AUTH-2588 add DoH to service mode

overwatch/manager_test.go

@@ -0,0 +1,74 @@
+package overwatch
+
+import (
+	"crypto/md5"
+	"errors"
+	"fmt"
+	"io"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type mockService struct {
+	serviceName string
+	serviceType string
+	runError    error
+}
+
+func (s *mockService) Name() string {
+	return s.serviceName
+}
+
+func (s *mockService) Type() string {
+	return s.serviceType
+}
+
+func (s *mockService) Hash() string {
+	h := md5.New()
+	io.WriteString(h, s.serviceName)
+	io.WriteString(h, s.serviceType)
+	return fmt.Sprintf("%x", h.Sum(nil))
+}
+
+func (s *mockService) Shutdown() {
+}
+
+func (s *mockService) Run() error {
+	return s.runError
+}
+
+func TestManagerAddAndRemove(t *testing.T) {
+	m := NewAppManager(nil)
+
+	first := &mockService{serviceName: "first", serviceType: "mock"}
+	second := &mockService{serviceName: "second", serviceType: "mock"}
+	m.Add(first)
+	m.Add(second)
+	assert.Len(t, m.Services(), 2, "expected 2 services in the list")
+
+	m.Remove(first.Name())
+	services := m.Services()
+	assert.Len(t, services, 1, "expected 1 service in the list")
+	assert.Equal(t, second.Hash(), services[0].Hash(), "hashes should match. Wrong service was removed")
+}
+
+func TestManagerDuplicate(t *testing.T) {
+	m := NewAppManager(nil)
+
+	first := &mockService{serviceName: "first", serviceType: "mock"}
+	m.Add(first)
+	m.Add(first)
+	assert.Len(t, m.Services(), 1, "expected 1 service in the list")
+}
+
+func TestManagerErrorChannel(t *testing.T) {
+	errChan := make(chan error)
+	m := NewAppManager(errChan)
+
+	err := errors.New("test error")
+	first := &mockService{serviceName: "first", serviceType: "mock", runError: err}
+	m.Add(first)
+	respErr := <-errChan
+	assert.Equal(t, err, respErr, "errors don't match")
+}