Add tests.

service/service_test.go

@@ -0,0 +1,111 @@
+package service
+
+import (
+	"fmt"
+	"os"
+	"testing"
+	"time"
+)
+
+func TestService(t *testing.T) {
+	svc, err := NewService([]string{"sleep", "2"})
+	if err != nil {
+		t.Errorf("NewService => error{%s}, wanted Service", err)
+		return
+	}
+
+	pid := svc.Pid()
+	if svc.Pid() != 0 {
+		t.Errorf("svc.Pid() => %d wanted 0", pid)
+	}
+
+	commands := make(chan Command)
+	responses := make(chan Response)
+	events := make(chan Event)
+
+	processRunning := func() bool {
+		pid := svc.Pid()
+		if pid == 0 {
+			return false
+		}
+		file := fmt.Sprintf("/proc/%d/stat", pid)
+		if _, err := os.Stat(file); os.IsNotExist(err) {
+			return false
+		}
+		return true
+	}
+
+	verifyStates := func(states []string) {
+		for _, state := range states {
+			event := <-events
+			if event.Service != svc {
+				t.Errorf("event.Service => invalid service pointer")
+			}
+			if event.State != state {
+				t.Errorf("event.State => %s, wanted %s", event.State, state)
+			}
+			if !processRunning() && event.State == Running {
+				t.Errorf("svc.Pid() => not running, should be running")
+			} else if processRunning() && (event.State == Stopped || event.State == Exited) {
+				t.Errorf("svc.Pid() => running, should not be running")
+			}
+		}
+	}
+
+	verifyCommand := func(command string, states []string, success bool) {
+		commands <- Command{command, responses}
+		verifyStates(states)
+
+		response := <-responses
+		if response.Name != command {
+			t.Errorf("response.Name => %s, wanted %s", response.Name, command)
+		}
+		if response.Success() != success {
+			t.Errorf("response.Success() => %t, wanted %t, error{%s}", response.Success(), success, response.Error)
+		}
+
+		if len(states) > 0 {
+			state := states[len(states)-1]
+			if response.Error == nil && (state == Exited || state == Backoff) {
+				t.Errorf("response.Error => nil, wanted ExitError")
+			}
+		}
+	}
+
+	// Not Running on Run() and Shutdown works without a Start.
+	go svc.Run(commands, events)
+	verifyCommand(Stop, []string{}, false)
+	verifyCommand(Shutdown, []string{}, true)
+
+	// Start works properly and Shutdown works when Running.
+	go svc.Run(commands, events)
+	verifyCommand(Start, []string{Starting, Running}, true)
+	verifyCommand(Start, []string{}, false)
+	verifyCommand(Shutdown, []string{Stopping, Stopped}, true)
+
+	// Stop works properly and Shutdown works after Stopped.
+	go svc.Run(commands, events)
+	verifyCommand(Start, []string{Starting, Running}, true)
+	verifyCommand(Stop, []string{Stopping, Stopped}, true)
+	verifyCommand(Shutdown, []string{}, true)
+
+	// Receives Exited and restarts.
+	go svc.Run(commands, events)
+	verifyCommand(Start, []string{Starting, Running}, true)
+	verifyStates([]string{Exited, Starting, Running})
+	verifyCommand(Shutdown, []string{Stopping, Stopped}, true)
+
+	// Receives Exited and Shutdown works after Exited.
+	svc.StopRestart = false
+	go svc.Run(commands, events)
+	verifyCommand(Start, []string{Starting, Running}, true)
+	verifyStates([]string{Exited})
+	verifyCommand(Shutdown, []string{}, true)
+
+	// Received Backoff and Shutdown works after Backoff.
+	svc.StartTimeout = 3 * time.Second
+	go svc.Run(commands, events)
+	verifyCommand(Start, []string{Starting, Backoff, Starting, Backoff, Starting, Backoff, Starting, Exited}, false)
+	verifyCommand(Shutdown, []string{}, true)
+	svc.StartTimeout = 1 * time.Second
+}