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// Copyright (c) 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/common/state_transitions.h"
#include <ostream>
#include <string>
#include "base/test/gtest_util.h"
#include "build/build_config.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace content {
enum class State { kState1 = 0, kState2, kState3, kState4 };
std::ostream& operator<<(std::ostream& o, const State& s) {
return o << static_cast<int>(s);
}
TEST(StateTransitionsTest, Constructor) {
// No expectations, just make sure the constructor works.
const StateTransitions<State> transitions({
{State::kState1, {State::kState2, State::kState3}},
{State::kState2, {State::kState3, State::kState4}},
});
}
TEST(StateTransitionsTest, GetValidTransitions) {
const StateTransitions<State> transitions({
{State::kState1, {State::kState2, State::kState3}},
{State::kState2, {State::kState3, State::kState4}},
});
EXPECT_THAT(transitions.GetValidTransitions(State::kState1),
testing::ElementsAre(State::kState2, State::kState3));
EXPECT_THAT(transitions.GetValidTransitions(State::kState2),
testing::ElementsAre(State::kState3, State::kState4));
EXPECT_THAT(transitions.GetValidTransitions(State::kState3),
testing::ElementsAre());
EXPECT_THAT(transitions.GetValidTransitions(State::kState4),
testing::ElementsAre());
}
TEST(StateTransitionsTest, IsTransitionValid) {
const StateTransitions<State> transitions({
{State::kState1, {State::kState2, State::kState3}},
{State::kState2, {State::kState3, State::kState4}},
});
ASSERT_TRUE(transitions.IsTransitionValid(State::kState1, State::kState2));
ASSERT_TRUE(transitions.IsTransitionValid(State::kState2, State::kState3));
ASSERT_FALSE(transitions.IsTransitionValid(State::kState1, State::kState4));
// kState3 was omitted from the definition.
ASSERT_FALSE(transitions.IsTransitionValid(State::kState3, State::kState4));
}
TEST(StateTransitionsTest, DCHECK_STATE_TRANSITION) {
const StateTransitions<State> transitions({
{State::kState1, {State::kState2, State::kState3}},
{State::kState2, {State::kState3, State::kState4}},
});
DCHECK_STATE_TRANSITION(&transitions, State::kState1, State::kState2);
DCHECK_STATE_TRANSITION(&transitions, State::kState2, State::kState3);
#if DCHECK_IS_ON()
// EXPECT_DEATH is not defined on IOS.
#ifndef OS_IOS
EXPECT_DEATH(
DCHECK_STATE_TRANSITION(&transitions, State::kState1, State::kState4),
"Check failed.*Invalid transition: 0 -> 3");
// kState3 was omitted from the definition.
EXPECT_DEATH(
DCHECK_STATE_TRANSITION(&transitions, State::kState3, State::kState4),
"Check failed.*Invalid transition: 2 -> 3");
#endif // !OS_IOS
#endif // DCHECK_IS_ON()
}
// Test that everything works OK with some other data type.
TEST(StateTransitionsTest, NonEnum) {
const StateTransitions<std::string> transitions({
{"state1", {"state2", "state3"}},
{"state2", {"state3", "state4"}},
});
ASSERT_TRUE(transitions.IsTransitionValid("state1", "state2"));
ASSERT_TRUE(transitions.IsTransitionValid("state2", "state3"));
ASSERT_FALSE(transitions.IsTransitionValid("state1", "state4"));
// kState3 was omitted from the definition.
ASSERT_FALSE(transitions.IsTransitionValid("state3", "state4"));
DCHECK_STATE_TRANSITION(&transitions, "state1", "state2");
DCHECK_STATE_TRANSITION(&transitions, "state2", "state3");
// Try some states that are not in the specification at all.
ASSERT_FALSE(transitions.IsTransitionValid("foo", "state2"));
ASSERT_FALSE(transitions.IsTransitionValid("state1", "foo"));
ASSERT_FALSE(transitions.IsTransitionValid("foo", "bar"));
}
} // namespace content
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