StringView> opt3 = "bar";
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EXPECT_NE(opt0, opt1);
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EXPECT_EQ(opt1, opt2);
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EXPECT_NE(opt1, opt3);
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}
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TEST_CASE(comparison_to_underlying_types)
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{
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Optional<String> opt0;
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EXPECT_NE(opt0, String());
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EXPECT_NE(opt0, "foo");
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Optional<StringView> opt1 = "foo";
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EXPECT_EQ(opt1, "foo");
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EXPECT_NE(opt1, "bar");
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EXPECT_EQ(opt1, String("foo"));
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}
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TEST_CASE(comparison_with_numeric_types)
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{
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Optional<u8> opt0;
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EXPECT_NE(opt0, 0);
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Optional<u8> opt1 = 7;
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EXPECT_EQ(opt1, 7);
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EXPECT_EQ(opt1, 7.0);
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EXPECT_EQ(opt1, 7u);
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EXPECT_NE(opt1, -2);
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}
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