framework/fsm/state_test.go

// Copyright (C) 2016 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package fsm_test

import (
	"testing"

	"android.googlesource.com/platform/tools/gpu/framework/assert"
	"android.googlesource.com/platform/tools/gpu/framework/fsm"
	"android.googlesource.com/platform/tools/gpu/framework/log"
)

func TestDuplicateState(t *testing.T) {
	ctx := assert.Context(t)
	_, err := fsm.Compile(fsm.FSM{
		States: []fsm.State{
			{Name: "A"},
			{Name: "A"},
		},
	})
	assert.With(ctx).ThatError(err).HasMessage("Duplicate state name A")
}

func TestNoState(t *testing.T) {
	ctx := assert.Context(t)
	_, err := fsm.Compile(fsm.FSM{})
	assert.With(ctx).ThatError(err).HasMessage("No states specified")
}

func TestCorrectName(t *testing.T) {
	ctx := assert.Context(t)
	newState := func(name string) fsm.State {
		return fsm.Do(name, func(ctx log.Context) error {
			assert.For(ctx, "state").That(fsm.Get(ctx).State()).Equals(name)
			return nil
		})
	}
	fsm.Run(ctx, fsm.MustCompile(fsm.FSM{
		States: []fsm.State{
			newState("A"),
			newState("B"),
			newState("C"),
		},
		Transitions: []fsm.Transition{
			{From: "A", To: "B"},
			{From: "B", Event: "doc", To: "C"},
		},
	}))
}

func TestBadInitialState(t *testing.T) {
	ctx := assert.Context(t)
	_, err := fsm.Compile(fsm.FSM{
		Initial: "B",
		States: []fsm.State{
			fsm.Do("A", nil),
		},
	})
	assert.With(ctx).ThatError(err).HasMessage("Invalid initial state B")
}

type stateMethodTester struct{ got interface{} }

func (m *stateMethodTester) A(ctx log.Context) error { m.got = fsm.Get(ctx).State(); return nil }
func (m *stateMethodTester) Bad()                    {}

func TestStateMethod(t *testing.T) {
	ctx := assert.Context(t)
	m := &stateMethodTester{}
	err := fsm.RunWith(ctx, m, fsm.MustCompile(fsm.FSM{
		States: []fsm.State{
			fsm.Method("A"),
			fsm.Exit("Done"),
		},
		Transitions: []fsm.Transition{
			{From: "A", To: "Done"},
		},
	}))
	assert.With(ctx).ThatError(err).Succeeded()
	assert.For(ctx, "result").That(m.got).Equals("A")
}

func TestInvalidStateMethodName(t *testing.T) {
	ctx := assert.Context(t)
	m := &stateMethodTester{}
	err := fsm.RunWith(ctx, m, fsm.MustCompile(fsm.FSM{
		States: []fsm.State{
			fsm.Method("B"),
		},
	}))
	assert.With(ctx).ThatError(err).HasMessage("Error:No such method")
}

func TestInvalidStateMethodSignature(t *testing.T) {
	ctx := assert.Context(t)
	m := &stateMethodTester{}
	err := fsm.RunWith(ctx, m, fsm.MustCompile(fsm.FSM{
		States: []fsm.State{
			fsm.Method("Bad"),
		},
	}))
	assert.With(ctx).ThatError(err).HasMessage("Error:Invalid signature")
}