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)
 }

mocks_test.go

@@ -50,7 +50,7 @@ func TestMock_Check(t *testing.T) {
 			name:   "different",
 			fields: fields{Logged: []string{"same"}},
 			args:   args{wantLogged: []string{"different"}},
-			want:   []string{"\n\tError Trace:\tmocks.go:63\n\t            \t\t\t\tmocks_test.go:63\n\tError:      \tNot equal: \n\t            \texpected: []string{\"different\"}\n\t            \tactual  : []string{\"same\"}\n\t            \t\n\t            \tDiff:\n\t            \t--- Expected\n\t            \t+++ Actual\n\t            \t@@ -1,3 +1,3 @@\n\t            \t ([]string) (len=1) {\n\t            \t- (string) (len=9) \"different\"\n\t            \t+ (string) (len=4) \"same\"\n\t            \t }\n\tTest:       \t\n"},
+			want:   []string{"\n\tError Trace:\tmocks.go:67\n\t            \t\t\t\tmocks_test.go:63\n\tError:      \tNot equal: \n\t            \texpected: []string{\"different\"}\n\t            \tactual  : []string{\"same\"}\n\t            \t\n\t            \tDiff:\n\t            \t--- Expected\n\t            \t+++ Actual\n\t            \t@@ -1,3 +1,3 @@\n\t            \t ([]string) (len=1) {\n\t            \t- (string) (len=9) \"different\"\n\t            \t+ (string) (len=4) \"same\"\n\t            \t }\n\tTest:       \t\n"},
 		},
 	}
 	for _, tt := range tests {
@@ -68,7 +68,7 @@ func TestMock_Check(t *testing.T) {
 
 func TestNew(t *testing.T) {
 	logger := New()
-	logger.Logger.Info("logging")
+	logger.Info("logging")
 	logger.Check(t, []string{"info: logging"})
 }