chore: inline log.Interface and handle empty and nil slices the same

mocks.go

@@ -31,7 +31,7 @@ import (
 // Mock has a Logger for use in unit-testing
 type Mock struct {
 	*sync.RWMutex
-	Logger log.Interface
+	log.Interface
 	Logged []string
 }
 
@@ -48,8 +48,9 @@ var _ log.Handler = &Mock{}
 // New instantiates a new Mock and sets the log.Handler to it
 func New() *Mock {
 	mock := &Mock{
-		RWMutex: &sync.RWMutex{},
-		Logger:  log.Log,
+		RWMutex:   &sync.RWMutex{},
+		Interface: log.Log,
+		Logged:    make([]string, 0),
 	}
 	log.SetHandler(mock)
 	return mock
@@ -60,5 +61,8 @@ func (m *Mock) Check(t testing.TB, wantLogged []string) {
 	t.Helper()
 	m.RLock()
 	defer m.RUnlock()
+	if wantLogged == nil {
+		wantLogged = []string{}
+	}
 	assert.Equal(t, wantLogged, m.Logged)
 }