Start to refactor config to support new version of configuration with multiple watchers.

config/config_test.go

@@ -0,0 +1,60 @@
+package config
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+func TestNoConfig(t *testing.T) {
+	if Config.Version != 0 {
+		t.Error("not 0 empty config")
+	}
+
+	configPath = emptyTempFile()
+	os.Remove(configPath)
+
+	err := LoadOrInit()
+	if err != nil {
+		t.Errorf("unexpected failure from load: %s", err)
+	}
+
+	if Config.Version != 2 {
+		t.Error("not version 2 starting config")
+	}
+
+	if fileSize(configPath) < 40 {
+		t.Errorf("File is too small %d bytes", fileSize(configPath))
+	}
+
+	os.Remove(configPath)
+}
+
+func TestEmptyFileConfig(t *testing.T) {
+
+	configPath = emptyTempFile()
+
+	err := LoadOrInit()
+	if err == nil {
+		t.Error("unexpected success from LoadOrInit()")
+	}
+
+	os.Remove(configPath)
+}
+
+func emptyTempFile() string {
+	f, err := ioutil.TempFile("", "dautest-*")
+	if err != nil {
+		panic(err)
+	}
+	return f.Name()
+}
+
+func fileSize(file string) int {
+	fi, err := os.Stat(file)
+	if err != nil {
+		panic(err)
+	}
+	return int(fi.Size())
+
+}